Rokinon/Samyang 135mm discussion

[uneven compass]

I would have gone with the zwo either way as I bought used, but I am curious

[civic mirage]

I wanna make sure I'm right on this, but does ZWO include 12v power for the camera in the box?

I heard they don't, but it amy have been older cameras

[gleaming flare]

doesnt look like player one includes 12v power

?

[uneven compass]

Nah

They don't lmao

[civic mirage]

Tf

Idk where I heard they include the power supply but nvm

[gleaming flare]

they include everything except 12v

[civic mirage]

I've been sitting here thinking that was one of the improvements...

Why is it so hard to include a power supply that is needed to simply run the cooler that you've already paid for.

[uneven compass]

Phone manufacturers be like:

[civic mirage]

Mhm... Smh

[shell wasp]

yeah for 800 dollars that’s stupid.

[tardy epoch]

only reason id choose one over the other is the usb hub on the back of the cam, p1 has a single usb c iirc and zwo has 2 type a ports

USB C seems kinda dumb really, most astro stuff hasn’t left usb 2.0 so why swap to c

[civic mirage]

This was the deal when USB c first came to consumer tech

Hopefully it'll be more widely used soon

Well see

[hazy copper]

All player ones stuff that would connect to the camera is usbc I believe

Filter wheel etc

[tardy epoch]

ah, then its not that bad then. my only complaint then is that usb c is more fragile than the large b connectors. (to be fair I've had both break)

[worthy grove]

More fragile? I find usb c much more robust. Aside from the sods law of trying to put the usb2/3 in backwards nearly every time as sods law dictates 😂

[brisk yoke]

I have a question about the samyang 135mm. If the temperature changes during the astro session, do i need to refocus?

[worthy grove]

Yes, but it's pretty forgiving. I ran sessions through the night where the temp changed 3 or 4 degrees c and didn't refocus and it was fine

Ideally if you have a eaf you would regularly

[chilly ingot]

with usb-c i could have so many more ports in the asiair mini

also easyer to plug in.

i need to paint a dot to old cables to see the orientation

[brisk yoke]

Will a USB dew heater help?

[worthy grove]

I used one but only to protect against dew. Not sure what it did re the focus, but like I said it wasn't really an issue. Best thing to do is run a session and see what your focus is like after a couple of hours?

[chilly ingot]

Focus shift at f2 is no joke. There is plenty when the lens is cooling down to ambient

Should hold when the temps are steady

I found that a dew heater makes the lens behave nicer to ambient temp shifts

[worthy grove]

I always set up in the daylight and it had cooled to ambient by the time I started imaging so I guess I never saw this. As I said 3 or 4 degrees change during a session didn't cause any issues

[brisk yoke]

How often do I need to refocus?

Like 30min, 60min?

[worthy grove]

Whenever its out of focus? You can see for yourself. Totally depends on the temperature changes and your lens. Like I said I never had to during a session throughout the night

[chilly ingot]

i had alot of problems when i take out a room temp lens out of the bag and start to image

with a bathinov mask its a pain. EAF setup is total bliss

[worthy grove]

Yeah mine has always been out for hours before starting

[chilly ingot]

i wanted to start putting my kit in the balcony to cool before i go out

not needed with eaf

it just does autofocus like twice in the first 30mins

focus before PA, focus after framing target, then temp/hourly autofocus

while watching netflix

zero out of focus subs

before that i had to delete alot of data

drift was bad for me

check this out @worthy grove https://cdn.discordapp.com/attachments/677128422580944907/1135144064367464458/Stacked10_FOV_500.png

this is a sigma 100-400 zoom lens test untracked. round stars

10x 0.5s subs at 400mm

i loved the finding target at 100mm and then zooming in for framing

[worthy grove]

Looks great

[chilly ingot]

the roki of zoom lenses

not that fast. but ok speed all the way zoomed in

[worthy grove]

Looks promising. Have you done any full sessions with it?

[chilly ingot]

nah, astrodark is slowly coming in august

only did some fooling around from my balcony

mid next week is the comeback of nautical dark

gonna put the dual narrowband in and try some Veil etc with the canon 200

[uneven compass]

Guess who did yet another reprocess

Which one we liking more

[tardy epoch]

well I’ve had two USB C ports break on me and only one regular b break… to be fair the two USB-C were minor and didn’t break on my 1600MM pro that I’m about to send off for repairs😭

[civic mirage]

USB-C is def the future, but it's not 100% ready yet. Almost there tho.

[chilly ingot]

There are crap usb-c and the nice tighter fit ones

I hate the ones where half the connector sticks out and wobbles

[velvet lark]

You know with the Roki if you take a picture of a nebula can you kinda crop the image to zoom into it if you get what I mean

[shell wasp]

yes…

[hazy copper]

Uh

[worthy grove]

You can crop any picture you like, not specific to the lens used?

[velvet lark]

K

Would I loose quality

Tho

[worthy grove]

No, you would just have less picture, If you mean zooming in further, as long as your resolution can support the zoom then its fine? Its all about the resolution

What res are your images your want to crop?

[shell wasp]

i mean youd lose resolution obviously

[velvet lark]

I haven’t used my Roki yet I got it today

Wait so just to get myself clear like my Roki doesn’t zoom so basically align my self with the target which would usually be a nebula and then I take mabye a 10 second exposure and because my lens is so good at collecting light I should see the nebula

[civic mirage]

Dont worry about zooming, it doesnt matter with this lens. Also yes, youll point your cam and lens in the general location of what you want to shoot, take short test exposures to make sure your target is framed up to your liking and setup your sequence for the night. Depending on your mount try using longer subs like 1 to 2 min sub exposures.

[velvet lark]

Ok I got you so it’s basically a light bucket and it doesn’t need zoom but what about super faint nebulas and also I want to image the andromeda galaxy and Ik the Roki isn’t for galaxy images but it can do the Andromada but it I did so andromeda would I then need to crop

[civic mirage]

Yea it collects light very quickly indeed, which is very useful for imaging the faint nebulae your talking about. Depending on your light pollution you may not be able to see faint dark/reflection nebulae (usually the hardest targets in terms of nebulae) in one single frame, but with such a fast lens it will provide better results in faster time than slower optics. As for andromeda, this lens will do just fine, you'll have the possibility to get some quite nice detail on andromeda.

[worthy grove]

As I asked before what resolution are you imaging at? I would have thought 135mm would be fine for most camera resolutions for the Andromeda galaxy. It's massive

Stick your camera details into the online field of view simulator and you will get a good idea of what it will look like

[chilly ingot]

New registered shipment to my post app

Roki on its way home

Guess i need to add it to my gear shakedowb imaging night on the friday 11th

[velvet lark]

also these were taken by my Roki 135 f2 do ye think that they are in max focus because idk if my Roki is a bad one

[twilit hound]

this is a good copy, keep it

[velvet lark]

You sure?

[chilly ingot]

Take a sub at polaris in the middle if ur untracked

nothing to say if everything trails

[velvet lark]

I have a tracker

So will I do a 30 second exposure on Polaris

[chilly ingot]

well looks like the tracker was not on

Or maybe the polar aligment was off. But take a exposure at polaris, try 10.15,30

[chilly ingot]

Also click it down to 2.8 and do the same sequence

[hexed fable]

Hi guys! Here my work on North America Nebula taken with Samyang 135mm f2 and my Sony a6000 original from inner city 75% moon, what you think? Is about 4,2 hours 20 second at iso 400, f2.8 stacked with only dark frame in dss and post process in Siril please give me some feedback i’m new in this world 😁✌️ ciao from Italy!

[solid raptor]

A duo narrowband filter would suit that target, especially in a city

[twilit hound]

Mhm

[velvet lark]

McKay 😂

[twilit hound]

lol

[hexed fable]

Even if the camera isn’t modified?

