Rokinon/Samyang 135mm discussion

[verbal quail]

I'm using an imx571 color

[verbal quail]

What stop should I shoot at?

Also how do you keep track of what stop you're on when it's in the tube rings?

[solid raptor]

I don't know but 20-30 seems too long. Someone else should answer, never had cs when comet was out

[solid raptor]

If you really can't see it, I'd just click down to 2.0 and count manually

[verbal quail]

Is every tick the next stop? like 2.0, 2.8, 4.0, 5.6 etc

[solid raptor]

No, there's half stops

[verbal quail]

So from F2, it's 2 ticks to F2.8, then 2 ticks to F4?

[solid raptor]

Yeah

[verbal quail]

Thanks!

[solid raptor]

Yw

[verbal quail]

Anyone else get weird gradients while processing with PI?

My other telescopes don't do this. Is this just a quirk of the lens? If so what kind of calibration frame do I need for this?

[leaden pumice]

I had something similar but using Siril and DSS. I tested by stacking in both and both came out like that. However, I was able to kind of hide it when stretching in siril.

[verbal quail]

Flat frames are the solution. Image is perfect now.

[gaunt scroll]

what should I shoot, I live in Brasov

[leaden pumice]

Anyone here use the 2600mc pro with the rokinon?

[grave marten]

Ofc

[leaden pumice]

Awesome! What filters would you recommend (or anyone else) with that set up?

[solid raptor]

UV/IR cut Filter depends on how well corrected your copy is but ideally astronomik L3 or Baader UV/IR cut. DNB Filter IDAS NBZ (cheaper) and Antlia ALP-T highspeed

I prefer the IDAS though

[grave marten]

I use same filters as with any other lens/ota. Depending on target. 2600MC-Pro has built in uv/ir cut filter, so I typically run a nakid sensor for broadband targets and whatever narrowband filter for emission targets. I have good results with the Antlia ALP-T 5nm Duoband Ha/OIII and the IDAS NBZ filter.

[leaden pumice]

Thank you guys! I’m assuming you guys use a filter drawer with this set up?

[grave marten]

Yessir. Or filter wheel for mono 💪

[grave marten]

Zwo makes an EOS adapter with built in filter drawer.

[leaden pumice]

Thank you guys so much! My setup is about to get a huge upgrade!

Any other rings or adapters I need to get to add everything to the rokinon? With the filter drawer

[grave marten]

Rock'n On 135 with 2600MC-Pro (no filter). 💪

[leaden pumice]

Woah, I really did not have any expectations for this setup

[grave marten]

Bhatanov mask is really helpful for focusing, a 3d printed ring system for mounting is useful

[leaden pumice]

Got both of those already! Perfect!

[grave marten]

Nice. Should be gtg

[leaden pumice]

Great! I’ll keep you guys updated once I receive everything. I appreciate the help and recommendations!!!

[grave marten]

Stars (usually) get pretty abberated wide open at f/2. Stopping down to 2.8 to 4.0 yield decent results for many people.

[leaden pumice]

I’ve been testing f4 with my dslr, got better images than f2.8

[leaden pumice]

Am I looking at the right IDAS NBZ filter here? https://agenaastro.com/idas-nbz-ii-high-speed-imaging-filter-2-inch-mounted-m48.html

[chilly ingot]

ye looks like its the new version. really good quality filters

no halo's and will work even wide open with the roki

and yes the ZWO filter drawer for canon lenses is the best

If you are in a really really lightpolluted area, the Antlia alp-t highspeed is better.

[leaden pumice]

Awesome, thank you!

[leaden pumice]

Is the filter drawer enough to reach back focus with the 2600 mc? I thought I’d need more spacers but then I saw Scotia use the filter drawer https://youtu.be/o5yBMHYUF1U?si=fhJgZeFqIDPi8Mh7

[grave marten]

It's enough. Backspace is 44mm. 2600MC-Pro flange to sensor is 17.5, EOS filter drawer is 26.5mm. This is exactly 44mm.

If you use a smaller camera (294,533 etc) with a flange to sensor distance of 6.5mm then you'll add an additional 11mm spacer.

[toxic marsh]

Okay this is a good place to talk about camera and lens

[leaden pumice]

Alright perfect! Thank you!!! New camera is on the way!

[solid raptor]

What filter did you decide for?

[leaden pumice]

This one https://agenaastro.com/idas-nbz-ii-high-speed-imaging-filter-2-inch-mounted-m48.html

[solid raptor]

Good choice

[leaden pumice]

How can you tell if you have a bad copy of the rokinon?

[leaden pumice]

im starting to think mine might be faulty with these rings and vignetting even after calibration frames, what do you guys think?

[dire flicker]

Looks like bad flatus

Flats

[old goblet]

reflections from the dew shield could cause those rings iirc

or just bad flats

[leaden pumice]

How could I rule out flats? Other than taking good flats, it seems like I can’t take good flats lol

[old goblet]

did you have any dew on the optics when taking flats?

you could also just stack without flats and see if the ring is still there

[leaden pumice]

That’s the one I have on.

[old goblet]

probably not dew then ig

welp, im just gonna take a guess and say its reflections from the dew shield then, you can stick some matte fabric type of stuff in there or just paint it with some matte paint so it doesnt reflect

[leaden pumice]

I’ll give it a shot and put some fabric in there. Thank you

[grave marten]

did you take bias frames to calibrate the flats?

[leaden pumice]

Yes, I have tried dark flats and regular biases. I am definitely getting different results with different flats. But it’s either a smaller ring or a bigger ring

[leaden pumice]

What do you guys think? 48 180S guided, asi2600MC PRO - I feel like it should be better https://drive.google.com/file/d/1BXtmuAnSzpKtVqc6GH7zcI7tEOiVrVMS/view?usp=sharing

[grave marten]

Share your raw stack

[leaden pumice]

Here ya go. https://drive.google.com/file/d/1G3pwp5UyOh420syNKYPSGnds1GXgX3lR/view?usp=sharing

[grave marten]

I'll take a peek when I am home

[leaden pumice]

Thank you!!!!

[grave marten]

So yeah...there is signal in there. But its a bit beat up. I feel like maybe needs better flats, needs better data culling (choose only the best frames). There is aberration, but it can be (mostly) corrected.

you have some blotchy area which can be maybe hi clouds passing through the frame and diminishing the stack

[leaden pumice]

Oh wow! That still does not look as bad as my process, what software are you using?

I am going to restart the whole process, get new data and new calibration frames. Hopefully that will fix all my issues. I’m starting to think I might’ve changed something between my lights and calibration frames.

[grave marten]

and I guess depending on bortle zone, this looks like it can be about what to be expected without a narrowband filter

I just ran it in Pixinsight

[leaden pumice]

It has to be clouds, I went through my Orion Nebula data last night and saw a whole bunch of subs had clouds in them. I’m in bortle 4 but these were taken during a full moon

[hazy copper]

So it’s closer to a bortle 6-7. Wait for new moon. You will cook.

It’s just standard light pollution gradients

[leaden pumice]

The moon doesn’t come up until about 11-12 midnight tonight, and it gets dark at 6. I should have really good pictures in the morning

[hazy copper]

Clouds aren’t helping though, what does your rejection high map look like, assuming you stacked in wbpp? Or did you use siril?

[leaden pumice]

These were all in Siril

I believe I used the sirilic version

[grave marten]

a few years ago I ran the 2600 and rokinon on elephants trunk with about double the data (150 x 180s) the colors and dark nebula etc...kinda seems to fit in with your data profile

so id say your right on track

[leaden pumice]

That is amazing!!!!

[grave marten]

just keep on doing what your doing, get that experience in, understand your data and what your asking from it and keep running your processing to get experience in that area

[leaden pumice]

Thank you!! I am super excited to test tonight, definitely need to pay more attention to calibration frames. That definitely messed with me, but I think I’ll have it down tonight

[grave marten]

abberation inspection before and after correction

it cleans up well

[leaden pumice]

How do you correct it?

[grave marten]

but stepping down can improve this

[grave marten]

blurxterminator

[leaden pumice]

I’ve been shooting at 2.8 I think it is? I might go down to 4 tonight

[grave marten]

f/4 is usually pretty good

[leaden pumice]

I’ll do that and I’ll try to find a good target to hopefully test after collecting an hour or so of data

[grave marten]

find a target and stay on it if you can. an hr is ok...but I mean, more data is always better

lots of cool area to point at

m45 (Pleiades) looks great at 135, you got the north star ifn, you have the wolf cave region

[leaden pumice]

Hmmm, I’ll probably just be patient and finish off in the morning. I could do about 4 hours of m45 and then switch to m42 maybe

[grave marten]

all broadband, so no filters needed there

[leaden pumice]

Perfect! Do you mess with the offset? I have it at 50 and I have no idea if I should change it or not

[grave marten]

I run with the asiair, so we dont have those settings to mess with lol. and I use default gain

Dark Shark and friends with the 135...but this was a multi night project, ~20hr. But is cool cause its northernly, so can pretty much work on it year round.

