Ritchey–Chrétien enjoyers thread

[harsh matrix]

Yeah?

[vapid patio]

does your dec axis still have some friction with the clutch disingaged?

[harsh matrix]

it used to yes

i adjusted to where it didnt have so much that it wouldnt move with the clutch disengaged and with the dec unbalanced

mine was very stiff

[vapid patio]

mine has none like none so when I try to balance my scope it's impossible. But if I put the littlest friction on the clutch, it stays

mine was hyper tuned so maybe the dude messed with the clutch?

[harsh matrix]

the clutch and the engagement of the drive have no effect on whether or not there is friction with the clutch disengaged

[vapid patio]

like my other mount sky watcher gti has a good bit of friction when disengaged

[harsh matrix]

yeah exactly

it has to do with how well the dec axis is attached to the right ascension

id say if there is a point where the dec doesnt move with even a tiny bit of friction with the clutch just barely engaged, it's probably good enough

im not familiar with those celestron mounts so idk if the dec to RA meshing is something that can be adjusted/easily adjusted

[vapid patio]

ok it does a 360 if i let it go. like no matter how i have it i have no clue why

[vapid patio]

let me look it up

nope

[harsh matrix]

yeah so that means that the dude who tuned it probably had no control over this

it's just being annoying ig

[vapid patio]

@harsh matrix

i got it

i had to flip the eaf and put counter weights on it haha

[brisk swift]

What mount is that

[vapid patio]

@brisk swift Cgem

[brisk swift]

Oh

[harsh matrix]

i just realized that the mirrors in my RC havent moved, even a little bit, over the last 11 days

Maybe i lie

I think i moved the primary a week ago, but that's not it moving on its own.

[analog portal]

I haven't had to collimate mine in about a year. It was slightly off when I drove it home (6hrs in a car will do that I guess). Since then it's survived a few local trips and being taken in/out to the back deck.

[harsh matrix]

[analog portal]

I was talking to a buddy who has a 10" GSO flex tube jobbie, and he said my star spikes not aligning issue is likely due to focus rather than mirror flop 😦

[high aspen]

flirror mop

[vapid patio]

Does it move often?

[harsh matrix]

normally mine shifts after about a month

but i live in an area with frequent extreme temperature flips, huge atmospheric pressure drops on a regular basis, and I move it in and out of the house regularly

[vapid patio]

And how would I check it with that cashier eye piece thing

[harsh matrix]

considering all of those things, im happy it doesnt move more often

[harsh matrix]

cheshire?

[vapid patio]

Yeah very nice

[vapid patio]

Haha yeah

[harsh matrix]

honestly it's very hard and will only get you close but i can at least give you some pointers i think

[vapid patio]

Ok I will save you and I will watch a video

But do I need to get one of those laser things?

They are kinda pricey

[high aspen]

Cheshire?

[harsh matrix]

absolutely not

i dont use any tools to collimate mine

i collimate on a star which is easier than it sounds.

[vapid patio]

Oh cool yeah not bad

[harsh matrix]

it is confusing to get down at first though

i found watching SCT collimation videos to be a massive help

[thorny path]

I have a Cheshire for my newt

But I’d say that’s better than any laser and more than enough

[analog portal]

Indeed. Lasers only get you so far, you need to make sure the secondary mirror in a Newt is properly rotated. I learned this the hard way starting off with an f/4 system.

[harsh matrix]

I put some time off in the books for next Tuesday and Wednesday

The B3 site is looking quite promising on those nights, can't wait to experience those skies again.

I plan to shoot M104 with my RC both nights if things pan out

[frosty shard]

I had to recollimate mine, but it might be because I was testing Allen keys to see which one would fit in the mirror screws and accidentally turned it a bit too far

Idk if it was even the drop that caused the problems

[frosty shard]

But actually I just realized that this is going to be an important factor...I've only had my RC for the winter so it's been undergoing significant temperature swings

[analog portal]

That's a tough one here, very low on my horizon.

[frosty shard]

Also I take it on public transportation on a wagon on a regular basis, so I expect mine will need to be collimated more regularly

[frosty shard]

What's your latitude?

[harsh matrix]

exactly

[analog portal]

40-ish

[frosty shard]

Ah okay I'm at 43 north

Hopefully I'll have my guide cam in Soon™️

[analog portal]

I should clarify, my southern horizon is into the light dome of the b7 city glow, and that swims right through it.

it's difficult to shoot broadband below 60 degrees to the south

[frosty shard]

That sucks. M104 is one of the most luminous nearby galaxies though, so of all the galaxies to try through the light dome that's probably the one

[analog portal]

i usually go to my dad's in a bortle 4 to shoot broadband.

[frosty shard]

Worth

[analog portal]

just a few miles up the road, and he enjoys the company 🙂

[frosty shard]

I need to find a good place to shoot from - both in the city and outside of it

My dilemma though is that if I'm in Bortle 4 or lower skies, I'd rather observe visually

Solution: go with friends who have telescopes

[analog portal]

indeed!

I will often sky surf with binos while my rig (or rigs) are running

[frosty shard]

One of my friends is much more of an astrophotographer than I am, so I told him that he can shoot with my RC if he lets me use his Askar 120 APO visually

[analog portal]

a buddy has a wonderful night vision setup, so if he's along it's amazeballs

[frosty shard]

Night vision is next on my list at this point

[harsh matrix]

[frosty shard]

Especially since you get good IR transmission and no chromatic aberration in an RC

[harsh matrix]

btw my SQM-L and Oiii + H-beta filter shipped

[frosty shard]

Hell yeah

@harsh matrix do you have 2" eyepieces at all?

[harsh matrix]

I have one, a 30 mm focal length one that came with my dob

i need to get a dew heater to keep that one and my other one from fogging up while im out there

[frosty shard]

Honestly I should invest in one too

Unfortunately there's a problem I didn't realize until recently about doing that with an RC

You risk having bad baffle currents with smaller eyepieces

It just acts as a stovepipe and makes the effective seeing horrific

[harsh matrix]

oh interesting

[frosty shard]

I should be okay with my eyepiece selection though

Alternatively you can use a prism diagonal, but I'd prefer to use my mirror

[vapid patio]

@harsh matrix

I'm outside seting it up

[harsh matrix]

good luck

[vapid patio]

Why do my stars look like dots? @harsh matrix

I thought it would make spikes

[harsh matrix]

they have to be very bright to show up in short subs

if you point at Sirius you'll have your fun

[oblique sun]

or any constellation star

[vapid patio]

Heheheheeh

Yay

Stupid asiair

Glitch smh

@harsh matrix Can you hop in a call and help me rq?