[solid raptor]

https://cdn.discordapp.com/attachments/1108777375564570655/1112461046150615180/NGC_7000s.png Have a look at it

It's only 3,1h into a city light dome, also using an unmodded a6000

[hexed fable]

Impressive!!

[civic mirage]

Sorry this image looked really neat so I did lil edit on it , this your image correct?

[solid raptor]

If you're interested in the filter let me know

[solid raptor]

Yeah it is, thanks for the edit xD. The tiff is somewhere under 3,1h on NA o sth

[mystic loom]

copy #2 from amazon, f2 2.8 3.3 and 4
lmk if you think this is more tilt than lens, or if lens?

(I did a bunch of shots at f2 and 2.8 with a tilt spacer in place at T, B, L, R, TR, TL, BR, BL too but sharing first without)

also how do you stay sane hunting for a copy that is good, this is exhausting, lol

[chilly ingot]

looks like my roki

Stack some of those and the bad stars will only get enhanced more bad

[mystic loom]

Oof

Do you shoot at 2.8 and then get stars from even tighter? Like 5.6? Or does this point focus issue have noticeable effects on nonstellar too?

Getting the sense this is another return—I have a cine I’m talking to someone about buying, waiting on their raws tomorrow , and trying to decide if I have another go at the Amazon lottery

How many tries have you all made with these before you found your one?

[chilly ingot]

Never got the memo. 6.41um pixel size hid some of it. Sent mine to warranty. Still on its way back

But yeah i dont like those triangle comet stars

[hexed fable]

Yes I’m interested, which brand do you suggest? I looked the stc Astro duo narrowband

[solid raptor]

Would you check your direct messages please?

[chilly ingot]

wondering how its gonna look if you nail the focus in the middle

idk man, feels like roki's are above 50% bad off the shelf

my canon 200 seems allright with a 58mm stepdown ring

only did untracked subs since mount still on its way. no astro dark, slight signs of trailing

sun sets in the north so doing subs at polaris kinda meh

(plus balcony faces south anyway)

started to get some red fringing on orange stars, that was focus sensitive. went away with perfect focus

thats around f/3.45

wide open and 62mm stepdown ring looked the same. could probably be fine with dual narrowband

[gusty rock]

Damn

Very nice stench

[chilly ingot]

[mystic loom]

yeah this has me starting to think my next roki is going to be an askar fma180

fma cult, lol

[patent dove]

fma180 will have better stars for sure

it’s just 5x slower

[uneven compass]

Roki is never going to have absolutely perfect stars at f2 tbh

In my opinion it's worth it for the speed though. You can always retake stars

[mystic loom]

so on a copy with imperfect stars, you won't notice the field issues in your starless integration?

[uneven compass]

I don't think you should for the most part, though star removal is a pain

Also I do believe there is a sharpness benefit to stopping down

[mystic loom]

and real world how far in should I expect to have to stop down on before seeing round stars on an "acceptable" unit? If the one I have here is normal for the real world, what is a normal stop to say "this unit is... nominal" for the whole jam

[twilit hound]

I'd say this is just shy of being a bad copy, but you could keep it

Its not too bad

[mystic loom]

I've got one other to show, that I've been talking with someone on

it's a cine

[twilit hound]

It is a lot better than my amazon copy

[mystic loom]

you mean the cine? I just stretched it, here is a sample

this one seems to be a lot better

but not sure if you all agree! I don't know if this is f2 or 2.8 (or about, since it's a cine) but he shot at 2 and 2.8 for me, not higher f stop equivs

oh I see the spikes, so prob 2.8ish

but that seems pretty good?

[chilly ingot]

Diffraction spikes. Is that with a fullframe sensor?

[mystic loom]

I'm rolling a smaller sensor anyway, so that vignetting wouldn't be as big a deal for me

Sony ILCE-7m4

in the header

[chilly ingot]

sending you two subs

one fullframe 2.8 and one f2 with 533mc

fullframe 5d mk2 broadband

f2 533mc dual narrowband

same lens.

the smaller pixels MURDERS the optics

[mystic loom]

another from his set of samples

[chilly ingot]

even though the narrowband makes stars tighter

stacked up that heart&sould could not have been saved.

it only increased the weird starts to a point where blurx had no idea what to do

starx left the comet tails in

[mystic loom]

so IDK, this cine looks like it could be better than mine, at least at an acceptable 2.8

lmk what you all think

[chilly ingot]

here is the few subs stacked

it only amplified the stuff for me

but for my lens, it did not improve with stopping down

i did f4.5 or something marks chain, all the areas affected had probles, just less effect because of slower light gathering

as if i did a faster sub or something

my filter kinda shifts colour when its angled. the corners in focus are different shade

[chilly ingot]

this looks great though. if you use a smaller sensor like ur 533 it should be mint

i hope

kinda like, ur not using the edges of the light cone at all yea?

[mystic loom]

exactly

[chilly ingot]

the smaller pixels might show some weirdness, but overall i think it should clean up

or narrowband filter makes small stars not appear and larger ones tighter

also, the whole frame is in focus, so you can do the trick with imaging stars broadband stopped down, swapping a filter in and blasting nebula data much faster

[mystic loom]

which Im used to doing anyway with my regular refractor, because I hate the color of NB stars

[chilly ingot]

im gonna do that myself. got a extra filter slider to my drawer

[mystic loom]

so that one looks like it might be a buy?

[chilly ingot]

well actually i got a filter drawer for my newt/frac and just borrowing the slider

yeah id go for it. what do you think @short charm

argh i want to go imaging too

so hyped up

mount in belgium customs, astrodark in 23rd of this month

2 weeks

my roki arrived in country now

should get it this week

im actually really curious if the professionals made it a razor sharp imaging weapon

[short charm]

So it probably will be fine for up to 4/3, but aps-c and full frame isn't good here tbqh. The stars really look like seagulls at the edges, but it may be fine closer to center. Unfortunately there's no tracked data, so hard to tell if the stars are trailing vs actual aberrations. I'm assuming that he shot with a full frame?

[mystic loom]

shot with full frame camera

he took them on a tracker:

"alright let me know if that works.
files 1-5 are f2, the rest are all f2.8.
like i mentioned before, same star in all corners, and focused on the dead center to start the series no refocus in the corners. used the same method on the 30s exposures. unfortunately i think my alignment after the first exposure got a little off i dont think my ballhead was up to task last night. but the slight trails wont affect the stars overall look. a few of the 30s exposure seem to be a little brighter than the others, thats for sure because the star target in those is closer to the horizon and lp and moonlight hit those exposures harder. but exif is exactly the same as the others, no change.

Let me know if you want to get it that way i can box it up and mail it off for you first thing tomorrow! "

i shared the ones that seemed to have far less trails

[short charm]

Can you upload 1-2 tiffs?

Or pngs

[chilly ingot]

@short charm i was thinking about this

[short charm]

Jpg compression really hurts the analysis

[chilly ingot]

533 would be jamming with that probably?

[short charm]

That's the one I was looking at, and it's hard to tell on the aberration part at the edges of a guesstimated 4/3 sensor region

[chilly ingot]

I think only fullframe vignets that much

[short charm]

Yeah 533 would be fine prolly, but idk fully yet. CA doesn't seem noticeable, but the star shapes are weird and I wanna know if that's from the blades or actually lens defect

[chilly ingot]

[gleaming flare]

this is how i imagine bortle 1 milky way naked eye

[mystic loom]

the uploaded version are pngs @short charm

[short charm]

Yeah looking rn, thanks!

[mystic loom]

thank you!