[leaden pumice]

The details! That’s incredible!! Where do you have your collection? lol

[grave marten]

I have a few images over on AB

https://www.astrobin.com/users/Mazzif/

[leaden pumice]

Love the variety of colors!

[leaden pumice]

New data looks great! Calibration seems to have done its job https://drive.google.com/file/d/16kqEBO8KkyKJDUvt1psVIA9Bm2jleX5y/view?usp=sharing

[leaden pumice]

Might’ve over processed it, but got the calibration frames working!!

[grave marten]

looks much better, yeah

[leaden pumice]

That was well over 5 hours total. It was really exciting to process it

[grave marten]

good deal, looks like you are well on your way now

[leaden pumice]

Thanks to all the help I got from you and others! Now I’ve got cloudy night for the next 7 nights 😩

[gaunt scroll]

nice, but it's a bit undersaturated

[grave marten]

Better than over saturated

[leaden pumice]

About 2 hours worth!

[grave marten]

Coming along nicely now. Good job.

[bold acorn]

yes finally got one

[gaunt scroll]

Yay

[verbal quail]

Why does my Roki do this? This is not tilt or trailing. tilt inspection was very minor and this happened no matter what exposure time I used.

also what might be causing this shadow?

[verbal quail]

NVM, found out that's all caused by using f/2 instead of 2.8

[civic mirage]

If you want to stop down just use step down rings, will heavily reduce the diffraction spikes.

[verbal quail]

Is the black shadow a known artifact of this lens at f/2 or is that something in my imaging train?

[civic mirage]

I've seen that on other roki's yea

I believe it's common

Lenses in general have similar diffraction spikes

[solid raptor]

Some Takahashis have it as well

[slow tinsel]

i have it too

[verbal quail]

Glad I'm not the only one.

Are your stars triangular at all?

[verbal quail]

I had subarcsecond guiding here.

[slow tinsel]

i think edge ones have some coma at f/2

but i dont have any subs or anything non-blurxed on my phone

[verbal quail]

I'll have to try 2.8 some time for a comparison.

[solid raptor]

You can also try 2,4

[verbal quail]

How do you do that?

[solid raptor]

The click between 2,0 and 2,8

[verbal quail]

Ah, I feel dumb! Forgot there was a tick between 2 and 2.8!

[solid raptor]

You're not the first ;)

[gaunt scroll]

there is also 2.2

[hazy copper]

On the cine version

[small scaffold]

it doesn't work that we'll, 2.8 gets you the sharpest stars

[small scaffold]

does anyone have a model for lens collar for samyang? i want to 3d print em

[grave marten]

https://www.thingiverse.com/search?q=Rokinon+135mm&page=1

[solid raptor]

https://makerworld.com/en/models/950575

This one's also pretty cool

[grave marten]

Currently

[small scaffold]

how do you attach a dew heater?

[small scaffold]

ayoo we have the same mount

you are using what dovetail?

[grave marten]

Love my iEXOS-100 💪. And just a 3d printed dovetail

[small scaffold]

won't the dovetail break?

coz when I tried using a plastic one I heard cracking sounds

the screw was pushing into it

[grave marten]

Hasn't yet in over a year

[small scaffold]

the dovetail is included in this?

also where do you put a dew heater? coz the part where its supposed to go is not accesable due to the rings right

[grave marten]

Enough room for the strap

[solid raptor]

Don't think so

[solid raptor]

The strap? Around the dew shield

[small scaffold]

oh ok thanks

[small scaffold]

can you send me a photo of your dovetail and where ypu got it from?

[grave marten]

Came with the kit

https://www.etsy.com/listing/1266065139/hyperpod-135-lens-mounting-system-for?click_key=f2e55e7277655c618eddcad683e027403f25f8b7%3A1266065139&click_sum=e58b1f3b&ref=shop_home_feat_1&pro=1&sts=1

[split willow]

I think our rigs might be related

[verbal quail]

Cable management is proving to be real annoying on my rokinon rig. my dew strips have 6 feet of wire even though my powerbox is like 2 inches away.

[grave marten]

Looking good. What camera and filters are you pairing?

[split willow]

2600MM Pro with Astronomik Filters

[grave marten]

Dope. I'm not sure what camera yet myself...either 294MM-Pro or 1600MM-Pro. Both are petty similar.

[split willow]

I‘ve previously used the Rokinon with my 1600MM, and the combo doesn’t disappoint.

[grave marten]

I'm sure either will deliver. Just need some clear skies. Astro Drought continues into 2025. 😭

[split willow]

Feel ya, had a grand total of 11 clear nights across 2024

[hazy copper]

Get a Ares M or something. IMX533 is a much nicer sensor, if i had to pick between your options it might be the 1600m

The 294 is a pain in the ass to work with.
The 1600 is just old and not very sensitive but the calibration issues arent as bad.

[grave marten]

Why get when I Ready have.

[grave marten]

I run 3 294s without issue.

[hazy copper]

The 294 is a downgrade from a 533.

[grave marten]

Laughs in 47MP.

[cosmic marlin]

🎇

[verbal quail]

Should I get an autofocuser if I'm using OSC and not changing filters?

[cosmic marlin]

ya

[leaden pumice]

I’ve been using a bahtinov mask and haven’t had any issues even though I keep it out for 6-8 hours a night. I found someone local to 3d print the mask for $20

[verbal quail]

I got a mask for mine. You say yours stays focused for 8 hours?

[leaden pumice]

Yes, I check focus throughout the night but as long as I have the dew heater on “medium” I’m all good. Temperature drops down to 35 for me so it messes with the focus if I don’t have the dew heater on medium.

If I don’t mess with it, I usually don’t have to correct the focus for a few nights actually. But I still check with the mask at the beginning of each session.

[verbal quail]

So as long as you got a dew heater you don't really need to refocus?

Also I'm using an IMX571 camera. Big sensor. Needs and m48 for no vignetting, but the ZWO to canon filter drawer is only in m42. Is there a way to get an M48 version so I don't need flats for vignetting?

[leaden pumice]

Yes at least from my experience and my set up

[leaden pumice]

I have the same sensor (ASI2600mc pro) and I use flats and dark flats. I have a darks library and I use them even though I don’t need to. But you do need to use flats. I use a white shirt, point it to the light fixture in a room, and use Nina flat wizard.

I struggled to get the flats right for the exact sensor. Here’s bad flats after background extraction and good flats after background extraction

[verbal quail]

I have a way to take flats, I just wouldn't have to if there was an m48 for the canon adapter.

[leaden pumice]

Is your rokinon for a canon?

[verbal quail]

yeah

But here's the thing, I do regular photography too, so sometimes that lens comes out of the rig if I need to use it as an actual 135mm lens.

So I'm not taking the back off.

[leaden pumice]

This is how I have mine I use the filter drawer from Zwo and it was actually recommended by someone else here and it’s perfectly fine. I reach back focus with and without the filter in the filter drawer.

https://www.highpointscientific.com/zwo-filter-drawer-for-eos-lens-fd-eos

You can take the lens off within 30 seconds

[grave marten]

https://www.firstlightoptics.com/adapters/astro-essentials-samyang-lens-to-m48-adapter.html

[verbal quail]

Can't really do that 😦

[civic mirage]

The 294mm is def better than the 1600mm

[verbal quail]

I got exactly this, I just need one that has an m48 to begin with instead of an m42 that I have to step up to m48

Or I could just buy a flat panel and stop whining about vignettes and imaging circles.

[grave marten]

I've always done sky flats. No problem.

[slow tinsel]

don't u have it tho?

[grave marten]

1600mm is dope cause you can get it for ~400$ on the used market, takes 1.25" filters. So cost to performance ratio is off the charts.

[civic mirage]

This

@slow tinsel But if you can find a 294mm for 600 I'd likely take it over a 1600mm.

If I hadn't bought the 1600mm yet

And was just starting to use mono

[grave marten]

I have seen the 294mm for ~600 but its rare. It is regularly found in the 800-850 zone. It can still use 1.25" filter with a touch of vignetting (corrected with flats). I just cant get into the fov of the 533 (personal pref) so I dont follow its 2nd hand pricing, but a quick glance shows it being all over the place with ~800 seeming to fall in the middle. 294 is one of my favorite sensors, but Id still say the 1600mm is the bang for buck champion.

[solid raptor]

I've personally really grown fond of the square format but yeah it's too small

I wish there were some sensors of the newest generation that filled the gap between 533 and 571. This way we only have the older generation sensors

[grave marten]

A new MFT sensor with Starvis II would be an instant buy for me.