[harsh matrix]

i need to check on my laundry rq but i can after

[vapid patio]

Ok just lmk I will be in a channel

[harsh matrix]

ok

i can join now

[vapid patio]

i could do 60s without guiding haha im just too good

[frosty shard]

My phone cooked on the Double Cluster tonight

[thorny path]

I don’t like the framing much

Wish I could get in closer

[analog portal]

https://tenor.com/view/lens-alicia420-gif-18200616

[harsh matrix]

[high aspen]

sombraero

[high aspen]

i could do at least 450ms

[analog portal]

Should I try it?

someone run starnet on this, or post it to the blurx request thread

[harsh matrix]

yes

[vapid patio]

i think... i think im him

[thorny path]

Omg I never heard of that one

So cool

[high aspen]

this post should be renamed to ritch cretin enjoyers thread

[brisk swift]

Nu

[high aspen]

oki :<

guys 200 days to a tracking mount

[prime sequoia]

Anyone have experience with one of these.

[vapid patio]

@harsh matrix

[harsh matrix]

[vapid patio]

It feels quite solid

[analog portal]

not me

[prime sequoia]

Are those fishing weights?

[vapid patio]

Yeahhhh

It works it works

[prime sequoia]

Love to see the jankness.

Mine is the swsa wedge as a counterweight

[oblique sun]

when i get an rc if i need a dec counterweight im not just putting a weight on there lol

that is an area that follows tracking, im using that

a dslr is going on there

[harsh matrix]

Weather may not work out at the B3 next week

Though predictions are generally unreliable >3 days in advance.

[prime sequoia]

I would worry about the mirror flop causing vibrations in the main imaging. I am sure guiding would see it. Now if you put a mirror less there you will be fine.

[oblique sun]

then id put a phone on there

phone ap isnt actually that bad

[analog portal]

make sure it's not on vibrate 😂

[harsh matrix]

My RC is still perfectly collimated

The temp plummeted like 30 degrees over the last 2 days, again.

[frosty shard]

Have you tried telling the temperature to stop plummeting

[oblique sun]

i will try and get an rc before next galaxy season, i absolutely hate collimation so this is just another reason for me to get one

[harsh matrix]

YES 😭

IT WONT STOP

[harsh matrix]

I hate collimating fast newts

When my RC loses collimation, it's only ever small adjustments I need to make.

It's not ever tear down the entire rig and collimate it all over again like it is with my newts.

It's incredibly convenient

[oblique sun]

i have a kinda fast newt, f/5

i hate it

[harsh matrix]

Like owning the sharpest refractor you can think of.

[frosty shard]

I distinctly remember an astrophoto attempt I made where my phone vibrated and all the stars came out absurdly wavy. Not sure if I deleted the image or not

[harsh matrix]

F/5 newts count as fast

[oblique sun]

the only thing im worried about with rcs is int time

big central obstruction and high f ratio

[harsh matrix]

Collimating at f/3.45 is complete hell

[frosty shard]

Big pixels (or binning) is the key. It's all about etendue

[oblique sun]

i have 2.9um pixels

but wouldnt binning get rid of the whole point of an rc?

you lose the insane sharpness

[frosty shard]

It depends on what you're imaging (and your sensor size). For some objects or types of images it's a fine tradeoff

[oblique sun]

11.2x6.3mm, imx585

but most objects i like are sharpness based

[frosty shard]

If you're looking to go deep on something like integrated flux nebulae then binning is probably the move. If you want to do planetary (nebulae) it isn't

[oblique sun]

like m51 is one of my favorite targets, and it has a bunch of fine details but also many dim bits

[frosty shard]

Either way, you'll need quite a bit of integration time, and the bigger aperture is only going to serve you better regardless of f-ratio

[harsh matrix]

If your seeing is pretty bad, and you want better SNR, binning is definitely the move

I think the 585 is quite over sampled on an RC too, so it's the perfect opportunity to do it

[oblique sun]

with bad seeing and a 0.63x reducer would it still be sharper than this?

[harsh matrix]

But you do have the color one.

Maybe you don't want to bin since you already sacrifice resolution with the bayer

[frosty shard]

What optics did you use for this image?

[oblique sun]

mono prob wont be for a year or two after the rc

[oblique sun]

150/750 newt

[harsh matrix]

Honestly, i think so

I shot this at native f/9, 1377 mm and had really bad seeing

My processing could use some work but it's still my sharpest galaxy set to date excluding my current project.

[frosty shard]

From my (limited) experience just Bayer drizzling is the best option

with OSC cams in general

[harsh matrix]

That requires dithering often enough and by enough pixels to overcome the bayer matrix though

Im pretty big brain but not that big brain

Not sure what the right amount of dithering and amount of pixels would be enough

I don't think i really overcame the matrix with my 533.

[frosty shard]

I've done this by hand with unguided exposures lol

[harsh matrix]

I'm probably just stupid in that regard then

Yo this wind needs to chill out

[frosty shard]

I definitely sacrificed some field size by dithering by too many pixels (like 50) but that is totally fine at the end of the day

[harsh matrix]

Oh jfc

My mount wouldn't settle if I dithered by more than 30 pixels.

[frosty shard]

I was doing it on my C5+ mount (manual with tracking), took 18 second exposures, and repositioned the center of the Orion Nebula every 8 or so exposures (shot with an intervalometer attached to my DSLR)

I spent two hours in the cold just monitoring everything but it was worth it

[oblique sun]

another thing, you think an eqm35 pro will be able to handle it?

[harsh matrix]

An RC6, yes, an RC8, no.

[oblique sun]

rc6 ofc

i both do not have the money or the mount for an rc8

[harsh matrix]

It will handle a reduced RC6 best, but it can just barely work at native.

[oblique sun]

guided?

[harsh matrix]

Ofc

[oblique sun]

ill be using guiding but not oag

240mm fl

[harsh matrix]

You and Shady will have to let me know how that goes

I think it would save a ton of time each night if I could guide with a guide scope instead of an OAG

[oblique sun]

whys that?