[short charm]

Hmmmm the star shapes are ok, there's a bit of a backfocus problem it seems, but that's solvable. Some stars do have a bit of purple tint to them btw, but it's not too bad and you can fix it in post. Also maybe just pmcc will do the trick. I'd say that's a decent copy yeah

[mystic loom]

enough to end the hunt you'd say? It seems like this can just go on forever looking for the perfect one

I suppose one could go absolutely nuts and buy 10 of them at a time but I am not that person

[short charm]

Yeah it's hard cause there are so many variables lol. Also, smaller pixels will definitely hurt a bit, for example I'm not using my copy with the 533, as the quality difference with my 4.7 micron DSLR is insane

I'd say that you can end the hunt here, it is a cine though, so be sure to tape the aperture ring lmao

[mystic loom]

as long as its basics are in more or less the right place it seems one could shoot stars even at like 5.6 to solve for that, no?

[short charm]

Yeah, I just don't like the spikes from the ring 😂

[mystic loom]

I have step down rings

[short charm]

That's why I have the step downstairs on mine

And yeah, you should experiment with those cause I had very good success with those on mine

But yeah, I'd say you'll be happy with it if you grab it

[chilly ingot]

i wonder if the cine lens focus ring would take a focuser belt really nice

[mystic loom]

it looks a little wide for that but looks like it should fit under the ring system itself without drama

i have a pulley ring that came with my ring system that might need some tape shimming to fit it but that shouldn't be too dramatic

being an astrophotographer I have 900 feet of gaffers tape just lying around

[chilly ingot]

yeah i guess the cine stuff is fine. just the aperture ring needs tape

[mystic loom]

thank you for all the digging on this with me!

[chilly ingot]

its fun

also. i get to take notes when someone else points out some 200iq stuff

like @short charm with the stepdown rings having a possibility of being slightly better sharpening effect than internal blades

i do still wonder if its about the front element not perfectly corrected for the shallow angle light and stepdown rings actually work in that case better

diffration spikes suck though. reason enough

[short charm]

Nah that's a follow focus gear iirc, but there's several models for that gear to an eaf on tinkercad and other places

[short charm]

That's my thought there too, cause my lens needed to be down to 4 before matching my 58mm stepdown ring iirc

[mystic loom]

so I'm using this ring for it:

[short charm]

And yes, that's my reason lmao

[mystic loom]

the placement of that gear seems like it won't get in the way of the belt with the pulley in place

[short charm]

Yeah you can do that still, just may be right to put on that pressure fitted ring

[chilly ingot]

actually today at work i wondered if a stepdown ring and internal blades combined at same setting would give improvements

[mystic loom]

and yeah I have the pressure ring too

[chilly ingot]

just for sharpness

[mystic loom]

and i figure if there's a gap I'll just tape to fill it

but my understanding is the rest of the chassis is the same so the holder rings match up the same

[short charm]

Think that's not as helpful, as you may be reducing far too much with that combo

[mystic loom]

like an astrodymium could be used on cine or regular either way

[short charm]

That's what I think as well, just the smaller ring may get in the way when you have to slide the ring on

Keyword may

[chilly ingot]

i think its the only one that would fit good the cine

the redcat ring most definately wont fit the cine

are the rings coming back to stock though? the guy was on medical leave

found some cool dew heaters

ts-optics sell a 12v dc dewheaters with a dimmer in the cable. and its like, 50€ total

goes to a 5.5x2.1 plug. no rca thingys needed

[short charm]

Yeah but I like my PPB controlling it lol

[chilly ingot]

dont need a powerbox atm so i went with the pegasus 2 channel dewheater controller

[mystic loom]

luckily it's a hinged design so no sliding involved

[chilly ingot]

im only gonna use 2 bands max anyway

[short charm]

I was talking about the ring that has the gt2 teeth on it

[mystic loom]

oh the focuser ring?

also luckily hinged, has a screw clamp

"hinged"

[short charm]

Oh, that's good then, didn't know that it's smart like that lol

[chilly ingot]

i think the cine lens that rubber all togerher and it only has the gear for follow focus

[short charm]

I have a similar design I printed, but I'm using a nema14 cause I can connect it with the onstep driver on the oat

[short charm]

And actually that design inspired me to design a similar thing for the redcat lol

[chilly ingot]

dunno if its same diameter. but tape will solve that

[short charm]

Just use some electrical tape and that's it lol

[mystic loom]

Yeah I assume I’ll be taping it there

[chilly ingot]

my final layer was self adhesive velour and then focuser gear ring

if i had wrong settings and hit the end. it would slide

[mystic loom]

oh clever way to keep from destroying your lens hah

[chilly ingot]

it does not take much to turn the focuser

also over tightening the gear to it will make it squish

[short charm]

Also our favorite lens manufacturer branches out to make ramen that will hurt both ways

[mystic loom]

people flocking here "check my blood pressure did i get a good copy"

[mystic loom]

purchased, may the photo gods be generous

[twilit hound]

@chilly ingot I think Im gonna finally get some rings for the rokinon and try and start AP again

What pains me though is the fact it's going to now be a slower system

[gleaming flare]

Didn't you sell Roki?

[twilit hound]

no..

[gleaming flare]

Ah you still have it

[twilit hound]

I'm not allowed to sell things zegery

[chilly ingot]

Maybe roki today

[chilly ingot]

Why not some sigma action

[chilly ingot]

Roki at pickup point

[twilit hound]

impossible without go-to

[chilly ingot]

Wdym, frame at 100mm then crank it up

[twilit hound]

Its not that easy

[chilly ingot]

[twilit hound]

firstly

to move my dec axis I have to untighten and tighten the bolts that hold the camera onto the top of the mount

They're a bit flimsy and its not smooth

[chilly ingot]

Ah i see. SGP things

[twilit hound]

So if I wanted to do 100mm and zoom into 400, I'd have to get the target dead center at 100mm which is near impossible

not to mention the fact since the lens has a bit of a dark maximum aperture, short test subs show nothing but several stars

I think I would really only feel comfortable with operating it on a goto mount which I can't afford

[chilly ingot]

Leaving work now

Picking up my roki from the post

[twilit hound]

Have a good day

Oh I thought that said leaving for work sorry

[chilly ingot]

@twilit hound

[chilly ingot]

@short charm roki feels good now when fooling around with dslr's focus peaking

whole frame pops into focus at the same time

need to wait and see with stars though

[short charm]

Woot!

[chilly ingot]

UMi also cleared customs and should be traveling through EU mainland to my door finally

@mystic loom if my roki is great now. the next common method to get a good copy is sending these to a service center 😄

... if its good

[mystic loom]

wonder how much it will cost to do it out of warranty, ha

but I'm hoping that getting a used one is enough in my case

[chilly ingot]

i got 3year warranty on this

[mystic loom]

oh nice

[chilly ingot]

and the law says something like, they need to get a opportunity to fix it, As they did

if it fails, then its replaced to a new unit

if its still bad, i get money back

[mystic loom]

ohh the EU

[chilly ingot]

the faults needs to be the same i guess

but if there are multiple ones with same unit, it should be replaced etc

and the time limit to fix it is 2 weeks

EU things

[mystic loom]

i'm hopeful that with enough love and care mine will be good enough for me - if it plays too mean with my small pixels on the 533 I'll prob pick up a modded t3i and make it a dedicated unit for super wide shooting. Taking darks again would suck, but could be cool to have a dedicated dark site travel rig for wide shooting

if that still fails, I'll probably sell that and my existing medium FL scope, go hollywood and buy a redcat, lol

[chilly ingot]

i was thinking about getting a really cheap dslr

just to mod it and maybe add some cooling

[mystic loom]

it's funny how much when I got started I thought 344fl was too wide for me

turns out all I want to do is see all of rho in a single session, lol

takes so long to beat the zoom obsession out of you in this hobby

[chilly ingot]

yeah. its cool to image something inside a nebula and stuff with bigger scopes

but widefield is as awesome too

super widefield for me is troublesome. i cant resolve any dust. so the background goes into a noisy goop

[mystic loom]

I mean I have a 6" SCT I have been meaning to shape up into a zoomier shooter (it's right on the verge of what is recommended with my AM5 so have been nervous about sinking money into it yet)

[chilly ingot]

i might pack this up and go to a darker place to image widefield at orion or something

but usually its quite cold when its up

[chilly ingot]

isnt it possible to get a reducer for those to gain some speed and its probably still good for galaxies?