[solid raptor]

Yep

[civic mirage]

This is what I've been saying, imagine something in between the 294's bin2 and bin1 resolution and backlit - no microlensing - and well depth matching the latest sensors... Would be neat to see that.

[grave marten]

Itll never happen though, because Sony.

[split willow]

Will it fit on the Rokinon? Moravian G3-11000C Edition.

[civic mirage]

Color CCD?

[hazy copper]

Mono I am fairly sure

But still ☠️

[split willow]

Haha

[split willow]

Can‘t really find a full frame sensor with equally big pixels in the same price class

so you kinda have to compromice

[civic mirage]

Ahh thought C was color possibly

[civic mirage]

Larger pixels do best with high focal lengths

Are you actually gonna use it with the Roki? 💀

[split willow]

No, that was just a joke. I‘ll put it onto a 10“ RC.

[verbal quail]

I got a big ol' SBIG 8300m that I seriously considered putting on my roki.

Only thing that stopped me was the canon ef adapter being ~$270

[split willow]

Just out of curiosity I think I‘m gonna put it on there at least once, even though it‘ll get pretty much square stars

[thorny jetty]

what r ur eaf settings

[split willow]

Backfocus 100, step size 20

[thorny jetty]

will try next clear night, thank you!

[small scaffold]

2 processing attempts

open to suggestions

[slow tinsel]

orion area has MGC data, do u own pixinsight?

[small scaffold]

no sadly, what is mgc?

[slow tinsel]

multiscale gradient correction

ur data has badly corrected background, if u had pixinsight, mgc would be able to fix it

[small scaffold]

oo

yeah ia gree

all of my images have random splotches of colors aswell in the background

shouldi share the data ans someone could do it?

[slow tinsel]

i guess so, is your data good tho?

[small scaffold]

yeah

I think so

[slow tinsel]

i would get the image finished in terms of acquisition before asking processing favour

[small scaffold]

I won't be able to add more data anytime soon

so I might aswell process and finish it up

[elfin nimbus]

First 11 minutes on Orion last night with the roki. It's so cold out here in MI it's been hard to get data

[verbal quail]

Is this with a DSLR?

[small scaffold]

yup

[verbal quail]

You captured a good amount of Hydrogen up by the horsehead for a DSLR

[elfin nimbus]

Up to 33 minutes of data now and fixed my guiding + dithering setup

[small scaffold]

guys asi 585 mc pro with rokinon should be a good combination?

[split willow]

yeah, I‘d say so.

[solid raptor]

A minicam8 would probably be a better choice. Very budget-friendly mono option and same sensor

[small scaffold]

Will I be able to attach the roki to it?

[solid raptor]

Yes

With the fitting adapters

[grave marten]

It might be tricky though. The minicam8 will consume ~31mm of back space leaving only 13mm left to play with until you reach 44mm. The minicam8 uses a a C to m48 adapter and I don't know how many mm that is. You may also need to remove the original bayonet from the Rokinon and install an m48 direct thread bayonet because even the zwo short EOS adapter is 17.5mm.

[solid raptor]

Yeah you'll need to replace the bayonet. It's not too expensive though

[grave marten]

Lightweight Mono Rock'n On 135 is all set up and gtg.

[chilly ingot]

qhy sells short ef bayonets for filterwheel fits

[grave marten]

Although I have a dark "filter" in place, Wondering if I don't want to swap it out for ir pass.

[grave marten]

Still 10mm and just visually, the C to m48 looks much more than 3mm.

[grave marten]

All set.

[cosmic marlin]

that looks sick

red and black best colours that go together

[grave marten]

Just a handful of subs, 1h 9m total exposure time. The swsa2i has happy with 180s exposures.

[small scaffold]

man that's soo good, what camera? i might buy a cam and I don't hav emuch hopes for the mono coz its hard to setup with roki and risky, I might opt for a standard cam from zwo

which one you got?

[grave marten]

1600mm and svbony 5nm SHO. Easy as anything else to setup actually. Short EOS adapter and EFW.

[small scaffold]

oo

what are your opinions on the 585mc pro

[grave marten]

Capable sensor. I have a color non cooled. I don't use it much but I don't have anything against it

I went with the the 1600 because they are so cheap used and I was putting together a kit as low cost as possible lol.

[civic mirage]

1600 is def capable as mazzif said, mine is still going strong.

[small scaffold]

what are some cool galaxies i can shoot with thw roki and an apsc chip now? i have done pinwheel, bodes, markarians, leo

[split willow]

m31, M33, M101, LMC, Leo Triplet, (M51 maybe)

[grave marten]

remembering why I like the Rokin'On 135...
18 minutes of Ha

[small scaffold]

yeahh, I think i should get the qhy minicam 8 and figure out how to put a roki on it

[grave marten]

all 2nd hand, this kit cost me about the same as the minicam8, but ill have the flexibility to change sensor

except for the filters, bought those new, but super affordable

[grave marten]

almost 4h of Ha data

[small scaffold]

sheesh that's insane

iw the coma cluster worth it with the roki and apsc chip?

[uneven heart]

Im also on a 1600 and i wont upgrade until we get a suitable replacement for it. the 249 is trash

[grave marten]

Both are 4hr Ha. One is star aligned and croped down to match the other. One is Chroma 3nm Ha, Other is Astrodon 5nm Ha. One is 1600mm Other is 294mm. Apparently, one is 'trash' lmao

[civic mirage]

The only camera that is trash is the one you pay too much for.

[bold acorn]

wow that's alot of details

[chilly ingot]

but but. The 100s cheapest ever

[grave marten]

Picked up a GTi for the Rock'n On for cheap. It will be a permanent widefield kit now.

[solid raptor]

Are you discarding the iexos?

[grave marten]

Oh no way. My Sharpstar 61 and z81 ride on that regularly.

In fact, just didn't want to dismount from the iEXOS just to run the Rokinon

[solid raptor]

Wow isn't the z81 too big for it to handle?

[grave marten]

Nope

[solid raptor]

The sturdy tripod definitely helps

[grave marten]

My buddy abuses his pretty bad

[solid raptor]

And here are my current Roki Ha WIPs because why not. Need a ton more int on ALL of them

[grave marten]

Yeah I was just saying I want to run the Rokinon more. Gonna this year

[solid raptor]

Diabolical

[grave marten]

Such a neat focal length

[civic mirage]

Very delicious

[solid raptor]

Larger sensor would be nice xD

[solid raptor]

Thanks, the only one I hope to finish this spring is the Orion one though...

[solid raptor]

Also you are considerably less busy during galaxy season

[grave marten]

I have considerably better weather 😁

[solid raptor]

I'm sure 😀

[grave marten]

Maybe not. I dunno. Summer is better weather but shorter nights

Maybe only 3 or 4 hr of imagaging time

A night

[civic mirage]

Gonna run the noot on some galaxies mazzif?

[solid raptor]

Yeah cant really beat winter nights but sitting outside with a t-shirt is pretty neat (except fot the mosquitos)

[civic mirage]

That's... Rough ash.

[grave marten]

Or the 151PHQ

[civic mirage]

Would be dope for Leo trio or marks chain

If only my seeing stays like this or somewhere close

Would love to go after this guy

[bold acorn]

does that work well?

[bold acorn]

no way that's a roki

[civic mirage]

Oh nah it isn't

We were talking about newts for a min there

[bold acorn]

oh right

I didn't see diffraction spikes so idk i got confused

[grave marten]

If it was cropped out a bit more then there's a fairly bright star that would have spikes. But otherwise yeah M1 doesn't produce many diffraction spikes for me either

[split willow]

that looks hella clean! would love to have a go at the data when you‘re finished.

[solid raptor]

Yeah sure! I'll send it to your grandchildren when it's finished

[split willow]

Send it directly to my great-grandchildren man, I know the weather in germany.

[solid raptor]

Haha. I might finish the Orion project before the white nights but the other ones probably in Autumn

[spark wraith]

No way that's insane
I've seen people criticising it even while being under its payload capacity

Is that the bigger version?

[grave marten]

No

[small scaffold]

yeah, i was hesistant at buying it first coz onine people dont like this mount, but when i saw people on this server abusing it i got it instantly.

[small scaffold]

there are direct, C to nikon F mount adapters available, can use that too right?