[thorny path]

I would honestly like to guide with a guide scope over OAG. I wonder if my 60mm is good enough

Idk if larger guide scopes exists

[oblique sun]

isnt oag supposed to be better

[oblique sun]

normal scope

doesnt need to be labeled as a guider

[thorny path]

In a way, but it isn’t perfect and with longer FL and slower speeds of an RC. It can complicate things

[thorny path]

Real

I’ve read of people with slower scopes struggling

[frosty shard]

Yeah, because guidescopes or their mounting may flex differently from the rest of the telescope

But I've heard of 8" RC and SCT users using guidescopes

[frosty shard]

Not sure in Veloren's case but I'm guessing it's easier to find guide stars

[oblique sun]

one of my friends uses a 9.25" sct with a guidescope and does 180s subs i thinik

[harsh matrix]

i have a hard time getting guide stars

and i cant get exposures longer than 60 seconds with my existing guide scope

[frosty shard]

I ordered the Askar 52mm Super ED so I may try both now that I'll have both

That's got 250 mm of focal length, probably not enough for a native RC8 but I'll try it regardless

[oblique sun]

how bad is your guiding

mines like 2 arcseconds

[harsh matrix]

that was with my EQM-35

and it wasnt bad

it was consistently 0.67" rms +/- 0.1" rms

[oblique sun]

oh thats great then

[frosty shard]

once I get the Starizona reducer, I'm totally guiding the guidescope with the RC though. By hand

[oblique sun]

was yours tuned?

[harsh matrix]

it was the fact that stars started trailing after 60 seconds of exposing which stopped me from going longer

[oblique sun]

i have never touched anything inside my eqm35 and i am scared to do so lol

[harsh matrix]

that's a classic sign of differential flexture

[harsh matrix]

no

but i tuned the dec over about 6 months of iterating

finally found a mix that worked, and then the RA died on me right about the time I got my AM5N

I fixed that and the mount works as expected and guides a little better than before so i cant complain too much

i do want to hypertune it to see just how smooth i can get it

[oblique sun]

well i do have a lot of time before next galaxy season

and that 2 arcsecond guiding was me with no idea what im doing guiding for the first time

[frosty shard]

Has anyone attempted to remove the dovetail tails on their RC? If so, are there any important considerations I should be aware of?

I may vinyl wrap mine

[analog portal]

the top one has been removed from mine

[frosty shard]

Do you have any issues with thermal expansion/contraction? also do you have a carbon fiber tube?

I've heard the carbon fiber ones may flex in unexpected ways with one rail removed

[analog portal]

yeah it's a CF tube

i haven't noticed any flexure, and honestly never thought about that

no issues other than having to refocus when the mirror gets significantly colder

[frosty shard]

I haven't heard clear reports on it, only speculation

[analog portal]

i no longer have the vixen one for the top, and i've never taken the losmandy off of the bottom. i wish i kept the top one though 😅

[harsh matrix]

I just wanted to experiment with other ways to remove the gradient left behind from my light pollution and I didnt want to add the Ha to encourage myself to overdenoise the image again

I added a negative for fun

this is NIRRR lol

[analog portal]

near infrared red red?

[vapid patio]

@harsh matrix

Is that the other Polaris?

[prime sequoia]

Anyone who uses a gso .75 reducer can you share a image of your scope so I can figure out the back focus.

this is the best I can get in focus, the oubjects in the background cant get in focus becuase the focuser it all the way in

[vapid patio]

You should have 80mm of backfocus

What’s your current spacing

[prime sequoia]

@vapid patio

[vapid patio]

Hm wow your quite close

Ok

Add another spacer ring somewhere in front of the reducer dont wanna mess its backspacing up

Is that a astro tech?

[brisk swift]

What cam is that

[prime sequoia]

yes

[prime sequoia]

533

[brisk swift]

zwo?

[prime sequoia]

yes

[brisk swift]

Why is it brown

[prime sequoia]

sun destroys anodizing

[brisk swift]

[prime sequoia]

the other side is still red

[prime sequoia]

what has me confused is it seams like the further objects get closer to focus as the focuser is in. Pulling it out eveyrthing goes out of focus. background tree branches go further out of focus.

where is the 80mm measured from? the front of the reducer. Maybe I have to much spacing

[vapid patio]

Back if reducer “where tou screw your camera in”

[prime sequoia]

I wonder if I have to much back focus. I am not sure where the reducer ends. I know you screw in behind it but does it take up the whole bit. Would it be from the back of the last element of glass.

[analog portal]

have you tried removing this spacer?

I have to do this for visual/planetary with my RC, as my Moonlite doesn't have enough inward travel to get into focus.

[prime sequoia]

not yet, did this over my lunch break. i work from home

messing with the eaf remote, if I pull the focuser out close objects get in focus.

so either its a issue with the back focus from the reducer or spacing in front of the focuser. What is odd my flattener was fine in this config

[analog portal]

likewise. the ccdt67 i used also didn't seem bothered by that spacer in front of the focuser.

[vapid patio]

I plan to take mine out for room for reducer and oag, i think your right he should take it out

[analog portal]

I would assume the 80mm is from the back of the reducer to the camera sensor. that's usually how correctors/reducers are designed.... usually

[prime sequoia]

based on my math at the red line I am 74mm

I did try with a 5mm after the redline but it was even worse with close focus.

[analog portal]

when you back out the focuser, do the things get more out of focus?

[prime sequoia]

yes

[analog portal]

i suspect it is that spacer on the rear of the ota then.

the CCDT67 (https://www.astro-physics.info/tech_support/accessories/photo_acc/ccdt67-27tvph.pdf) has different 'compression' for different spacing, one of the things i like about it. i often use it at .8x instead of .67x

[prime sequoia]

could I remove the nose piece I have on it and just push the reducer into the focuser?

that did not occure to me until now.

https://astromaniaoptics.com/products/astromania-2quot-2-inch-to-m48x075-adapter-for-telescope-eyepiece-lens?gQT=0&VariantsId=10556

I have something like this mounted in front of the reducer, but what is stopping me from pushing the reducer into the focuser

like an eye piece.

[analog portal]

you mean, use the compression ring to hold it in place?

[prime sequoia]

yes

[analog portal]

that could work

it might not 'square' your sensor though, sometimes those things are fickle

[prime sequoia]

at the end of the day the compression ring is aready holding it in technically

[prime sequoia]

@analog portal pushing the reducer into the focused worked.