[mystic loom]

i'm not super into planetary nebulae yet so haven't been rushing on it

might get it collimated and ready for galaxy season

yeah they recommend under 1000 fl for FL and that's exactly what mine reduces to with celestron's .63 reducer I have

[chilly ingot]

if its too cold to carry around a 6" f4 newt i might image the galaxies around ursa major with the sigma 100-400 lens. probably too slow

past new year ursa major is like.. straight up for me

but globular clusters, definately going with the zoom lens

[mystic loom]

dont' want to push the limits of the am5 so soon after getting it, i like pretending it's basically unstoppable and nothing can phase it

don't want to break the myth just yet

have of course also considered in a few years just going insane and getting the hyperstar for it and obviating all this other stuff

but they seem fussy and annoying

[chilly ingot]

yeah. it actually sounds too good to be true

i want a C6 just because of that. having a reducer and then maaaybe getting a hyperstar for it

having to deal with a possible f2 tilt issue. keeps me up at night

[mystic loom]

they're nice middle of the ground scts, still portable

My friend has the 9.25 and while they're cool it's a LOT of scope if you don't live somewhere dark

i mean all SCTs are portable but still gets to be a lot

[chilly ingot]

i think the big aperture f2 system would be great for what i want to do

like. with this light pollution i need to image 25x more than people in b1-3/4

[mystic loom]

what is your bortle?

[chilly ingot]

8

but its gonna be 9 when the nearby houses are complete

[mystic loom]

oof

[chilly ingot]

wanting to move

remembering when i was a kid in a small town

the stars cast a shadow in winter

the place is now b4. i have a feeling it was way darker in the late 90's

like. the 4nm duoband filter that works great with f3.6. i kinda want that for this bortle

this idas is only like 12nm

[twilit hound]

@chilly ingot let me know how the rokinon is when you test it

[chilly ingot]

i will

[chilly ingot]

@twilit hound weather is being bad and unstable

[chilly ingot]

@twilit hound @short charm sending some stretched jpgs. i aimed the bright star in each corner.

the whole field might not be amazing with the corner shots, since the balcony glass might be interfering the other side

but the one where its centered should be ok

this is f2.8

with the f2 subs i had bottom left out of focus. i missed critical focus by a hair

with f2.8 i nailed it with the bathinow mask

only 0.8s subs ISO1600 24.2mpix aps-c

[chilly ingot]

f2 raw subs inc

bright star in the bottom left, i focused on that. then bright star on middle = focused on that. all f2 subs, iso is higher

the bayonet fit feels bad and i had a ef - eos-m adapter on. so double tilt. Should improve with the m48 thread's instead of bayonet

f2.8 raw's

[short charm]

Not going to be able to look tonight but can do a quick glance if you upload pngs instead?

[chilly ingot]

sec. doing the 2.8 and 2.0 middle ones quick

f2 focused middle

f2.8 focused middle

my quick setup is far from ideal on many things. but i guess this is usable with a filter on and solid mounting

@gusty rock analyze and gain +1 blurX favour

[short charm]

Maybe a tiny bit of backfocus or tilt on left side, but otherwise I'd say it's good at f2!

[chilly ingot]

subs are short tho. but ye it can do f2 with stopped down stars

the backfocus can be my astromod.

[mystic loom]

goofy question for folks who use the bayonet canon ef drawer and an asi camera : does it end up threading completely upside down if you have no add'l spacers other than the 11mm neck? if I want the drawer to point up , the camera is upside down; if camera is up, filter drawer points down inaccessibly

[cosmic marlin]

That’s just a sgp moment swsa would be easy to do

[chilly ingot]

Mine is maybe few degrees off middle and with other camera its slightly more. But upside down? No

Dead middle sucks actually, hits the guidescope when i want the slide out

[mystic loom]

Well hopefully the cine I got has just enough need of backfocus spacers that I can orient it differently lol

[chilly ingot]

Small shims do actually clock it quite abit

[mystic loom]

Yeah my 0.3 shim usually does about 90°

Other options could be getting that bayonet adapter and seeing how my blue fireball drawer I’ve had before getting this setup does

[mystic loom]

Aren’t these all threaded the same? Am I doing something wrong come to think of it?

[chilly ingot]

Think you got lucky actually

If you shim lets say, 0,5mm if you have a 1.5 filter

The drawer or cam clocks 2/3 turn

and voila, its probably great

0.3 shim for a basic 1mm thick filter is under half a turn

The thread pitch is 0.75mm

[twilit hound]

I never asked for your opinion

[chilly ingot]

@twilit hound did you look at my roki tests

astap tilt inspector is going wild with it. But i feel like is slightly better maybe

Few things i want to try though

[twilit hound]

Yeah I think it's definitely better than the old

I would keep it and just shoot with it now, maybe do f2.4 and crop the corners slightly, you'll be doing great

[uneven compass]

Thoughts? Which would you all say is better?

[twilit hound]

left

[chilly ingot]

I want to try some longer exposures and more solid mounting

[uneven compass]

You can always retake stars separately as well

[gleaming flare]

left has better contrast in the dimmer dust

[chilly ingot]

https://tenor.com/view/theyre-the-same-picture-the-office-pam-the-office-us-gif-20757621

[uneven compass]

I am determined to do well in low teir

Optimizing hard

[civic mirage]

Yo I gotta reprocess mine now dammit, Dadillo and Rust are scaring me

I wasn't incredibly happy with it to begin with.

[civic mirage]

Left I like

[mystic loom]

so I'm toying with picking up an old modded dslr as an alternative for just going much wider with a single shot than my 533 might allow and just having it as an add'l alternative

I have the option of the same model with some assurances that it has no tilt, that's still fairly desirable no? Dust is removable by the pros and probably much easier than fixing tilt?

[chilly ingot]

Its alive

Dunno if the cheapy aliexpress dewshield is good that threads on. Heater goes on well now

[mystic loom]

going to move this buster over to ask a nerd actually

[twilit hound]

custom lens hood?

[chilly ingot]

its from aliexpress for a few dollaros. threads on to the filter threads

flocked and its aluminium

[twilit hound]

[chilly ingot]

https://www.aliexpress.com/item/1005002951295231.html?spm=a2g0o.order_detail.order_detail_item.9.25ddf19c8Au1eh

its 8.42€ atm including VAT

theres also a longer version, sec

https://www.aliexpress.com/item/1005002950529585.html?spm=a2g0o.order_detail.order_detail_item.4.25ddf19c8Au1eh

10,53 with VAT

@twilit hound the william optics Z61 front cap also fits this perfectly.

[twilit hound]

very interesting

[cosmic marlin]

Didn’t ask for my opinion but u talk in a public chat, nice one, I also didn’t ask for ur arrogance :/

[uneven compass]

I have the cine personally, there is just one big big issue with it

Unless you use stop down rings, you must retake flats every time you change the apature. It's next to impossible to match it up perfectly every time, and even just a tiny miss match in the f ratio between an image and your flats will cause the flats to not properly correct

[mystic loom]

i have rings, plan on ignoring the dial entirely

[uneven compass]

Perfect, doesn't apply to you then

Where did you get your rings actually?

[mystic loom]

amazon, got a set that drops down to 26mm

[uneven compass]

76mm right?