[grave marten]

https://agenaastro.com/catalog/product/view/id/2229/s/baader-c-mount-nikon-2958535/?gQT=1

32mm tho

maybe this tho
https://www.amazon.com/Fotodiox-Adapter-C-Mount-Nikon-F-Mount/dp/B003EB14IY

[small scaffold]

how much spacing do I need?

maybe I can 3d print it

[grave marten]

not sure...youll have to do your own research. I dont use F mount lenses

but the minicam8 consumes ~31mm alone

quick search shows me Nikon F mount DSLRs is 46.5 mm. So subtract the 31mm of the MC8, leaves 15.5mm to make up with spacers and adapters

[small scaffold]

okay thx

[grave marten]

for a little more flexabillity, Touptek offering up a combo mono 585 deal

https://www.touptekastro.com/products/atr585m?variant=49714669224248

[solid raptor]

I'd probably immediately sell the cam and get a 533

Even though the extra resolution and NIR sensitivity are nice

[small scaffold]

damn thanks, thats so good

i might just get that, and 3d print an adapter to connect roki with it

[small scaffold]

why tho?

i really think thats a good deal to get into mono isnt it?

with the qhy minicam 8, the adapters are weird and teh filters cant be upgraded later

[solid raptor]

Yeah it is. One reason is that it's upgradeable and the price difference between a 585 and 533 isn't that big

[crimson goblet]

FOr how much do you think the cam sells?

[solid raptor]

At least 500€. I got my 533 mono new for 620€ incl. shipping so not that great of a difference. But the 585 is a perfectly capable sensor as well so everyone's personal choice

[grave marten]

Just some test Ha data with the 1600mm riding on the GTi pulling 300s unguided. Performance was pretty poor but it cleaned up OK.

[grave marten]

Seeing was 💩 last night. Very windy. I ran the Rokinon kit anyway till the clouds rolled in. Got about 4 hours of data total on SH2-273 (Cone Nebula/Christmas Tree region). If you pixel peep, also poor data. But its w/e.

[grave marten]

Gonna move the Rokinon kit from the GTi to the iEXOS for superior performance.

[grave marten]

This is the way

[grave marten]

33 minute exposures. Made 3 of them. Each used a different f stop (2.0, 2.8, 4.0). Stacked

[slow tinsel]

really good stuff

use msgr if you can though

contrast around m42 is ass

[grave marten]

It's ass data 🤷
Was more an exercise for me to look at star shapes in f/2, 2.8 and 4. It's only 3 frames. Conditions were not really good for much more than testing.

[slow tinsel]

wtf thats 3 frames??

u should do new nebula surveying

[grave marten]

Well yeah, but they are 33 minute frames

[slow tinsel]

dang wtf thats a pretty important bit of info

[grave marten]

Prolly why I said it 1st
🤷
#1059854397301063740 message

[grave marten]

Just dinking with framing. Single 10m exposure.

[solid raptor]

Juicy

[grave marten]

I'm finding the 1600mm to be a pretty effective match with the Rock'n On 135

[small scaffold]

this is what I got with the samyang 135 and stock mirrorless camera

[slow tinsel]

get it modded

[small scaffold]

I can't, thats my only camera atm

I'm saving up for a power tank so I can get to birtle 1 locations

[slow tinsel]

all of these shot on my astromodded 6d

[small scaffold]

oh, did u have it done somewhere

or do you use any external filters?

I have the nikon z50 and it's very tough to modify thode mirrorless ones

[slow tinsel]

yeah lifepixel

[small scaffold]

okay

[slow tinsel]

nope no filters at all

[small scaffold]

okay cool

I'll look into it then

[slow tinsel]

ngl i think astromod helps with regular photography too, since it increases broadband SNR by around 0.5x

and it barely affects ur light curve, nudges the cameras red-side high level transmission just a few ten nm so it covers 656

[thorny jetty]

should i cast a lead weight to put in place for my guider i dont even use?

[light rose]

I'm going to try using this vintage Access SQ 200mm lens with a Canon EOS adapter and try manual mode with a tracking mount to capture the Orion Nebula.
Has anyone tried using an old lens on a DSLR?

[uneven heart]

vic is awesome

[slow tinsel]

the 2 sunset ones are shot at cape schanck, the rest are actually new zealand!

[uneven heart]

yeah i reckognized cape schanck

[solid raptor]

8 h WIP. Shot at low altitudes and through Ramstein Airbase's light dome (thanks Americans for polluting my skies ) so could've been way better

[slow tinsel]

crazy ahh Ha

btw can u see the military flight practices from where u live? or too far

[solid raptor]

See them? I can nearly taste them

[slow tinsel]

thats kinda cool tho

id love the photography

[solid raptor]

Fighter jets I see relatively seldomly but mostly Hercules

Nice F35 though

My grandparents were at the flight show disaster, fortunately not where the planes crashed

[slow tinsel]

you mean avalon? or a different accident

[solid raptor]

https://youtu.be/0R6CDDIY2H0?si=TyWKLn5nyya3JU7M

[nocturne pagoda]

Running chicken is my newest one, great lens other than the fact that sometimes you get bad copies

I have to stop mine down to F4 to get decent performance, even then I get fringing and coma

[elfin nimbus]

roki does great on orion but the other ones look better here 🙂

[lost swallow]

Thats at f 2.8

[leaden pumice]

What camera did you use? Any filters?

[lost swallow]

No filters and a ha modded Canon 70d

bortle 4

[leaden pumice]

Nice! Awesome picture!!

[lost swallow]

Thanks

[nocturne pagoda]

leGOON

imx585

[split willow]

Prolly the first roki with a caa installed onto it

one shall ask why and I may answer with lazy

[civic mirage]

Why not wanderer astro rotator?

[split willow]

asiair useability (we wont talk about the uranus c)

[civic mirage]

Lol

Nina superiority

[split willow]

Definitely but its just a little simpler for the go. The main setup uses NINA of course 😉

[civic mirage]

Fair

[coarse quiver]

Hello All, I see here are a lot of experienced people a special with usage of Rokinon 135mm/f2 lens. Can you give me some open feedback about photos I attached, it was taken with mentioned Rokinon lens and total exposure time is 3h aperture at f2.0.

What do you think about star shapes, tracking accuracy and processing? 🙏

[nocturne pagoda]

Rly good star shapes for a roki! You got very lucky, theres some star trailing so you might wanna lower ur exposure time

Id do anything to switch rokis

[coarse quiver]

Hm, I think my star shapes affected by camera - accuracy of tracking, but I will not be able to improve it without going to real external star tracker. I'm using just tripod, Pentax K1-I and Rok135mmf2.0. Stars are tracked by camera it self, function called Astrotracer Type3. Camera take initial exposure, will analyse star trails in that image and then for all next exposures it will rotate,move to sides sensor to compensate the trailing. My standard exposure with it 30 sec and 12 shots. Maybe can reduce to 20 seconds.

Btw why you just do not sell your bad copy and buy other. You can buy new from few different webs and chose 1 best from few and next return to shop...

[nocturne pagoda]

dont rly want to, my roki is very much usable js saying it cant compare to your one lol

Some of the shots

But i used a VERY tiny sensor so most bad star shapes are cropped off

[coarse quiver]

Looks similar, but I use full frame and I crop ~ 20% because of field rotation. I'm too lazy to compensate for sky rotation. And what you use for tracking stars?

Btw very nice fotos.
You have better post processing.

[lofty jewel]

Attention thread lurkers, your thread has been selected in the champion of thread comps. Go vote! #1369694419963613295 message

[nocturne pagoda]

a tiny Star adventurer 2i, def worth getting a better mount tho

[coarse quiver]

I thought to buy a Benro Polaris star tracker instead Pentax Astrotracer, should get better accuracy and following the target, so no need to reframe and auto go-to function is nice update. But not sure if this upgrade worse the costs...

[nocturne pagoda]

Benro is not even a actual EQ mount, its alt az which is worse than EQ at tracking, and its much more expensive than the 2i.

I would get the 2i or the GTi

[coarse quiver]

Looks good, also Rokinon 135mm but at f 3.5 or something like that quit strong spikes?
Seem like decent exposure time not much noise, but not aggressively stretched.

[nocturne pagoda]

At f2.8

Now i use at F4 bc 2.8 has some horrible stars and big blue halos that i had to remove

[coarse quiver]

Maybe you can try to use GraXpert it has deconvolution.

[nocturne pagoda]

I use cosmic clarity bc graxpert rly like to hallucinate stars and artifacts

[leaden pumice]

What do you guys think? About an hours worth of data of M16 and its surroundings at bottle 4, ZWO 2600 pro with Baader Neodymium filter. Not sure if I went crazy with the saturation

[nocturne pagoda]

Theres some wierd gradienys

But yeah noise is to be expected for only 1hr

10hr bortle 7, ASI585MC Pro

[leaden pumice]

The gradient is from sunrising, used pretty much all of the data for processing tests

[verbal quail]

Are there any ways to attach a canon EF rokinon 135 to an SBIG 8300m with the filter wheel?

SBIG themselves have an adapter but it's super expensive. If anyone else has an SBIG camera & SBIG filter wheel I'd love to learn how you got around that.

[small scaffold]

guys opinion on the imx 585 sensor with the roki?

[nocturne pagoda]

Best combo ever

i love itt

[small scaffold]

could you share me some of your images?