I can fully focus on

[analog portal]

glad to hear it 🙂

[harsh matrix]

Yes

[harsh matrix]

Yes

[analog portal]

i look at my RC more than it looks at space

https://www.star.nesdis.noaa.gov/GOES/sector_band.php?sat=G16&sector=ne&band=GEOCOLOR&length=12

clouds everywhere, almost all the dang time

[harsh matrix]

😭

[frosty shard]

Imagine dealing with clouds
-# This post was made by west of the Great Lakes gang

But then again it's just too cold and windy

[harsh matrix]

I've made the observation, now that I know what I'm looking for, that right after sundown, and before all of the city lights and street lights turn on, I can see the Milky Way passing overhead, in a vary small strip of the sky at zenith.

It's an unintelligible smudge, just barely brighter than the sky around it.

Can't really see it with direct vision, only averted vision, and there's no structure.

[brisk swift]

[ripe crystal]

RC or SCT...?

[brisk swift]

RC

[oblique sun]

rc ofc

[brisk swift]

he uses a 6" RC

[harsh matrix]

RC6

[ripe crystal]

How come?

Easier to mod?

[ripe crystal]

Or for the price?

[ripe crystal]

Why?

[harsh matrix]

price and way sharper

like wayyyyyy sharper

weight too

[brisk swift]

da best of the west

[ripe crystal]

what

how

[brisk swift]

RC uses Hyperbolic mirror instead of Parabolic in normal reflectors

[harsh matrix]

^

the entire field is virtually flat with my 533

id say the resolution is equal across the field for that reason, the stars are tight all the way around the frame

they dont need corrective optics either

[ripe crystal]

I do like that factor about the RC

Bigger field

Better sampling

[harsh matrix]

no blurx or sharpening of any kind provided here

this is just the 6 inch

not reduced, that's important

the right image is NIR and the left is R, stars will be bigger in NIR because the wavelengths are longer

[ripe crystal]

I have noticed that the FWHM is bigger with the NIR filter. The image should still be sharper though right?

[harsh matrix]

yes

in general, ive been resolving some really stupidly small stuff with my RC

things that arent supposed to be possible with a scope as small as my little 6"

[ripe crystal]

Lmao noice

Beast scope

[harsh matrix]

and here's my sharpest galaxy dataset (tbh), my current project. left is NIR and right is R, no BlurX or anything but reduced this time

I got the reducer to turn this thing into a light bucket and it never fails to surprise me

I also just expose longer with the NIR filter because my camera's QE is worse in the NIR, it helps overcome the read noise, but causes the stars to grow quite a bit.

[ripe crystal]

Too sharp, put this man away

[ripe crystal]

I use the guidecam as the imaging cam hehe

Better QE in IR

Than the 533

[harsh matrix]

Just for fun, these are the globs the BAT resolved in M82, but by my RC and not doing lucky imaging

[ripe crystal]

You sacrifice a bit of sharpness for it though no?

[harsh matrix]

there's like 10+ others at least, and it DID THE EXACT SAME THING ON M81

it wasnt some kind of dumb fluke

[harsh matrix]

very little tbh

with the back spacing correct, the difference isnt very big fortunately

[ripe crystal]

This is sick

[harsh matrix]

it was noticably worse when I had a good 20+ mm too much of back space though

[ripe crystal]

20mm?!?!!!

[harsh matrix]

yeah i lost my mind when i discovered those in my data

[harsh matrix]

yeah it came with an extension tube on the back and i didnt know if it was supposed to be included in the backspace calculation or not

turns out it wasnt supposed to be included

[ripe crystal]

Mean company

Ruined some of your data

[harsh matrix]

it wasnt too bad

i probably got better signal than i meant to

[ripe crystal]

Btw here is my first IR test from just a couple days ago. Conditions were terrible

Also banding 😭

[ripe crystal]

Lmao

[harsh matrix]

well if youre using the guide camera to shoot IR, it's going to have banding

[ripe crystal]

B-but

I don’t have a mono camera

Besides the guide cam

[brisk swift]

[ripe crystal]

I need mono imx585

Very very good QE in IR

Anyways good night

I will dream about the sct vs rc war

[harsh matrix]

the bayer matrix of just about all color cameras is transparent beyond 700 nm

it basically behaves like a mono cam at those wavelengths

[ripe crystal]

Wait…

REALLY??

[harsh matrix]

yes really

[ripe crystal]

Not just the red filter?

[harsh matrix]

not just the red filter

that is correct

[ripe crystal]

Oooooo

Thank you so much

You have saved me

From further debt

[ripe crystal]

My filter filters out everything under 685nm, but I guess that’s close enough to 700?

[oblique sun]

@ripe crystal

[ripe crystal]

Yes

[oblique sun]

this is why im gonna get 850nm

[ripe crystal]

Insane

[ripe crystal]

No

From what I have heard, there is not enough emission in those further IR wavelengths

Just from what I’ve heard though

[oblique sun]

still why not have it, i can a filter for it for >$20

[ripe crystal]

Oh

Ok

Yeah definitely go for it

[ripe crystal]

Trust we will release soon ._.

[oblique sun]

when is soon

[ripe crystal]

Summer?

[oblique sun]

ragh

[ripe crystal]

Just dont spread the news

[oblique sun]

im not

[ripe crystal]

Patience my friend

[prime sequoia]

I forgot how heavy this flattener was

was also probobly overkill for my 533

[harsh matrix]

I just put my AM5N on my EQM-35 tripod

same tripod as the EQ6R I believe

hopefully guiding improves noticeably

[prime sequoia]

what did you get total error before?

I get about .88 max with my oag

[harsh matrix]

It's been around 1" rms consistently as of late

Can't tell if it's because my guide cam has been restricted to a single star due to how sparse guide stars are during galaxy season, or if it's my parameters in PHD2 not melding well with the AM5N

It was really low and very good when guiding on Rosette though

A nice 0.69" rms tops

It never gets lower than around there though and people have been able to get way lower RMS, I suspect the tripod is to blame.

[prime sequoia]

could be the tripod. or phd2 settings. I look forward to more stars now that I have the reducer.

I know technically they wont be smaller but they will be due to the wider feild of view.

I need to calculate the new focal lenght tonight when its clear.

[harsh matrix]

I think it's probably the tripod and I'm hesitant to point the finger at settings since I've been tweaking them progressively over the last month or so to no improvement.

I've observed the same thing occurring pretty much every night

Some kind of high frequency oscillation...

I keep thinking it's PE, but when I turn up the reliance on PPEC corrections, it still happens but mainly in the Dec.

My PA error last night was like, 12 seconds, something incredibly small.