[mystic loom]

"newks" on the side of them

77mm lol dont' tell me i need to return these lol

[uneven compass]

I don't know the exact diameter lmao

[mystic loom]

I don't see any that say 76 is an option

there is 67mm

[uneven compass]

Let me know how those work for you

[mystic loom]

they fit on the non cine i'm returning starting at 77

[uneven compass]

Then they'll work

[mystic loom]

77-72-67------>26

[uneven compass]

I would really like to 3d print some, but I don't see a model

Tbh I could probably just design one

[short charm]

I got a 77-58 ring, it's very matte, so hopefully will cause less reflections than the generic ones I got before

Haven't tested it out yet

The OAT that is housing my rig is not exactly suited to the insane temps we are having rn

[shell wasp]

lil rig pic

[shell wasp]

a stack of 15ish 2 minute f2 subs

ignore the one sub with star trailing lol

[chilly ingot]

Think ill go with 52mm at first

About f/2.6

[chilly ingot]

Insanity ocd kicking in. Getting a 77 - 52 ring and then kicking it back up with 52 - 77 to use the alu dewshield

[short charm]

I'd try the range first, then decide on a static ring tbqh

[chilly ingot]

Yeah, waiting on a good opportunity to get longer exposures on darker skies

Can see cassiopea now at like 1:30am

UMi delivery being slooow. Might try the polaris trick with just a tripod

[short charm]

Yeah I'd do that first

[chilly ingot]

Perseid this weekend though

[short charm]

All clouded out 😦

[chilly ingot]

I maaaybe get 2-3 hours tonight of clear

[twilit hound]

My stacked files are coming out so cursed

[chilly ingot]

why are so many pixels at 0 value

[uneven compass]

What are you using to stack??

That is a beyond wacky noise pattern, if that's even what it is

[chilly ingot]

@twilit hound ok what kind of calibration psycocis are you on now

can you stack with less and see how it comes out

stack with none, then bias only, bias and flats and then bias, darks, flats

use some hot pixel detect when going light on calibration

you might see what is causing it.

[twilit hound]

25 lights
20 flats
25 bias

[twilit hound]

not using darks

[twilit hound]

I am

[twilit hound]

Alright

[chilly ingot]

good darks are a waste of imaging time

[twilit hound]

Is this good?

25 lights
10 flats
12 bias

[chilly ingot]

i usually stacked with just bias only if i could not have been bothered fixing the flats

[twilit hound]

well without flats I get the weird donut gradient

[chilly ingot]

dbe it and it looked good

oh yea that one you showed

[twilit hound]

@chilly ingot

[chilly ingot]

damn.

i see no reason why those would not work good. probably some setting is off

[twilit hound]

I had every setting the same

[chilly ingot]

would you test a another stacking software?

[twilit hound]

I'm plagued with this curse that disallows me to have success in anything

It seems that way atleast, lol

[chilly ingot]

dss has been super weird for me since the update that made it fast

[twilit hound]

I am using 5.1.3, I could go back to 4.2.6

super weird in what ways?

[chilly ingot]

with my 533 data. it makes a 3008x3008 frame and the pic is in the top left corner using 1/4 of the frame

basicly shrunken

rest is black

[twilit hound]

weird

[twilit hound]

@chilly ingot

[chilly ingot]

i stacked with astap once. felt ok since it lets you stack with just bias and stuff

[chilly ingot]

use it all for now. i think the software is being weird

delete the created masterflat and masterbias so it wont use it again

just dunno how it is subtracting that much off the light frames

[twilit hound]

That's what gave the cursed result

[twilit hound]

Then wouldnt using less make sense

hence 25 lights 10 flats 12 bias

[chilly ingot]

it averages the bias, not adding up

[twilit hound]

just tell me what to do man Idk how to do this stuff anymore

[chilly ingot]

honestly. i would stack again with some other program

[twilit hound]

Ill try siril

[chilly ingot]

if thats cursed too, then its something about the data.

taking new bias with cap on is not that big of a deal

[twilit hound]

alright im stacking every file, without removing any, all in siril. you good with that?

[chilly ingot]

https://tenor.com/view/anonymous-anonymous-bites-back-geek-pepe-pepe-matrix-gif-14778477

press go

eyyy. @twilit hound damn it. the bias has some pure white pixels at the spots that turned out black in the result?

[twilit hound]

is that a question?

[chilly ingot]

im just wondering why its subtracting pixels down to zero value.

[tardy epoch]

What gain are you using? And what fstop

It kinda looks like that time I accidentally used 20 gain on a f7.5 scope with only 10s exposures

It behaved weird like that

[twilit hound]

ISO 800, f2.8

not caused by the lens. this is something in the stacking process

[tardy epoch]

Hmm maybe a light leak in the bias?

[chilly ingot]

tape down that viewfinder

if the bias is too bright, it will subtract more hardcore yea

[tardy epoch]

Bias seems to be over correcting

@twilit hound what mode are you using to stack the bias in Dss?

Maybe bias hot pixels are kept while they are removed by sigma clipping

In the lights

That’s just a guess that I’m not sure if that’s how dss works

[chilly ingot]

i was thinking too its some setting with hot pixels etc

[twilit hound]

I dont know how to stack in Siril

the tutorial just told me to use the script

[chilly ingot]

Yeh and the stock script wants darks or else it fails

astap will stack too

[twilit hound]

Im getting so many errors

[chilly ingot]

I get that too with my dslr data in siril. Some reason it turns out right

[twilit hound]

I dont know how to add the calibration files

[chilly ingot]

Are you doing this manually

The auto script needs a home folder in the root directory of the data and then you need folders: lights, flats, biases

Not bias.. biases

probably will fail since there is no darks. Dont like siril training wheels

[twilit hound]

Idk

[twilit hound]

my folder is named biases

I've never done this before sorry

when I click on the bias section to add the folder it just opens nothing

I cant hit the button to add it

[chilly ingot]

siril makes no sense to me. its a dumb program. never succeeded doing it manually and probably never will

when astap?

[twilit hound]

ill have to download it

[chilly ingot]

its just few megabytes

[twilit hound]

which do I download

[uneven compass]

Make a new folder. In that new folder, create folders called "lights" "flats" and "biases." Make sure to set the home directory to the new folder (press the home button) and run the "osc preprocessing without darks" script

[uneven compass]

You might need to download the preprocessing without darks

You don't have pix do you?

[chilly ingot]

that script is not stock isnt it

[uneven compass]

Nope

[twilit hound]

I dont have that script

[uneven compass]

It's on their website somewhere

[twilit hound]

Ill just try astap. stench recommends it

[uneven compass]

Just look it up and you'll find it. Super easy to install

What have you been using?

[twilit hound]

I was thinking that but wasn't sure with all the other options thanks

It redirects me to this @chilly ingot , I'm on the right path right

[chilly ingot]

yes click green thingy

[twilit hound]

downloading

It says blocked - dangerous but that's just chrome's issue right?

[uneven compass]

Yeah

Sourceforge things

[chilly ingot]

yeah and windows will warn you too to not run a not-signed thing

[twilit hound]

The files aren't being written in the file explorer

[chilly ingot]

allright. tinfoil hat computer. going to siril script with no darks 😂

here

[twilit hound]

it's installing

All done

you'll have to guide me with everything here stench

[chilly ingot]

found the script for siril btw

https://free-astro.org/index.php?title=Siril:scripts

OSC_Preprocessing_WithoutDark.ssf

[twilit hound]

alright, lets just do astap for now

[chilly ingot]

add bias to dark flats in astap. its the same

[twilit hound]

I dont know how to do that

nevermind I found the tabs

[civic mirage]

Ayo chilll

[chilly ingot]

PIXINSIGHT MASTERRACE

[civic mirage]

Astap is less intuitive imo

[chilly ingot]

you can add subs and literally press go if you want to

[twilit hound]

There is no bias tab

[civic mirage]

SiriL with scripts is fast and more integrated with hella more features. It's getting very close to one stop shop for processing. Not quite yet tho

[chilly ingot]

add them as dark flat

[twilit hound]

done, everything is added, now what

stack check marked images I assume

dont know if there's anything I need to do before that though

[civic mirage]

Ngl siriL would have been stacking the images already.

[twilit hound]

.-.