I think ima get that then, I'm thinking if getting the touptek mono which comes with the filter wheel and filters

also unguided how many second exposures can you take?

[nocturne pagoda]

On a crappy mount 5min

But thts with perfect Pa

[nocturne pagoda]

Mona samyang is a beast j rly want jt

Single sub at f2 no filter bortle 7

[small scaffold]

I have the iexos

ok ima save up for the mono then

[nocturne pagoda]

heres one mono image

https://app.astrobin.com/u/daniele.borsari

this guy is insane with the roki

[small scaffold]

oh damnn yeahh

[nocturne pagoda]

rn im saving up for a better mount and soon mono

[solid raptor]

I have some Highspeed baader f/2 SHO filters to sell if anyone is interested (EU)

[split willow]

would do some imaging at like f/4 for the stars, especially when imaging with the imx585

[nocturne pagoda]

I use it at F4, the horsehead was F2, to test the snr I could grt

Once I get my dualband filters i might shoot F2.8-3.2

[solid raptor]

https://tenor.com/view/fun-this-is-where-the-fun-begins-anakin-skywalker-revenge-of-the-sith-star-wars-gif-26313467

[nocturne pagoda]

might need your filters in a year or so lol

[split willow]

did you go full f/2.0 with the mono narrowband filters?

[nocturne pagoda]

I dont think he used those on his roki im not sure

[split willow]

says so on the ebay post

and he posted about it a while back

[nocturne pagoda]

Ive seen some people get almost perfect roki copies and they can use it at F2 with almost no abberations

[split willow]

thats what I got at f/2.0 with the imx585

some CA but pretty solid overall

[nocturne pagoda]

Oh wow my stars are unusable at f2

And I always have CA no matter what F stop

[split willow]

damn

[nocturne pagoda]

Is this blurxed?

[split willow]

I think so, yes

[nocturne pagoda]

F4 and F2

F2 does have some sensor tilit thi

thi

tho

[split willow]

but I usually work only with correcting, so no sharpening

[nocturne pagoda]

same

[split willow]

thats crazy

[nocturne pagoda]

I fixed the tilt in F4

[split willow]

didn‘t know it was that much of a lottery

[nocturne pagoda]

But the F2 CA is too much for me

[split willow]

osc definitely

but for narrowband that shouldn‘t be an issue I think

[nocturne pagoda]

Yeah

[solid raptor]

If they're still there, then sure (if you're from the EU)

[solid raptor]

F/2,4-2,8

[nocturne pagoda]

im not

[solid raptor]

F2 was neither great nor terrible since I used it with a 533 but I stuck with f/2,4 for fainter stuff

[nocturne pagoda]

Can I see some of your images?

[solid raptor]

Here's some Ha

[solid raptor]

And here

This is the only image I managed to finish. Around 3 h. It's just a crop

[civic mirage]

Been a while since I've seen an image from you now that I think about it

Still rockin the 135?

[solid raptor]

Yeah unfortunately I couldn't do much astro the last few months, even though the weather was fantastic

[solid raptor]

Heavy-heartedly sold it and put together this bad boy

Just testing it out for the first time. I seem to have some tilt but the unaffected corners seem to have pretty sharp stars. Testing the 7 nm Antlia Oiii filter on Polaris rn

My main concern is the mount. It's more than able to carry it but I'm far from having it dialed in

[civic mirage]

nice!

[solid raptor]

Thanks. Looking forward to some more pixinsight tutorials 😄

[civic mirage]

Maybe this week heh

[nocturne pagoda]

why are you so good at ap your astrobin profile is godly

[civic mirage]

lol, you should see some of the people over on r/ap

they do incredible work

[nocturne pagoda]

Yeah ive seen some

[civic mirage]

But thank you, lots of patience and learning was involved

[leaden pumice]

What filters do you guys use with your rokinon? I currently use idas nbz filter and the baader moon and skyglow filter. Trying to figure out what other filters I should add to my setup.

[nocturne pagoda]

Im planning to get the alp t ha oiii and sii hb

And gonna sell those once im ready to move onto mono

[hazy copper]

I had the Sii hb, never used it. Sii is just faint.

[hazy copper]

Uv ir cut, and a haoiii dualband.

[chilly ingot]

Hmm the nbz is like a 10-12nm dualband. +1 for just a uv/ir cut. Its better than the baader with a astrocam.

the broadband filters cut too much for the sensitive cameras for my taste. Unless you know all the lighting is sodium

[solid raptor]

It says in his Insta description that he's located in the Sonoran desert which makes the LP filters even more useless. Just stick to a simple uvir cut and your NBZ in my opionion

[chilly ingot]

Yep

[hazy copper]

Uvir 24/7 unless moon is over like 50%

[leaden pumice]

I use the baader moonglow filter during full moon nights, it makes a huge difference. I’ve been using the NBZ filter for the last few weeks and really taking advantage of moonless nights.

Thank you all!

[solid raptor]

You use the NBZ during moonless nights? I think the most reasonable way to go about it would be to use the NBZ during moon and moonless if you have to and a uvir cut during moonless nights. Also, if you desperately need broadband during Moon then use the moonfilter, even though these aren't ideal

[leaden pumice]

I got the NBZ filter about a month back, and I had my RHO project going on already. It didn’t make sense to use the NBZ filter for that project, but I was curious, so I tested it with RHO anyway. Since then, I’ve been imaging Hii regions, and the NBZ filter has been quite helpful. It’s a new moon here, so I have all the dark skies. But I’m going to go over all the objects without the NBZ filter and see how that turns out.

[solid raptor]

Yes the NBZ is great for what it does (I had two of them). During moon you can use it for Ha and discard the Oiii channel and during little to no moon you can use both

[nocturne pagoda]

My best so far

[leaden pumice]

Has anyone here paired the rokinon with the 585 sensor?

[solid raptor]

@hazy copper did that quite masterfully

[leaden pumice]

Awesome! Thank you!!!!!

[nocturne pagoda]

Me

I love the FOV

[leaden pumice]

Oh nice! How long have you been using this set up for?

[nocturne pagoda]

Start of 2025 i got into AP

But i had a dob and used it for a long time before i got this

[cosmic marlin]

The dark nebula parts left middle are really good

[nocturne pagoda]

thank ❤️

[cosmic marlin]

May I have some of Ur clear sky ?

How is Melbourne more clear than here smh

[nocturne pagoda]

uh

its the opposite of clear

[bold acorn]

no shot thats with a roki

[solid raptor]

Why wouldn't it be?

[nocturne pagoda]

sharing to phone lol

[nocturne pagoda]

newest one

[solid raptor]

HaRGB?

[muted oasis]

Would you guys recommend an sv220 for the samy at f2.8 (Am not paying for those preshifted ones they expensive)

[nocturne pagoda]

HaOiiiRGB

[solid raptor]

Ha blend looks pretty good. I failed with that

[spark wraith]

what filter ?

[nocturne pagoda]

ALP-T 5nm highspeed

[nocturne pagoda]

ty, it was quite hard to get it right

[hazy copper]

You want to stop down to F4.

Also looking at your gear, I hope you are getting an astrocam?

[muted oasis]

Yea I am

[mortal karma]

yo whats the best roki model for most convenient backfocus? not one of the mirrorless ones i assume

looks like canon ef has the most but it sucks caus i have a sony e 😢

nikon has a good deal rn tho

[hazy copper]

Canon, then screw mount mod it.

The Nikon can probably be modded too. I really should look into to it myself. But the adapter doesn’t exist.

[chilly ingot]

Canon EF mount best

For astro in general.

[chilly ingot]

Id get as Canon EF and a EF to E mount adapter. Who know's if you go astrocam later and then you are not stuck with a mirrorless mount roki.

For a decently tight fitting EF - E adapter, maybe K&F pro model with the orange band, it has a tighter tolerance

Fotodiox pro if they make one, the more expensive models are really tight fit

https://www.amazon.com/Fotodiox-Adapter-Compatible-Lenses-Cameras/dp/B008BBI9R6/ref=sr_1_1?crid=2SOUFBQKWF8AY&dib=eyJ2IjoiMSJ9.xMXnOY1WyLR7wx65zUU1eg4VsToRM5ECUoqSP0A8U-CGWiXruS562wVD_XFZa05a4waRhyk_NvtxGbxBOJvUsm3wGnhCXsS2BhBMCS3Xbfho_V51lxvW7NrK0O_uQ3A7iKu0cGuwHCZMwS4YIoRwLkwCZ784ItAJgNsSlo_A9siJsewxDovArThZd-1SlymueQFTyyEE_9HDDw5RKh-rcfeMwTCkd72V3fwgrwp0ANE.WEL8Z6tyxHbieNJfXRDgQhMRSpJs7qrDueoHRjxRrfY&dib_tag=se&keywords=fotodiox+pro+ef+to+e&qid=1756747831&sprefix=fotodiox+pro+ef+to+%2Caps%2C199&sr=8-1

yea this has a arca swiss foot

[mortal karma]

yeah sorry i meant to say i want to use with with my 533mc rn

but the adapter is a good idea if i want to use it with my sony camera

[chilly ingot]

ZWO filter drawer it is then

[mortal karma]

wut

i use the svbony filter drawer

[muted oasis]

get the canon ef one and do what oakley said your svbony filter drawer work just fine

[small scaffold]

hey so im using an apsc sensor with the samyang, with the nina direct guider, how many pixels should I dither?