[harsh matrix]

Happens occasionally in the RA too but less often.

The oscillations persisting makes me think it's the tripod since the tripod may not handle the lopsided weight of my system as well as if it was a solid steel tripod, for instance.

It's like, no matter what it does to correct a movement, it sways too far beyond the right point, regardless of how strong the guide pulse was, which tells me the tripod is leaning or flexing in that direction.

[thorny path]

I did that. I got an adapter for it

Heard it’s miles better than carbon fiber one. Not to say CS tripods are bad

Good tripod and leg spreader go a long ways from what people say

[harsh matrix]

My pier extension came with an adapter

[oblique sun]

@harsh matrix when you were limited to 60s exposures with the guidescope, was it with a 0.63x reducer?

[harsh matrix]

With and without, yes

[oblique sun]

i have slightly less focal length (750mm), but 180s seems to be fine for me

how come you ran into issues with the reducer at 60s?

[thorny path]

Y’all have same mount ?

Is this issue with high FL ?

[oblique sun]

he said its cause of differential flexture i think, but i also have a guide scope, a heavier one too, and i dont seem to have those issues

well i have issues with the guiding itself but thats different lol

[thorny path]

What’s the guide rate on your mount ?

[oblique sun]

100%

should i lower it?

im crashing out over it rn 😭

lowering it made it worse

[thorny path]

Damn bro what’s wrong with your mount

[oblique sun]

idk man

beavers works good

im probably gonna throw away 80% of these subs

like

[analog portal]

PoLaR aLiNgMeNt?

[prime sequoia]

https://media.discordapp.net/attachments/901579645365940264/1352824838892294285/image.png?ex=67df6bcf&is=67de1a4f&hm=178b0262be5d8a49eaab87e0f67e86408cf86d5abc65ebd12c9fe9cdcc5a44b2&=&format=webp&quality=lossless

its alive

went from 1370 to 1028

[analog portal]

what are you using to note those stars?

[prime sequoia]

Nina

[analog portal]

i don't get that with my settings 😦

[harsh matrix]

I think it's because it's still around 1000 mm reduced

Differential flexture doesn't really present as a problem until that 1000 mm mark

[oblique sun]

isnt it 850 reduced?

or is yours more than 1377 native

[harsh matrix]

I have a 0.67x reducer and plate solved it says i have a focal length of 1079 mm

If you look at the design of this guide scope, the one I was using, it's on a long, hallowed out support.

[oblique sun]

holy crap im actually gonna punch my mount i hate this guiding so much

[harsh matrix]

Plenty of room for it to bend around however it wants.

On a scale of microns ofc

[oblique sun]

[analog portal]

what mount?

[oblique sun]

mine isnt very secure either

its drilled into mt ysopce

[oblique sun]

eqm35 pro

[analog portal]

oh

[oblique sun]

my guide graph REFUSES to stay still

[analog portal]

guides like my gem28 often does with avg seeing

[harsh matrix]

Is it balanced well?

[oblique sun]

yes

it freely spins

[harsh matrix]

Dafuq

[oblique sun]

ive literally gotten like 4 minutes of exposure time

in the last two hours

cause every sub is trailed and shit

[analog portal]

i just noticed you seem to have some runaway in DEC

when i had that, my DEC was too tight, i had to loosen it a bit

[harsh matrix]

I got a virtually flat guide graph at 0.7" or 0.8" rms at worst with my EQM-35

[harsh matrix]

[analog portal]

(on my GEM28, my GEM45 is actually a bit too loose)

[oblique sun]

physically do smth with the mount? or loosen the clutch

[analog portal]

physically adjust the gears

[harsh matrix]

Specifically the worm gear meshing is what I had to loosen up a bit.

[analog portal]

iOptron's gem28 has some screws you can adjust to increase/decrease ... tension? whatever it's called.

[oblique sun]

i love how whenever i cancel the sub the guide graph returns to normal

then when i start it again it starts killing itself

[analog portal]

what's your exposure time for guiding?

[oblique sun]

1.5s but it is not having trouble finding a star or smth at all

[analog portal]

have you tried taking it to like, 2.5 or something a bit higher?

[oblique sun]

it just sucks at keeping that star in the center

[harsh matrix]

I always guided with 1 second exposures on my EQM-35

[analog portal]

wowzers

[oblique sun]

yes and it does nothing to fix it

[analog portal]

i seldom go below 2s

[oblique sun]

because it isnt having trouble with the view

its having trouble making corrections with the mount

[analog portal]

faster exposures sometimes lead to chasing seeing i think, could be wrong

speaking of seeing; tomorrow was forecast to be clear, now it's gone to shit... as usual.

[harsh matrix]

Correct

[oblique sun]

hasnt completely fixed it but certainly helped

doing 3s now

BRUH THE ONE SUB WHERE I GOT OK GUIDING

[thorny path]

It’s hocus focus

A plug in

[harsh matrix]

Guys

Am I cooked?

This is the SQM for my backyard

[thorny path]

Guh

[harsh matrix]

@prime sequoia so far my guiding is more stable and less twitchy since changing tripods

0.77 rms at the celestial equator which is amazing

Should be lower than this though

[harsh matrix]

It's guiding better at the celestial equator than it is near the celestial pole

Wtf

I can't get it any better than this

I don't understand

It's the shape of the guide stars FML

This is so annoying to troubleshoot.

[harsh matrix]

Went up to here after an hour and a half

[prime sequoia]

I have the .75

[ripe crystal]

Change to pec

[ripe crystal]

Dew heater?

[analog portal]

sky quality i think

[thorny path]

whats up with your guide star

[analog portal]

I can't see to be sure, but when there's a curved field, the guide stars look like crescents 😅

[frosty shard]

Even with the big chungus central obstruction, I'd say it might actually outdo my SCTs visually

At low power

[frosty shard]

That could be due to the aggressive baffling

[harsh matrix]

looked like a line

[analog portal]

hrm, i wonder if my baffles have agression

[harsh matrix]

my unfocused guide stars look like crescents too

and it makes PHD2 flip the hell out

[frosty shard]

(source: https://www.telescope-optics.net/two_mirror_telescope_aberrations.htm)

[analog portal]

i'm not sure what 70% of that means

[frosty shard]

Sorry I got distracted

On the lower right you can see the ray traces for light entering a baffled RC at different angles

Green rays make it all the way through

Red rays are blocked by the baffles

[analog portal]

ah so that's what the angle numbers mean

[bronze wigeon]

im a newt user so cant post a pic here but i got them without lucky imaging too

[ripe crystal]

with IR?