[chilly ingot]

its not intuitive as a first timer to do the folder structure and set home folder etc

search for custom scripts

when the actual program is not telling that anywhere

[twilit hound]

It's stacking

[civic mirage]

Also astap stacks were a lil iffy when I compared them to SiriL. But of course I could have been doing something wrong.

[civic mirage]

Oh wait did Caphe not have all calibration frames

[chilly ingot]

no.

[civic mirage]

Ahh ok

[twilit hound]

I dont shoot darks

[civic mirage]

Yea the script for preprocessing no darks is hella slow for some reason

[chilly ingot]

me neither. darks are a waste of time

[civic mirage]

Idk why but it takes way longer

[civic mirage]

I cant say the same

It saves my images

From walking noise

If I can match the temp properly

Again that DSLR life lmao

[chilly ingot]

my cam's dark current is less than the readout noise. it cant subtract anything

so it will just do damage

with light pollution noise it just changes the epic noise to a different shape of epic noise

[civic mirage]

Yea my XSi in 80 deg temps is well... Less than ideal.

[twilit hound]

Astap is eating my ram alive right now

[chilly ingot]

[civic mirage]

What cam are you using Caphe?

[twilit hound]

60d

???

How. I added all of them into the flat dark tab

It failed stacking @chilly ingot

[chilly ingot]

when are you going to burn that computer

does it need to be ran as administator or something

wanna try the siril script

[twilit hound]

Yes

[chilly ingot]

organise the data

minus darks folder. you dont have those

[twilit hound]

done

[chilly ingot]

you need to put that in program files\Siril\Scripts\

done?

[twilit hound]

still waiting for siril to boot up

It takes several minutes

[twilit hound]

im gonna have to go for a minute anyways

[chilly ingot]

then restart siril. you need to have the new script file in the directory

set home folder to the place where you sorted out the data.

find em and in this view when you see the folders. dont select any of the folders and just press open

then you run the new script in the blue script menu

i gotta get ready soon to go watch the Perseid meteor shower

[civic mirage]

When does it peak

[chilly ingot]

this weekend

sat/sunday night probably good

[twilit hound]

done done and done, doing this now

[chilly ingot]

[twilit hound]

its still working

[chilly ingot]

praise jesus

worked for me too

stack seems good

it color calibrated and stuff

[twilit hound]

this is extremely slow

it just started star registration

i started about 35 minutes ago

computer keeps freezing

Computer almost crashed

[chilly ingot]

pedal harder

ill try some untracked milkyway with my 50mm lens and dslr while at b4/5 place

2.5s subs, iso1600 or 800.. maybe f4 or 3.5 should be ok

its only nautical dark though

aiming at deneb for na neb

[twilit hound]

@chilly ingot It's done, stack is flawless

nothing was wrong with the data afterall, DSS was just being horrific

I dont know what kind of magic Siril did either but the noise straight out of the stacked file is so extremely good

[uneven compass]

Siril is so much nicer than dss

[twilit hound]

there's barely any noise

[uneven compass]

Wbpp is even better lol

[twilit hound]

what is that

[uneven compass]

Pix

[twilit hound]

oh yeah, I've seen it

I have pixinsight

[uneven compass]

I'd recommend it for final stacks, not just for testing. It can take >16 hours on large datasets

I think my 25h veil image took ~22 hours in total

[twilit hound]

Could you run this through BlurX please? I would really appreciate that. if you do do it please set it so that the stars are reduced to single 1x1 pixels, but enough so that the details are very sharp and nice
https://www.swisstransfer.com/d/10b7cf5c-9200-49d1-b08a-111c28e7a689

@chilly ingot

16 bit linear tif, BGE, PMCC, CC, WBC, SCNR, Crop

[uneven compass]

What target are you working on anyways?

[twilit hound]

North America nebula

[uneven compass]

Dslr?

[twilit hound]

Yeah, stock

It's looking very nice and clean just for being preprocessed

[uneven compass]

Nice nice

[twilit hound]

Ill make the colors much better once I'm in photoshop. Right now it looks dull and that is normal

[uneven compass]

I need to do NaN at some point lmao

[twilit hound]

The noise is really good. I like Siril stacking now, it's very subtle

I havent denoised yet

[uneven compass]

Honestly 5 hours would be plenty with duo narrowband and the 533

[twilit hound]

Easily

[uneven compass]

Yeah NaN is crazy bright

[twilit hound]

Only issue here is Ha sensitivity

Ill process it so the blues come out rather than trying to bring the reds back I think

[uneven compass]

That'll be an interesting look for sure

Probably will work quite nicely

[uneven compass]

Join the 533mc gang

[twilit hound]

It's a stock DSLR thing, Nan usually comes out blue once everything is properly calibrated, whereas the denser regions of Ha still withhold their red colors

[uneven compass]

Mhm that makes sense

There's a good bit of oiii in that region

[twilit hound]

My bad the statistics weren't showing what I thought they were gonna show

[uneven compass]

Was this taken at f2.8?

[twilit hound]

yeah. f2 is unusable

[civic mirage]

See

[chilly ingot]

@twilit hound think i missed abit on target doing untracked on while gazing for meteors

727 subs 2.5s each

[twilit hound]

I didnt know you were meteor spotting

[chilly ingot]

untracked result better than expected

[chilly ingot]

@twilit hound

[chilly ingot]

@short charm gonna try polaris ifn tonight. the lens is at 44.5mm backfocus atm. dont have the correct m48 - t2 extension for it

or should i just go with the canon 200

maybe i just slap my uv/ir cut in the drawer even though the cam has one stock

[twilit hound]

@chilly ingot DId you get my ping earlier?

[chilly ingot]

ok found it just now

[short charm]

Wait, your lens isnt an EF or Nikon mount?

[chilly ingot]

ef

its 44mm native but its 0.5 over now. im bringing extra uv/ir cut just incase

its probably 1mm thick so it it should want 44.3 now so. close enough

@twilit hound my gpu acceleration is not setup atm so this is taking a while

@twilit hound before

after

almost looks like the lens wants a extra mill of backfocus

i made two versions @twilit hound

[short charm]

What filter you using?

[mystic loom]

can I get one last guidance here? the other lens I was looking at just resent better, tracked shots -- already bought the cine but is this one better after all? This is a nikon non cine. These are 30s shots with a filter on, not sure if that changes the comparison. Are these better or are they not so good that I should go freak out and double buy? No buyers remorse but just trying to make sure I get the best for my ~300-350 out of this effort

the filter used was the "STC multi-spectra filter"

Thoughts on this one?

the f/stops are in the filenames

F2, F28, F4

these are pngs

These are the sellers pics not mine, this is another unit that came available right after I bought the cine, lol

Got to be a clinical term for Rokinon anxiety

[chilly ingot]

idk what is happening. but i think it gets worse as it got slower 😂

my roki before service would have probably looked "okay'ish" with a big pixel fullframe camera

they are both quite similar. the cine one you bought might get better with the tighter bayonet mounting the filter drawer has. Could tell from that guys sample subs it was drooping

[chilly ingot]

just sliding in a optolong uv/ir cut to extend the backfocus.

looks like the glass in that is 2mm thick

so im basicly 0.16 off

CLOSE ENOUGH

[short charm]

Yeah iirc it is 2mm, so you'll get a .6 add

Did your camera not come with some plastic spacers?

Iirc, there's a .15mm one there

[chilly ingot]

i got it used. no shims in box

[short charm]

You'll need to order some then

[chilly ingot]

i can check if i have really thin ones

got a set of plastic baader ones. think i measured these once

and these are not flat

unless the threads sqeeze em good

one really thin steel one. gotta check what it is. not in its bag

its 0.3mm

good news is. i can put the 0.3 in with the nbz. then im 0.03 off thats basicly nothing

[solid raptor]

@chilly ingot Correct me if I'm wrong but I thought when you aren't using a corrector or flattener the Backfocus didn't have to be 100% spot on?