[muted oasis]

I do 12px ( apsc sized sensor )

[nocturne pagoda]

i do 15

[rough vault]

Dayum looks awesome

[nocturne pagoda]

f3 has its benefits

[rough vault]

WIsh I was in F3 🙁 I am F5.6 at 140mm

[muted oasis]

The framing is SOOOO nice

[muted oasis]

Hey guys I am looking to connect my samyang to an ATR585C. Does anyone have experience with the Touptek ef to m42 adapter. Do you have any other recommendations

[slow tinsel]

is this unmodified?

emission looks so weak for allat dust

looks nice tho

[nocturne pagoda]

asi585mc pro

[nocturne pagoda]

light pollution

[tender bison]

Thats interesting, I never thought about this - given you are imaging in full broadband without any filter, shouldn't light pollution affect reflection (dust) and emission nebulas in the same way?

[nocturne pagoda]

Yes, this is how the region looks, i didnt use any masking so the brightness levels are pretty realistic

[mortal karma]

im trying to buy a roki right now i found a hella good used deal

waiting for the guy to send me star samples

[grave marten]

What's a Hella good deal look like?

[mortal karma]

400 USD for the roki, astrodymium ring kit w eaf mount and rails, and zwo filter drawer for canon mount

all stuff i would need to get anyways

[grave marten]

solid

[mortal karma]

i also found a killer deal on an msm nomad for widefield stuff but the ad is old and the guy isnt responding 😭

[mortal karma]

yo, the guy sent me a sample photo. is this good performance for wide open on a 533 sensor?

[muted oasis]

Is this blurxed?

[mortal karma]

@nocturne pagoda@hazy copper @grave marten

[mortal karma]

no

[muted oasis]

It's a very very good copy if you ask me

[mortal karma]

congrats on tp for your tarantula, its so so good

[nocturne pagoda]

This is miles better than my samyang 😞

[nocturne pagoda]

ty

[mortal karma]

good news for me i guess lol

[mortal karma]

any other questions i should ask the guy before i go thru?

[nocturne pagoda]

that was a narrowband sub tell him to show u a broadband sub bc narrowband often hides some problems

[mortal karma]

he only used it once thats his only shot lol

[nocturne pagoda]

bruvok

looks like a very good copy tho

[grave marten]

ask for the fits and not a screen shot

[mortal karma]

yeah it was a raw tiff and i put in in pix to examine

the pic itself is kinda dookie and has a lot of artifcats lol

[mortal karma]

what kind of problems?

[nocturne pagoda]

Fringing, my roki has this problem but it is fixable by using an uv it cut filter that cuts off more blue, like the Astronomik L3 is a good choice

[mortal karma]

that doesnt affect reflection neb?

[nocturne pagoda]

It affects all stars

Blue stars the most

I might have an example

bit like this (very bad fringing)

I shoot my broadband at f4 to avoid most of the fringing

and there are processing methods to kinda remove them

[mortal karma]

does blurx help at all

[nocturne pagoda]

Yes

basically fixes it tbh

[mortal karma]

even with using the L3 filt?

[nocturne pagoda]

I dont have it, i plan to buy it

My uv cut filter cuts at 400nm while the l3 cuts at 450nm which should get rig of like 80% of the fronge for me

but alot of ppl dont even get fringe so i think i js got unlucky

[grave marten]

Hampered by cloud, but still took the shot

[nimble stone]

i was doing sports photography with my roki today

i'm a human autofocuser its crazy

[rough vault]

how

explain

[nimble stone]

im just crazy good at nailing focus on my roki for sports where the subjects are characteristically moving very fast

i think i had like a 1-3% loss rate due to bad focus which is better than my autofocus lenses are sometimes

[solid raptor]

Nice, did you photograph a chess tournament?

[mortal karma]

hell yeah

my roki is delivered today 😎

[grave marten]

https://tenor.com/view/snoop-dogg-dancing-fun-funny-dance-dance-moves-gif-6648927863143953704

[nocturne pagoda]

W

[mortal karma]

is this 585? fire framing

[nocturne pagoda]

yea ty

doing this tho

2 panels of narrowabnd so far

only 1 hour per panel

[grave marten]

Man I forget how cropped a 585 is

[mortal karma]

gonna finish up m33 on my main then try this fella out

[mortal karma]

the aperture ring feels pretty clacky and cheap is tht normal

[nimble stone]

nope. soccer game

i'm blown away by how good my focus was that day

[rough vault]

Is there a 135 for Nikon f?

[muted oasis]

i believe there is

[nocturne pagoda]

using the roki at b1 tn!

[mortal karma]

GET A TRACKER FIRST

also, any roki users use high speed filters like the idas nbz or optologn L para? need recommendations

[nocturne pagoda]

I use the alpt highspeed duoband but its wayy too expensive

good thing it doesnt halo at all

[mortal karma]

i mean its only 100 more than the nbz and the L para, which are already 300. also fwhm of 5nm is half of the others which makes it tempting

[solid raptor]

Used the nbz, I liked it

Make sure to get the 2mm thick version though

[mortal karma]

they have different thicknesses?

what difference does it make

[mortal karma]

actually they have a 36mm version that is the same price as the nbz and para, but its unmounted which idk what that means tbh

[swift raft]

With uncounted filters you don’t have the cage of the filter which can be screwed in

It’s useful for filter wheels

[mortal karma]

this guy is trying to sell me a filter with this much haloing

[solid raptor]

There's the original with 2,5mm and a new one (NBZ II) with 2mm. This is a way more common thickness and allows you to use a uvir cut filter that also has 2mm. This way your backfocus shouldn't change all that much. Of course production tolerances exist and the Roki is very sensitive to change of backfocus

[nocturne pagoda]

😭

[modest knoll]

Yes, I have one

I envy you lucky bastards with good copies of the roki

[rough vault]

wdym 😭

[modest knoll]

Mine is ass

Samyang has bad qc

I got a lemon

[rough vault]

wdym 😭

[chilly ingot]

i got my lemon samyang fixed under warranty

[modest knoll]

My warranty ended a few weeks ago

Plus I bought it from mpb

[modest knoll]

What else would i mean 😭

[mortal karma]

ive been searching and searching for a used highspeed dnb filter... ill just buy one new

idaz nbz ii seems good

[grave marten]

I don't use hi speed, just regular. But I also use a step down ring. results are excellent though

[mortal karma]

yeah i could try my sv220 but id be throwing away a lot of signal in the f2-f3 area

[nocturne pagoda]

left is a 120s sub at f3.2 and right is at f2

[muted oasis]

At some point someone sent like a cheap circle EL panel from AliExpress do you guys have the link. Am looking to make a cheap motorised flat panel at some point for the samy

[mortal karma]

poor stars :(

[hazy copper]

You have a 533? I wouldn’t. Sell it and get a minicam 8 or Touptek 585 mono bundle.

[mortal karma]

im waiting a year to save from my college job to get a mono imx571 and good filters

for now i think a highspeed dnb is a relatively cheap investment to have for a year, then i could resell it for little loss

many times when i shoot a target i feel constrained by the fov of the 533, so i dont think i would be happy with the 585. im young and have lots of time to get into astro so might as well stick to the 533mc until i can splurge on an apsc mono system, no rush

also... i have asiair 😅

[hazy copper]

Fair

Although I wouldn’t say fov is an issue. You can do a 1x2 mosaic and still improve your image quality significantly.

[mortal karma]

indeed but the tradeoff is time

[hazy copper]

Nah time taken is still less due to the increased efficiency of mono

[mortal karma]

even by 2x? difference in QE is just like 10% or so right

[hazy copper]

The bayer matrix cuts out like 75% of blue and red signal. And 50% of green.

So it’s approximately 3-4x as efficient. Plus your colours will be much better with mono.

[mortal karma]

but this is compensated by osc capturing everything at once right?
eg, 4 hours on osc is like 1 hour on red, 1 on blue, and 2 on green, so doing that same split on mono should be equivalent (ignoring QE and other stuff, just talking about bayer matrix)

[hazy copper]

Kinda. But why would you want 2 hours green? The bigger problem is when doing narrowband.