[bronze wigeon]

No. Visible light

[frosty shard]

Lol post your pic here

[bronze wigeon]

gotta find it, wait

[ripe crystal]

we have been waiting

but our patience is running short

[bronze wigeon]

I FOUND IT

[ripe crystal]

so i can post sct pics 😼

[ripe crystal]

what in the incredible seeing

thats a little sharp

[bronze wigeon]

i definitely had a better version

[bronze wigeon]

0.3"/px so seeing is my only challenge

[ripe crystal]

yo same

you have that with a newt...?

[bronze wigeon]

yes

[ripe crystal]

how big is the beast?

[bronze wigeon]

10 incher

254/1000

[ripe crystal]

nice!

what camera?

[bronze wigeon]

QHY5III715c

[ripe crystal]

mmmm interesting, good camera

sensitive in IR

[bronze wigeon]

Very.

[ripe crystal]

Do you have an IR filter?

[bronze wigeon]

Yes. an IR850, still havent used it

[prime sequoia]

2.5 hours last night

[harsh matrix]

ayyyy that's quite nice

[prime sequoia]

I really like this RC now that its effectivly a f6.77

[harsh matrix]

they turn into super speed light buckets with a reducer

with very little compromise to sharpness or resolution

very much worth it

second pass on my full M63 data

[ripe crystal]

that is what I call VERY noice h-a

[harsh matrix]

You like it?

Near bortle 7 tonight

[thorny path]

What is that ?

[harsh matrix]

SQM reading

[thorny path]

Btw

I’m messing with mount and guiding

The whole 0.1 min mo does more harm than good it seems

[harsh matrix]

yes

[thorny path]

I was having guiding issues and people said it was flexure

[harsh matrix]

i keep mine around 0.2 to 0.26

[thorny path]

And I need OAG. I changed settings and I got good guiding now

[harsh matrix]

so do you need an OAG?

or is that just what people said you needed?

[thorny path]

No lol

People say I needed one

Cause of guiding issues I was having

Numbers were good image wasn’t

[harsh matrix]

Yeah that's a correct assessment then

i found out i needed an OAG when i had superb guiding numbers and trailed subs

[brisk swift]

I heard the gso rcs have baffling issues

[harsh matrix]

finally getting good numbers lol

[harsh matrix]

the first generation of them had a baffle tube that was too short, allowing stray light to enter the optical path with ease

none of the later models have that issue though

[thorny path]

messing with guide settings and cant seem to get low exposures to work

they seemingly chase seeing and hallucinate errors. resulting in my imaging camera having bad image

setting it at 2 seconds fixes it

but not sure if this is too slow for my mount

[harsh matrix]

that looks really good

[harsh matrix]

im guiding at 2 secs rn

honestly it depends on what the periodic error is

mine with my AM5N is extremely low

if your's is also very low you can get away with it

Guys I think I made another banger.

[brisk swift]

how do I check which model they sellin

[harsh matrix]

If it's a retailer, they won't have the old versions

If it's on the used market, you can't tell just off looks alone.

I think only the GSO named models had that issue, and the rebrands did not.

[brisk swift]

they sellin gso models ;-;

[harsh matrix]

New or used?

[brisk swift]

ye they are gonna restock so idts it's gonna be the old model

[brisk swift]

newt

new*

[harsh matrix]

It won't have that particular defect then

[brisk swift]

[ripe crystal]

Ilikeitalot

[ripe crystal]

Too good

Ban him to the shadow realm

[frosty shard]

What is this (aside from being fire)

[frosty shard]

I will say – overall, modern RCs mop the floor with similar SCTs in terms of stray light reduction. The baffling does its job very well.

[brisk swift]

how are losmandy g11 mount?

it's cheaper than cem70

[harsh matrix]

i believe losmandy mounts are really good

[harsh matrix]

Sword said I could at least get TPN on AB but I dont think it will get that far with how noisy it is

[frosty shard]

yeah I have no firsthand experience with Losmandy mounts, but they're often considered a standard for mount quality

[harsh matrix]

i may make a copy of that version of the image and do another pass of NR before I submit it

[brisk swift]

mhm

man I'm so confused rn

I think I need time, I'll maybe explore everything and buy my rig after a few months

I don't wanna rush into this and get something useless

[harsh matrix]

definitely a good idea

[frosty shard]

Yeah, definitely take your time. I still haven't pulled the trigger on an astrocam yet lol

[brisk swift]

I'm waiting for touptek cams to get in stock

their 2600mm is really good and cheaper than zwo

[frosty shard]

Me waiting for my guide cam to ship

[harsh matrix]

there's absolutely some kind of flexture with the RC's though

my collimation is dead on but here you can tell the stars are deformed and tilt is introduced

I think this is for sure that weight on the primary being a nuisance at extreme declinations

[frosty shard]

What altitude was the Lagoon Nebula when you shot it?

[harsh matrix]

30 degrees

[brisk swift]

It's visible on like the cornerd only tho

corners

[harsh matrix]

it maxes out at about 32 and a half degrees

[brisk swift]

bottom right and top right

[harsh matrix]

the stars have become triangles too

[brisk swift]

[harsh matrix]

normally that means pinched optics

in this case, that's exactly not what the issue is lmao

[brisk swift]

that's what I was thinking

Carbon otas has less chances of pinched optics?

[frosty shard]

Yes, due to less thermal expansion/contraction. But regardless, the cause may just be collimation screws that are too tight

[brisk swift]

Mhm

[harsh matrix]

if it's happening at extreme dec angles vs not at normal dec angles, im hesistant to agree

[brisk swift]

[frosty shard]

In your case, yes – I just mean in general

[harsh matrix]

oh

these are single stars on the last M101 subs of the night

[brisk swift]

it's a triangular shaped star

like a oni-giri

[harsh matrix]

ive been having guiding issues and i think those have been masking pinched optics perhaps...

fmlllllll lol

[frosty shard]

You're accounting for the star shape artifacts due to baffling and astigmatism I've mentioned before, right?