[twilit hound]

thats so amazing thank you

[twilit hound]

It's manufactured as an EF mount and its on my Canon camera I don't see how it could be back focus, it should be correct straight from the factory right

[chilly ingot]

We all know samyang workers can drink alchohol while working

[chilly ingot]

the camera lens has its own optical design that is not the same as telescopes yeah. but still has a specified backfocus distance from the mounting flange. it has the same problems as a telescope when the backfocus is not correct

could also say that the rear lens group in the camera lens is the flattener

[chilly ingot]

so ur saying, zwo ships the cameras with these super cool shims?

[solid raptor]

Ohhh crap. So Ill get come into focus but it'll look sorta whacky?

[chilly ingot]

yeah it does the same stuff with the corners pointing the middle

or in a circle

[solid raptor]

And the backfocus is manufacturer-dependant?

[chilly ingot]

camera mount dependant with these dslr lenses

[solid raptor]

Which do you have again?

[chilly ingot]

Canon EF mount. its 44mm

[solid raptor]

Ah same

[chilly ingot]

new mirrorless camera lenses are something super short like 19 or 20mm

so they can make giga fast short lenses

atleast i guess

[solid raptor]

Where do you mount your ir cut filter?

[chilly ingot]

(we use astrocams)

zwo eos filter drawer

i got the telescope version atm sincei replaced the lenses bayonet to M48 threads

hopefully zero tilt

[solid raptor]

(so do I)

[chilly ingot]

@short charm oh no. i kinda do need to rotate the camera after a while dont i 😄

15deg per hour. hmmm. i got no scale markings for that even if i would do it every 10min for a tiny turn

[solid raptor]

Yeah I have that as well and I believe it works pretty well

@chilly ingot Ya think this is backfocus?

It appears my image isnt debayered

[chilly ingot]

F2.8 14s sub

[solid raptor]

crisp

[chilly ingot]

[chilly ingot]

My imaging failed tho

Dumb mistakes made

[shell wasp]

new image with my roki

[patent dove]

red 👍

[shell wasp]

yeah i overreded it

first few times using pix

[patent dove]

looks cool though

[shell wasp]

https://cdn.discordapp.com/attachments/587761581811695635/1139642457278140496/final.jpg

_krzy processed it better

working on this now

[patent dove]

that one does look more realistic but yours would look better to a non-astrophotographer probably cause of the colors

I usually like to do a more realistic process and then a more vibrant edit for that reason

[shell wasp]

i mean i feel like my process is just too punchy and theres like no background too

it was my first time processing in pix and doing HOO combination so at least I finished it

[patent dove]

yeah you could try just doing an inverted curve in the red channel on your current process to get a more neutral color background

[chilly ingot]

definately not enough time on this but yea. not much to do when mount has not arrived yeat

[chilly ingot]

(83mins f2.8)

[chilly ingot]

@short charm one sub is the focus with bathinov mask, second is the sub straight after

what the hell 😄

[chilly ingot]

V2

[patent dove]

reprocessed my veil, sharper and retained some more detail in the background Ha, also the red and blue look nicer I think

[civic mirage]

Ooo the reds are on point

Love it

[patent dove]

heres the whole PNG

pushed the background Ha a ton but thats my favorite part about this data lol

ok it looks completely red on one of my monitors but has some darker more neutral background areas on my other

[civic mirage]

Yea the background looks dam good

You got low tier in the bag

[mystic loom]

did you break out the channels separately and denoise them separately or all together? Just thinking if you pushed the Ha harder

[patent dove]

I think I denoised after recombining them into HOO

decided to use this one instead

[mystic loom]

The cine I got off cloudynights arrived

Was able to get the EAF belt to work with it with just a lot of gaffers tape

Turns out the surface on the focus ring that doesn’t include that geared part is exactly 1” wide so can be taped very neatly with 1” tape

Hope it looks as ok for me in shooting as it did in his test pics

[chilly ingot]

Looks good so far

[mystic loom]

@uneven compass did you infinity mod your cine? All the tutorials are for the normal one—you know which screws to pull?

[uneven compass]

Mine focused fine out of the box...

@mystic loom is the stop down ring set you bought fitting well?

[mystic loom]

Yep! Same threading!

A little fussy to seat but once on all good

[uneven compass]

Sweet!

I'm assuming you put it on the dew sheild?

[mystic loom]

oh no! it goes on the actual lens "hood" not the dew shield

like not the plastic thing

[uneven compass]

So you replaced the lens hood with the ring?

Lens hood/dew shield, I never know what to call it

[mystic loom]

Haha no in my wisdom I was going to have both on if I use the rings

The one I bought seems to have not come with / the seller lost the original hood, it has a 3d print replacement

[mystic loom]

Had a monsoon storm tonight so no testing

Not quite sure when I will get out with it, every night we’re getting clouds despite crystal clear daytime

[chilly ingot]

I did this insanity

I got a longer one too

or i can use the stock one i flocked a use the stock lens cap anyway since its stepup to 77

And ofc that hood fits the stock cap too

[mystic loom]

lol

where did you get this longer one?

[chilly ingot]

Aliexpress

Thats the short one on atm

[mystic loom]

https://www.aliexpress.us/item/3256805415759547.html?spm=a2g0o.productlist.main.5.587dChGKChGKR4&algo_pvid=4338be77-ee39-459e-a2cf-c46b4fa04081&algo_exp_id=4338be77-ee39-459e-a2cf-c46b4fa04081-2&pdp_npi=4%40dis!USD!12.30!8.98!!!12.30!!%402103224116921689596213814e7242!12000033712910408!sea!US!0!A&curPageLogUid=zVyTxFLRMSMw

are these things standard across brands? is this what I'm looking for?

[chilly ingot]

https://m.aliexpress.com/item/1005005678480225.html?spm=a2g0n.best.tabList.12.34132c259va5Ip&gps-id=msiteBestMore2Love&scm=1007.40000.326746.0&scm_id=1007.40000.326746.0&scm-url=1007.40000.326746.0&pvid=0a12fc2d-9ffa-4e58-bc71-af7691e433e9&_t=gps-id%3AmsiteBestMore2Love%2Cscm-url%3A1007.40000.326746.0%2Cpvid%3A0a12fc2d-9ffa-4e58-bc71-af7691e433e9%2Ctpp_buckets%3A668%232846%238110%23324&pdp_npi=4%40dis!EUR!7.70!4.5!!!60.07!!%402103226116921697081086123e7b88!12000034011252160!rec!FI!4564986712!&browser_id=9c9b20b3f22f425baad7de558b23b6d3&aff_trace_key=773d1c75cf6b435784b94e7315bb65d0-1692167832195-03072-UneMJZVf&aff_platform=msite&m_page_id=xbphlwauyycavjai189fd2c7d332128bf65f1afec0&gclid=CjwKCAjwxOymBhAFEiwAnodBLBm418JsHTbWI8M68xFI_nG8tDouPARKxUR8l5hSMdAHHHU1ZwEOzRoCphAQAvD_BwE

Yea filter threads are all the same

Same pitch. Just choose diameter that fits

I found a store that sold 2 lenghts

39mm and 78mm long

[mystic loom]

ohhh these screw on internally on the filter threads rather than on that external bayonet! got it

[chilly ingot]

So basicly i got 77-52 and 52-77 together and then the 77 dewshield. Dunno if its good or do i need to use a longer one

Can always go to stock hood though

But i like that with this i can fit a dew heater better

[mystic loom]

oh does that step down step up thing give you the ability to mount both the down ring and the dew shield? Having trouble visualizing it but kind of getting the idea

must have threads on both sides

[chilly ingot]

yeap

i just kick it up back to 77 to put the dewshield on

[hexed fable]

How far can I go with the f? In order to get at least 30 sec subs I was thinking to increase until f5,4 or more what do you think? 😁 thanks 😊

[patent dove]

are your step down rings down there? where do they thread on if the lens hood is threaded onto the lens? I think I might do something similar cause those lens hoods are only a dollar lmao

[mystic loom]

yeah same I'm really intrigued

also do you have a single 77 -> 48 or whatever f2.8 is, not the graduated rings? Where did you find that?