[mortal karma]

yes very true

now im really considering the 585 bundle and selling my asiair for a stellavita or smth lol

[hazy copper]

I wouldn’t say I regret my 533 and dualband filter purchase because I got it for 50% off and the 585 wasn’t really a thing at the time. If I bought it now it would be a waste of money.

Glad I never bought an asiair though

[mortal karma]

yeah i didnt know the 585 bundle was a thing

[modest knoll]

holy shit

is that ha?

[grave marten]

Ha is OP

[mortal karma]

is the roki focus sensitive to temperature

bouta have my first night w it so should i set the autofocus to every 2c or something

[muted oasis]

from my experience its not that sensitive

[mortal karma]

https://www.firstlightoptics.com/adapters/astro-essentials-samyang-lens-to-m48-adapter.html
is this a good solution to tilt in my lens? @hazy copper whatchu think

it replaces the bayonet itself

its pretty bad 😭

[bold acorn]

the bayonet causes this tilt?

I have some tilt or aberration issue on one side of my image perhaps this is the reason

[mortal karma]

yeah its a known issue apparently

[mortal karma]

the reviews on this items say its good for fixing tilt, sucks the shipping doubled the price lol

[hazy copper]

Yes it is. But not hugely better than a tuned up bayonet.

[mortal karma]

how do you tune it?

are there adjustment screws or something

[hazy copper]

Just a nice flat shim. Aluminium foil

[grave marten]

There are also 3d prints for the bayonet replacement m48 thread adapter if you 3d print

[mortal karma]

ill try some testing tonight and if i can get a flat field ill return the m48 bayonet replacement

[mortal karma]

i dont trust my unis PLA

[hazy copper]

I made my own. It certainly gets rid of basically all tilt.

[hazy copper]

I wouldn’t trust anything tbh. Screws are too small and the lens is pretty heavy. Plus even a few microns of warping is noticeable as you know

Here’s the one I made

[grave marten]

I mean its all in a caddy, so its not like anything is just hanging off it.

[hazy copper]

Just a 1.25 to 2” adapter with some minor changes on the lathe and holes drilled.

I would personally get one from jlccnc before I used a printed one.

[mortal karma]

oh sick, did foil not do it for ya lol

[hazy copper]

I wanted less backfocus.

Foil worked well

[mortal karma]

do you mean more back focus? why less

[mortal karma]

how did you secure it to the bayonet?

[hazy copper]

It just sat there

[mortal karma]

good ol friction

[hazy copper]

So I can eventually fit a rotator in, and filter wheel.

[hazy copper]

Yeah the idea is it barely compresses.

[mortal karma]

how did you go about making it urself? the m48 replacement i linked earlier says it also has a backfocus of 44mm, not any more than normal

[hazy copper]

https://cdn.discordapp.com/attachments/794653768909979708/1441640566025752596/image0.jpg?ex=692dbca7&is=692c6b27&hm=5d7eb346e773e5baaf8ec00977e92344767da0dc9676d34dbbe6a0c97ada9927&

This adapter. Turned the 2” part down and the inside out a lil.

Turned the mating faces flat

[mortal karma]

oh nice

[hazy copper]

Drilled and countersunk holes to match the screw layout

[mortal karma]

ive gotta try something like that, im machine shop certified at my uni but i havent been in a while so i kinda forgot stuff 😅

[hazy copper]

This is Nikon specific though. The canon is slightly different but should still work.

It was super easy to make. All the important stuff was already made

It is m42 not m48 but it doesn’t matter at all.

[mortal karma]

i wonder why the tape didnt work? it should be the right thickness

[hazy copper]

What’s up with that bunching up at 2 o’clock?

[mortal karma]

i think that was after i tookit off and put it on a bunch of times to try and see what was up

[hazy copper]

The lens itself could be slightly tilted but I wouldn’t imagine the tape would be smooth. The difference thicknesses will compress differently.

[mortal karma]

i hope not, the sample images from the guy who i bought it from looked very good, and it was packaged well

[mortal karma]

btw does this mean that the top left corner of the sensor is farther from the OTA than the other corners?

or other way

ill try tape and foil again, but the ef adapter is already pretty tough to get on so i wonder if its even that

as in theres a lot of friction to twist it on in the first place

[hazy copper]

Judging by your corners I’d say too close.

[mortal karma]

tried my best but it got a little wrinkled 😓

[mortal karma]

foil didnt help :(

[hazy copper]

Rip, maybe it’s the camera

[mortal karma]

i have a flat field with my main scope

i tested a sub and it looked very good

[mortal karma]

btw what do the numbers on the tiltanalysis mean? i get lower with the foil/tape

[hazy copper]

Means it’s better focused

[mortal karma]

oh foil helps with that i guess

maybe i need a couple spacers

def not the camera, i rotated it and the coma is still on the same corner on the sky

not same camera corner

[mortal karma]

after an hour of putting tape in various places im finally getting better results LOL

[mortal karma]

nvm it was a ffluke

bro.

[cosmic marlin]

I'm thinking of doing this aswell, considering 55mm baxkfocus didn't focus on the redcat I assume it won't for roki aswell

[mortal karma]

just gonna accept the shitty field until the m48 adapter comes

[bold acorn]

turns out i have it

[bold acorn]

you got that file?

[mortal karma]

https://www.thingiverse.com/thing:6151763

im also getting the flange replaced bc why not, jlc has good coupons right now
https://www.cloudynights.com/forums/topic/969814-my-attempt-at-strengthening-the-mounting-flange-of-rokinon-1352-canon-ef/

[bold acorn]

I took the back off and I accidentally lifted the aperature ring

the aperature click ball is gone

fell in there

[mortal karma]

uhh

probably not good

[bold acorn]

nah its fine I think i got a replacement somewhere

[bold acorn]

whats jlc?

I was thinking of converting my sony e mount into canon

do you know where i can find canon bayonets?

[mortal karma]

custom manufacturing company

[bold acorn]

even a printable model too

[bold acorn]

ohh cool

[mortal karma]

shipping is a lil expensive plus there are customs tax so it kinda sucks now compared to what the guy in the forum got

[bold acorn]

also do you know what the backfocus is beyond the point where all models are the same?

[mortal karma]

wdym?

[bold acorn]

the part above the aperature ring

[bold acorn]

where you attatch this

[mortal karma]

https://www.cloudynights.com/forums/topic/939531-my-rokinon-135mm-modifications/

[bold acorn]

oh ok 49.9

[mortal karma]

my cost for the jlc cnc metal flange LOL

[grave marten]

It's a creative way to get around tax.

[bold acorn]

damn kinda cheap

[mortal karma]

after the discount yea

[mortal karma]

i can only find files for adapters that replace the entire back, not just the bayonet. do u have it?

[mortal karma]

FLO emailed me after i order this and told me i was gonna get wrecked by tariffs lol, so ill probably cancel and find another solution

i found a petg-cf version on etsy which i doubt would get tariffed

[grave marten]

Yeah it's weird. Wonder if they got taken down for infringement or something. Last time I seen them was a couple if not more years ago. I have one of the machined metal ones somewhere . I don't use it because I still use the lens on my dslr. If I can find it I'll let you know.

[mortal karma]

could only find this very basic drawing from the etsy listing, i might try to make it myself in the unis machine shop

[muted oasis]

If you guys find a solution to this please share cause am getting a cooled cam to use with my samy and currently with my DSLR I get lots of tilt

[mortal karma]

i just went ahead with the purchase from flo for the m48 adapter

tariffs can eat my ahh

[mortal karma]

blurx will be my savior until this adapter and tilt plate ship

[grave marten]

Some Rock'n On 135 data with fat 1600mm pixels

[mortal karma]

goodness

[civic mirage]

1600mm pixels phat?

Also, I will soon be putting together a similar rig with my 1600mm. What's your imaging train look like?

I assume I just need the Canon EF to M42 for the 1.25/31mm EFW's from ZWO?

[grave marten]

compared to the 2.3 of the 294mm yeah, 3.8 is kinda fat.

[mortal karma]

finally got my m48 adapter

im killing that tilt tonight

[warped walrus]

I tried 3 and they were all lemons

[modest knoll]

😭

[bold acorn]

wdym

[warped walrus]

What I mean is the three of them had some corners that were really bad. Bloated and very deformed stars. In two of the units they were opposite corners so it was not tilt. The third one had more like a tilt pattern on it so I could maybe have tried to save it, but I decided to send them back to Amazon

[bold acorn]

an idea of all time

coma corrector + sharp lens = apod

[solid raptor]

Stick another CC behind it, just to be sure

[bold acorn]

yes i was thinking of adding a reducer and a 3x barlow

more glass = better because a triplet is better than a doublet

[solid raptor]

[mortal karma]

is this amt of blue haloing normal wide open w uv ir vut?