[harsh matrix]

this is dead center of the optical path

should not be affected by the baffle tube

[frosty shard]

Ah, okay

[brisk swift]

maybe it's the primary mirror like uh expanding due to the mirror holder expanding or sumthin

same thing happened to rory

in his betty video

[harsh matrix]

i think it does have something to do with the way the primary mirror is mounted

it's not incredibly likely that this is being caused by my secondary because i worked pretty hard to not let the scondary be pinched

[brisk swift]

if it was the secondary it would have been a lot more visible in the center tho

[harsh matrix]

still really bad tbh

that Ha star is

[brisk swift]

it's kinda a square

[harsh matrix]

i think it's temperature based and has something to do with the way the primary is held in place and how the lock screws interact with the primary mirror holder...

[brisk swift]

what I said

just pour hot water on it constantly to keep it warm ( I'm joking)

[harsh matrix]

😭

[brisk swift]

I think it's due to the fact CF cools down slower than the mirror holder?

what's the mirror holder made up of

[harsh matrix]

i have no clue

i havent been able to dig up much information about the primary mirror holder, how it's mounted, etc.

[brisk swift]

It's definitely not CF

the difference in cooling rate may cause pinched optics

[harsh matrix]

the primary mirror cell itself, at least the shell of it, is steel I think.

Some kind of sturdy, rock solid, metal.

there is a significant amount of space between the outer bounds of the primary and the CF tube, so if youre saying the tube itself is constricting the primary, that is not correct.

[brisk swift]

I didn't know there was space

[harsh matrix]

it's probably the rate of cooling of the glass of the mirror vs the rate of cooling of the material the primary holder is made from

[harsh matrix]

yes lots

[brisk swift]

that's what happened to rory's betty I think

how are u gonna fix it

[harsh matrix]

im not

[brisk swift]

[harsh matrix]

im good as fuqed if that's the case

ill need to do some research to see if there are options

[brisk swift]

100x sharper than sct vs 99x sharper than sct

what's the difference

[harsh matrix]

I did some extra noise reduction on here, pretty light pass.

i think ill submit this one to AB IOTD

[thorny path]

Yooo

[harsh matrix]

oh snap wait

this version is even better than the first

https://app.astrobin.com/i/rmmj5b?r=0

blink through the original and this one and it looks so much better lmao

yeah this one is on par with my pillars of creation

holy fuq

[thorny path]

i can get .8 rms with 2 sec exposures

but shorter exposures i get better numbers. at the same time short expousures seemingly just chase seeing

unless im missing something

and numbers can be improved

[ripe crystal]

Juicy

[ripe crystal]

Why no IR?

[harsh matrix]

i didnt want to for this project

i wanted a classic SHO image

[harsh matrix]

how smooth is the graph with 2 sec exposures?

mine was unironically flat after i went to 2 secs last night

after having issues with it being super jagged beforehand

@ 1.5s guide exposures

[thorny path]

mine flattened out

i got better numbers at 1.5 sec

but as i said, the image would say other wise

[harsh matrix]

right

does the image get worse with sub length?

have you inspected that?

[thorny path]

i was doing 3 min subs and they would be little eggs

i have guide scoped aligned

[harsh matrix]

did you try shorter subs?

[thorny path]

i believe its over correcting

[thorny path]

not yet

been testing on 3 min subs

only turns out good at 2 sec exposure on guide cam

[harsh matrix]

if it's differential flexture, 3 minutes is too long if your stars are eggs

[thorny path]

ill look into that aswell

something tells me it isnt

but ill look into that, ill try shorter subs and see if it goes away

[harsh matrix]

at least try shorter subs because that will eliminate diff flexture if that truly is the problem

[thorny path]

they say an OAG is the solution

you have one right ?

[harsh matrix]

correct

[thorny path]

wait with an oag you dont have flexure ?

do you get better numbers ?

[harsh matrix]

indeed

[harsh matrix]

about the same numbers

guide graph is still flat too

[thorny path]

mmm

imma have to conider that heavily if i cant fix this

[harsh matrix]

yes

[thorny path]

You know if my 462 would be good ?

For an OAG ?

I’ll also put it behind that .75 reducer

[harsh matrix]

on your 150P, should be fine

on an RC, not sure, been wondering that myself

M101

3 hours, 1 per color

[vapid patio]

GOOD LORD I ORDERED MY OAG ON THURDAY AND IT SAYS IT GONNA GET HERE IN A WEEK

RC 6 8hr

i need to run it through SFS i think i had some.... odd frames in there

[harsh matrix]

holy fuq

[harsh matrix]

for sure

[vapid patio]

good or bad?

holy fuq can go both ways

[harsh matrix]

id be a little careful with BX because it's really good at overcooking galaxies in RC data

im finding that out the hard way atm

[harsh matrix]

i mean, good

looks like collimation is dead on, and it's very sharp

dont really need BX to tell that

[vapid patio]

and the scope has been sitting for a year haha

[harsh matrix]

also whatever denoiser you are using seems to be hallucinating

in the background

[vapid patio]

how so?

let me look

[harsh matrix]

that'll resolve itself with more data or just less denoise strength

this stuff

[vapid patio]

oh yeah that whoops

[harsh matrix]

the "light worm" looking things

[vapid patio]

its a more data thing

[harsh matrix]

yeah for sure

[vapid patio]

and sometimes BlurX thinks its a star and makes it more prominent

thats a bluX after noiseX thing

[harsh matrix]

NOOOOOO

do BlurX before NoiseX

it's not working correctly if you do it after

and do BlurX after color calibration because BlurX can mess up the color balance if you do it before color calibration

looks like a very juicy first run with the RC though

that looks really exciting

[vapid patio]

i know that bluX after can mess it up. sometimes at the end i run it one more time to let it sharpen everything up a little more once ive done all my sutff

just didnt see that it did that to the background

[vapid patio]

thanks! plan to do more time on m81 then move to Koi galaxy or m51

[harsh matrix]

BlurX multiple times does mess up quite a bit

RC data, given the data was sharp out of the gate, doesnt need much BlurX'ing im finding out

at least for galaxies

[analog portal]

could i take a crack at this astonishing data?

[vapid patio]

of course!

[vapid patio]

true being super oversampled doesnt help much either

[analog portal]

i struggle with this, m33, and m101 getting the faint arms to pop

[vapid patio]

i just ran it thorugh sfs so give me one sec to see if it make and differnce

[analog portal]

kk

[vapid patio]

https://drive.google.com/drive/folders/18bsoM3HgbjZ9K6DelGh9Rm5S9RLaO0eT?usp=drive_link

@analog portal its the one that i named in t here

[analog portal]

ty so much

[brisk swift]

how do I get the backspace right of a RC @harsh matrix

[harsh matrix]

not hard

add a spacer, and then rack the focuser in and out until you reach focus

[brisk swift]

don't I gotta buy back space thingy

[harsh matrix]

what back space thingy?

they come with the proper extension tubes included to reach back focus

[brisk swift]

spacer

[harsh matrix]

the proper rings come included

[brisk swift]

Are they called extension tubes?