[chilly ingot]

There are two rings in there ofc

One down. One back up

[warm turret]

Hey Folks, would you say that you really need a guiding System and a go to tracker for the Roki 135mm? At the moment I just got the omegon lx3, wonderful for hiking adventures, but can something like this handle the Rokinon?

[cosmic marlin]

The swsa or sgp is more then enough u don’t need guiding unless u like really really need higher then 2min exposures but that isn’t really necessary

[winter herald]

is this a good copy of a roki lens ? 30s exposures , asking for a friend

[hazy copper]

Seems ok but hard to tell without full uncompressed resolution

[chilly ingot]

Not a successful sub

Put a 2sec self timer or something if you manually press the shutter button

[chilly ingot]

@hazy copper if you ever get a newt. Buy a 2047 studio focuser from meow. This thing blows my mind

Insane quality

[mystic loom]

Alright I landed two used rokis to test at my leisure and will sell the less good one

The second one was for a bit cheaper and I’ll admit I didn’t get sample shots of it but the seller on cn classifieds claimed next to no coma or CA at F2 with a full frame

We shall see

At this point just getting two used, testing them both, and selling one is decent peace of mind, lol

Look forward to the clouds letting up!

[chilly ingot]

Almost spat out my morning coffee.

i guess by hoarding roki's you speed up the process of finding the rarest of them all.

If you use the lens with bigger pixels all the way up to older fullframes, alot of the nasty stuff goes away

the small pixel sampling usually murders any hopes of optical quality 😄

[short charm]

Yeah I don't think I'll be using anything with less than 4.5 micron pixel size on a roki lens tbh, those lenses are really designed with that size in mind

[worthy grove]

I use the 2.9 micron of the Uranus-c with my roki and it seems fine. I did seem to get a decent copy mind

[short charm]

Mine was ok ish with 3.76 microns, but I could definitely see a tiny bit of CA

I may try again at some point with maybe a better uv/ir cut filter though

[worthy grove]

I have used both UV/ir and dual NB filters with mine. You will always get a bit of ca though

[short charm]

Not all uv/ir cut filters are the same though, I had some really bad ones at first, and NB filters at that f/2 speed are also not exactly reliable unless you have a wide bandpass or they were preshifted, and idk if I'll do NB on mine tbh 😅

[chilly ingot]

Yeah. I wonder what is better. 12nm at f2 - 2.8 or 4nm at f3.5 - 4

probably depends heavily on what bortle

[short charm]

Yup, low bortle you're fine with a wider bandpass, but I'd definitely go 4nm in a b7+

[chilly ingot]

yeah. im gonna stopdown the canon lens to image with 4nm filter i think

[patent dove]

that’s what i do

but 5nm

when i go back to school in the city, i’ll test it in high bortle too

[chilly ingot]

then the faster 12nm idas to darker skies. probs more apreture on the canon or roki

[patent dove]

but rn im in bortle 4/5 with it

[chilly ingot]

but the dark skies are also great to image the background too so, NB kinda kills it

mm yeah probably will just uv/ir cut and use dual nb for larger nebulas

.... or the dual nb is actually great for getting smaller stars

so many options

[patent dove]

f2 for faint dust, f/4 for stars

although the dust is definitely sharper stopped down

[mystic loom]

My job has a “wellness” subsidy that lets me basically reimburse 1k of hobby purchases a year so it’s not super hurting me to sit on two of them at once , haha

And I’ll be the first to admit a little OCD in this hobby , lol

[chilly ingot]

let me just suggest that to my boss

he will whipout a exel sheet or something and breaking down the annual costs and how much more needs to be sold to cover it

[mystic loom]

Lol they basically have me for life because of it - joking, or am I

Other places can give you salary but I get this without being ALLOWED to spend it on something more sensible

Lucky for me the only sport I’m interested in (what this was originally intended for before the nerds asked for things like this) is running

Definitely don’t need 1k in shoes a year

I take that back, but how many bikes can a man own in a car city , and 1k doesn’t get you much once you already own a 1k bike

So Rokinons it is lol

[chilly ingot]

my bikes are way over 1k

but i dont pay sales margin for em and usually get 17.5 - 15% off from dealer price too. then just VAT on top

@mystic loom when you find the perfecto rokinon

start spending that 1k next year for Canon 200's

[patent dove]

or wait a decade and spend it on a canon 400

[chilly ingot]

theres one used for sale incountry. Would only take 4-5years then

[mystic loom]

Hahaha

[chilly ingot]

dont worry, mines probably a red fringing model and stopping it down to 3.5 for 4nm narrowband

[mystic loom]

I think the next dumb extravagance will be offsetting the embarrassing cost of switching to mono in a year or two

[chilly ingot]

And automate it

with a flappy flat panel

lum and three channels. Then flats for each one

thank you jesus that modern sensors dont need darks too

[mystic loom]

I still keep a dark library for my 533

[chilly ingot]

has slightly less dark current than 571

[patent dove]

i’m jealous of the dragon fly array, they have 48 of them 💀

casual $600k in lenses

[short charm]

Mine has a similar program, but it's only for subscription stuffs 😦

[chilly ingot]

imagine if one of them has some CA and a another somewhere has slight tilt etc

camera lens owenership facts

no matter if its costs 10k or not

[patent dove]

especially if they use full frame cameras

[chilly ingot]

Canon 200 F2.8 10s sub

Canon 200 F3.22 10s sub (62mm ring)

Canon 200 F3.45 10s sub (58mm ring)

i was only looking at the star size when focusing for each ring

got a value of 3 for wide open polaris, 2.3 with 62mm ring and like 1.7 for 58mm ring

so that red fringing is a hair out of focus.

[civic mirage]

L glass goes crazy

[chilly ingot]

so..

think i need to go atleast one size more down to get better broadband stars

[uneven compass]

Rough process on last nights data

Probably will be getting ha

[shell wasp]

what target?

[uneven compass]

Gecko

[shell wasp]

that looks really nice, working on veil now and finishing up elephant

and i got all my guiding fixed last night so that’s cool

[uneven compass]

Sweet!

[chilly ingot]

cool target

is this mainly broadband?

been looking for a target for the 200mm around this part of the sky

[uneven compass]

My image was 7 hours of broadband data

Planning on doing some narrowband for it

I'm sure you could find a really nice framing at 200mm, this was taken with a 533mc as well

[chilly ingot]

what bortle?

[uneven compass]

4.5 or so

[chilly ingot]

Dont have alot of darkness available to get same integration time

i might just try mosaic some milkyway

[mystic loom]

Booked time at a relative dark site (B3) in January — Orion neb and Pleiades are obvi targets with the Roki (and rosette) but anything uniquely good to shoot ?

Thinking of doing IFN around m81 and Polaris

Also going to book some b1 time to do rho in June right

[uneven compass]

January is prime orion time

Let me find what I was planning on doing with the roki and 533 on orion this season

This guy

In the lambda orionis ring near Bellatrix

Lots of ha, and some sweet dark neb thrown in there as well

[solid raptor]

@mystic loom I'd do the boogeyman if I was you

[mystic loom]

provided all three nights I'll have are clear, at f2 or 2.8 think I'd have enough time to mosaic the whole orion constellation?

I've also got a canon aps-c modded I could use to do it quicker, but if the stars hold up to it my 533 is obviously preferable

site is bortle 3

m42 and horsehead are obviously bright but I don't know how long you need on the loop or the boogeyman or the thing off near rigel

looks like I could do it in 6 frames with canon at a slightly risky 15% overlap or 9 with 90% and get the thing off Rigel

This is prob a canon job I'm thinking, just don't know the tradeoff here with the higher qe