[civic mirage]

If its OSC and a mediocre copy I'd imagine so.

[warped walrus]

I think that's decent.

Two of my copies ...

[mortal karma]

its a pain to deal with so i guess ill just stop up to 2.4 or 2.8 for broadband lol

[warped walrus]

The qc of this lens is crap. If you get a good copy it is a damn great lens, but it is a gamble

[pallid patrol]

That’s shockingly bad, what FL do they plate solve too?

[civic mirage]

Direction of most unfocused corner to the other most unfocused corner seem quite similar between the two, this might be tilt that could possibly be fixed.

[mortal karma]

tonight i discovered that neither my eaf nor my camera cooler works in -10c weather

[civic mirage]

Like 14 F, man I would expect my shit to work at 14 F ngl.

Lmao I just looked and it's 14 F right this minute.

Everything is working as it should.

[mortal karma]

the fan was making very funky noises and vibrations and the EAF was lagging out horribly, i would press it once and it would spin all the way to one end

the camera is only rated down to -5c

[warped walrus]

maybe partly, but not fully. In the first image the panels that are best focussed are the bottom center, center and upper right, on the second image bottom left, left, center, and upper center are ok. In that second one, also the upper left and bottom right show the typical pattern of being to close the lens to the sensor and therefore 'overcorrecting'. That cannot be tilt in my opinion, for tilt you would expect to have opposite effects, elongated radially in one, elongated circularly in the opposite direction.

They were just horrid copies. I even got a third one and tested it daily with two different cameras and it was pretty bad on the corners, so I didn't even bother and also went back. So three lemons.

[pallid patrol]

This is pique my interest, 3 lemons is one hell of a run of bad luck. They all plate solved correctly?

[warped walrus]

What do you mean with plate solved. This was a few years ago and I was not really plate solving back then.

[bold acorn]

I see alot of the time the bayonets are an issue I'm in the process of converting mine to use a shorter and new bayonet

my Sony e mount one has a pretty iffy design that looks like it's quite susceptible to tilt and the results definitely show it

[grave marten]

I've said on a few occasions that after all these considerations...something like the fma135 or fma180 pro makes more sense. You get standard mounting solutions, standard filter solutions. Unless you get the lottery and hit the F/2 jackpot.

[nocturne pagoda]

got a pretty bad copy but with some blurxterminator and processing its still very usable

[bold acorn]

fair

never knew qc was THIS bad

thought it was like 1/10 are bad but now it seems 1/10 are the good models people are considering when talking about its quality

[bold acorn]

still awesome details

can't you do some processing on those stars to kill the blue?

are you using a uv/ir cut also?

[grave marten]

I've owned several without a single issue. Additionally I own the 14, 50 and 85mm variants without issue

[nocturne pagoda]

tried, its very possiblr

[nocturne pagoda]

yes but i found that you need a uv ir cut / L filter that cuts out more blue to remove the fringing

the Antlia L filter is great for that

[mortal karma]

how does this affect reflection nebula?

[nocturne pagoda]

wont affect it

[grave marten]

Helps in my book

[mortal karma]

i need one then lol

[mortal karma]

do you mean astronomik?

[mortal karma]

do you use the L3 filter?

or L2 or smth

[nocturne pagoda]

L3 should also work

[nocturne pagoda]

no Antlia

the luminance filters are the same as uv ir cut filters

[mortal karma]

i cant find the antlia lum alone lmao

nvm theres one from starizona

[mortal karma]

is that image with the antlia L?

[nocturne pagoda]

thats with a crappy zwo uv ir cut filter

it doesnt cut much blue which is why you see the fringing

[mortal karma]

ohhh ok nice i was worried it would still be that bad with the antlia l

my copy gets crazy fringing it kind of ruins my broadband data lol, thanks for the rec

[nocturne pagoda]

np

i plan on getting it aswell

[mortal karma]

[mortal karma]

just to be sure this is the correct filter? https://starizona.com/products/copy-of-antlia-v-series-l-filter-2

[nocturne pagoda]

yeah should work good

my one cuts the uv at 400nm which is not enough for my roki

the antlia cuts at almost 450nm

[nocturne pagoda]

i get ts 💔

[mortal karma]

looks more like 430 ish from the graph

[nocturne pagoda]

still good

[mortal karma]

bet bet

[nocturne pagoda]

cant gaurantee that it will work perfect tho

youll js have to try

[mortal karma]

i pmed some people on astrobin

who use the antlia v with the roki

[mortal karma]

is there a way to estimate the wavelength of light with photometry in pix or something? would be nice to see

maybe i can just take the hex code and match it

[nocturne pagoda]

idk

[mortal karma]

im getting pretty close to 450nm, but this is very unscientific and also probably depends on how well the spcc did lol

did some other random spots and got around 400-450

omw to buy a slit mask

if the L3 takes care of most of it then the antlia L probably takes it even further

[mortal karma]

first clear night in a while to test the tilt, turns out the m48 thread adapter did not fix anything, but fortunately i also bought a tilt plate for the 533. but then unfortunately, i could not get the backfocus or tilt to work out after 2 hours so i gave up

📈📉📈📉

[vapid grove]

Rokinon with a 2600mc pro. On a AM3 mount with asiair and all the fixings. Got about 25-30hrs. It's amazing the dust that shows up

[bold acorn]

damn got any crops?

[vapid grove]

Crops?

[bold acorn]

crop ins

on orion or something

[vapid grove]

No, sorry I don't.

[mortal karma]

interesting background color

[verbal quail]

Anyone know why A rokinon 135 with step down rings might have an X diffraction spike?

I'm using step down rings to avoid big diffraction spikes, but that seems to produce inverted spikes.

Could it be the threads on the inside of the innermost ring?

[bold acorn]

i gt those i think its some kind of obstruction in the tube

[verbal quail]

The weird thing is they only appeared after I bought step down rings.

[grave marten]

~1hr raw live stacked data with Rokinon and 2600MC. No post.

[nocturne pagoda]

1hr of narrowband on vela

[mortal karma]

damn

now make it 10

[nocturne pagoda]

how about 20

[mortal karma]

40

[nocturne pagoda]

20 narrowband 20 broadband

[mortal karma]

@nocturne pagoda fancy ass case 💀

felt and magnetic

i also got an everyday astronaut sticker for some reason??

[nocturne pagoda]

lol

[civic mirage]

Going mono?

or upgrading filters?

[mortal karma]

just a better uv ir cut since i get blue haloes with the roki with the cheap zwo uvir

[civic mirage]

Does it have a tighter UV cut off than your previous filter?

[mortal karma]

yeah cuts off around 425

zwo cuts below 400

[nocturne pagoda]

up to 12hrs of narrowband

[modest knoll]

damnnnnnn

[mortal karma]

i spent 8 hours last night and 5 hours just now trying to fix the tilt problems with my lens

literally just fiddling with the tilt plate in the cold

im gonna buy a new one thru amazon and if its better then ill return the old one because holy balls this is cooked

also the zwo tilt plate is so ASS because you have to unscrew the whole camera off to change the tilt and put it back on and replug in everything

[solid raptor]

https://tenor.com/view/dr-dre-snoop-dogg-1993-who-am-i-white-sox-gif-5264192877979703441

[mortal karma]

ridiculous that they made it the same exact diameter as the camera 😭 every other tilt plate sticks out so u can adjust it, huge oversight tbh

[cyan obsidian]

How would a canon 600d paired with one of these generally work out?

its a stock 600d so i question whether I'd need any UV-IR cut filter or some LP filter

anything I should consider before investing in this lense?

[chilly ingot]

a stock camera already cuts off uv and ir. Broadband lightpollution filters is not something id recommend ever

it just cuts off signal around the sodium lights bandpass so the images you get are less bright

Can exposre for longer in areas with alot of those oldschool streetlights. It still cuts signal out though

best filters are in ur car to go to a darksite

[cyan obsidian]

I live in a relatively low light polluted area anyway

[chilly ingot]

Nice, it only makes sense to shoot broadband in low lightpollution. When you think a filter is needed for that, the area is not suitable for the target anyway 😄

[cyan obsidian]

i mean dolphin head potentially

ig i could look into potentially astro modding my camera n the near future

[civic mirage]

Yes a duoband filter for emission nebulae is good

You'd want a modified cam for that yea

[hazy copper]

Better off getting a new camera atp.

[cyan obsidian]

that's true

I might see what I can achieve with stock for now

[nocturne pagoda]

mmm

[muted oasis]

These colours are tickling my brain

[crystal onyx]

I just bought the samyang 135mm f2

Used for around 200 bucks

[muted oasis]

WOW thats a steal

[nocturne pagoda]

12hrs NB 6hrs RGB

[spark wraith]

https://tenor.com/view/cool-jk-simmons-fletcher-whiplash-nice-gif-18304696