[harsh matrix]

yes

[brisk swift]

ah

Will Qhy OAG work with zwo cams?

if I use a oag I need to calc the backfocus again

[harsh matrix]

only if you use a reducer

[harsh matrix]

that's complicated

they arent a simple thread on and call it a day solution

[analog portal]

@vapid patio I definitely didn't handle the stars as well as you did. 😅 This was super clean data.

[vapid patio]

Dude WHAT THATS SO MUCH BETTER

Whats your workflow

Roughly

[analog portal]

plate solve, spcc, soft histogram stretch, remove stars, further stretch starless in histogram, run hdrmultiscale transform (i think that's what it's called) to reduce highlights in the core, noiseX, range mask to add color/saturation to the galaxy. then put a range mask on the stars to increase saturation w/o messing the cores too much. recombine, run blurX with non-steller reduced down to .10 or something? sharpening stars at .20

[harsh matrix]

not bad

[analog portal]

oh and before adding stars back, i did a 'dark structure enhance' to bring out the dust around the core a bit more

[harsh matrix]

the hdr multiscale cooked the dust lane nearest to the core though

[analog portal]

the data was cleaner than i'm used to, so i forgot about gradient (there isn't much of one anyway)

i probably could've ran blurx first before starx, to keep those two bright stars from washing into each other

[vapid patio]

Hmm very simple

I never did hdr multiscale yet with my rc6 i will try

[vapid patio]

I usally run GraXpert anyways

[analog portal]

i've seen people post their workflows on youtube and they use about 10 additional processes/scripts than i do, some i didn't even know existed, and the end result looks like a 256bit color graphic from windows xp

[vapid patio]

Real ✅

[analog portal]

"we're gonna color mask this, linear fit that, extract lum here, clone heal this, etc etc"

[vapid patio]

Clone heal? 😭

Yeah people be doing too much

[analog portal]

i saw a guy doing that to get rid of amp glow artifacts 😭

[vapid patio]

Dark frames where you at 💔

[analog portal]

oh he used them

[harsh matrix]

im also a certified HDR multiscale transform hater

so there's that

[analog portal]

i think he used a 10min sub dark for a 5min sub light, and he had dark black lines

subtracted too much

there's some real pixelmath ninjas who look like they're solving quantum physics with their formulas. some real Good Will Hunting stuff lol.

[harsh matrix]

btw

BlurX PSA

and this is correct

this was how Russ Croman intended for it to be used

[vapid patio]

I would not be following that workflow 😭

[thorny path]

SCT users didn’t get the memo

[ripe crystal]

erm

excuse me

what are you saying about SCT users?

[thorny path]

Strange phenomenon on Astro bin

Of people abusing blurx

[frosty shard]

RC's going to a dark sky site tonight

[ripe crystal]

Yeah ok fair enough

[coral fog]

What does that mean?

[harsh matrix]

[harsh matrix]

You use BlurX once, near the beginning of processing and never again

[coral fog]

People use it twice?

Or do u mean the beginning of learning processing

I don’t rlly understand srry

[harsh matrix]

People use it twice on the same image during processing of an image.

[coral fog]

Wtf

How does that even work

☠️

[harsh matrix]

It doesn't

Makes BlurX hallucinate pretty badly

[coral fog]

Lmao

Topaz denoise ahh

[ripe crystal]

Showshowshow!!!

[harsh matrix]

look for Barnard's Loop while you're at it

[harsh matrix]

@thorny path 2 second guide exposures are working very well

I'm a bit surprised.

[thorny path]

Real

I got a good guide graph at that exposure time

I ordered an OAG

I wanna say it’s more due to the mounts PE

Everything on my guide scope seems good

And a lot of people mention never figuring out their issue with flexure

[harsh matrix]

did you ever test say 60 second exposures vs 180 second?

[thorny path]

I was doing 3 and then 5

I got good stars at 2second exposures on guide cam

At 1.5. It would all go to shit

I think it would be best to use the main imaging scope to guide for these mounts since constant correction is needed

[harsh matrix]

that sounds more like chasing the seeing but with a guide scope, at least a moderate focal length one, i wouldnt expect that to be much of an issue...

[harsh matrix]

that's a reasonable assumption

did your mount come with a periodic error test report?

[thorny path]

It didn’t

[harsh matrix]

ugh wtf

yeah youre swinging in the dark then

are you using hysteresis or PPEC as your correction algorithm?

[thorny path]

I think I can do my own but it does seem it’s around 10 arc seconds

I’m using PPEC

[harsh matrix]

good

[thorny path]

At 2 sec is good but as I said, one needs constant correction so imma get an OAG

I really like the mount. Light and portable and I can set up so quickly

[harsh matrix]

shouldnt be periodic error then unless you arent using a high enough prediction weight

[thorny path]

Hmmm

[harsh matrix]

this is my guiding rn

clouds...

[thorny path]

With the RC?

[harsh matrix]

yup

it really like to try to guide on noise

i need that Xena M asap

[thorny path]

Imagine it just locks onto a pixel

[harsh matrix]

that's what it's doing there lol

[thorny path]

💀

I’ll see how it goes with the OAG. I think it will work out great

[harsh matrix]

im just going to park it and wait out the clouds hopefully

[frosty shard]

Unfortunately it was too late to do that when we got here, but I just bagged ALL of Markarian's Chain.

[harsh matrix]

LOOK AT M101 and M104

if youre there until the milky way core rises, look at lagoon and Sagittarius star cloud too

maybe challenge yourself and look for something much more difficult

say the Leo Quartet, or the Mice, or the Antennae galaxies

[frosty shard]

Coma Cluster galaxies are up next

[frosty shard]

I could see spiral structure in M101

[harsh matrix]

Holy fuq

I don't recall if I could or not

I probably didn't because I was being really bad about not letting my eyes dark adapt

Got another near B7 reading...

[thorny path]

i just got the starizona coma corrector

it has a cool box

and the glass elements look so clear

strange

[harsh matrix]

tell me how it goes

that's the 0.75x right?