Ritchey–Chrétien enjoyers thread

[stiff mason]

Let me just list you some places where CaF2 is used first off we got the very famous takahashi I'm sure you heard of them before and how their telescopes are extremely sharp sharper than any reflector second we got canons extra low dispersion lenses which use CaF2 to achieve zero chromatic aberration then we got Nikon NIKKOR Vixen FL Baader Planetarium so saying CaF2 is only used for sensor windows is the dumbest shit ive heard all day long

[slate falcon]

whats a takahashi?

[sinful sapphire]

https://tenor.com/view/ishowspeed-yuorki-egyptian-speed-funny-gif-6210991462615795229

[stiff mason]

Yeah what's a takahashi only the best ever refractor brand ever

[frosty shard]

CURSE OF RA 𓀀 𓀁 𓀂 𓀃 𓀄 𓀅 𓀆 𓀇 𓀈 𓀉 𓀊 𓀋 𓀌 𓀍 𓀎 𓀏 𓀐 𓀑 𓀒 𓀓 𓀔 𓀕 𓀖 𓀗 𓀘 𓀙 𓀚 𓀛 𓀜 𓀝 𓀞 𓀟 𓀠 𓀡 𓀢 𓀣 𓀤 𓀥 𓀦 𓀧 𓀨 𓀩 𓀪 𓀫 𓀬 𓀭 𓀮 𓀯 𓀰 𓀱 𓀲 𓀳 𓀴 𓀵 𓀶 𓀷 𓀸 𓀹 𓀺 𓀻 𓀼 𓀽 𓀾 𓀿 𓁀 𓁁 𓁂 𓁃 𓁄 𓁅 𓁆 𓁇 𓁈 𓁉 𓁊 𓁋 𓁌 𓁍 𓁎 𓁏 𓁐 𓁑 𓀄 𓀅 𓀆

[stiff mason]

[scenic mist]

Well

[sinful sapphire]

1. Still a combination of different Glas types
2. No such thing as Zero chromatic aberration with refractive Elements
3. i didn’t say only, I said usually. 🗿

[scenic mist]

Its reducing it

Not preventing it

Didnt realize you said prevent

[sinful sapphire]

He has no clue what he’s talking about

[frosty shard]

A singlet made with low dispersion glass has unacceptable chromatic aberration on its own - otherwise we'd use singlets

[sinful sapphire]

This smells like AI again

[slate falcon]

reduced by a few micron

[stiff mason]

Prevent

To prevent means to stop or keep something from happening, or to hold someone back from doing something. It involves taking advance action or precautions to avoid an unwanted outcome

[sinful sapphire]

It doesn’t prevent CA.

It reduces it.

[frosty shard]

Source: my eyeglasses (I would sacrifice children to have custom doublet eyeglasses made for myself)

[slate falcon]

hey i will say, ed singlets are decent for corrector plates in the focus tube as long as it doesnt change the fl too much

[scenic mist]

Well its taking advance action to avoid an unwanted outcome

[sinful sapphire]

You trying to tell me about optical design while thinking that low dispersion Glass prevents CA is just…

[frosty shard]

Yes that's true it's why SCTs and Maks are viable optical designs

[stiff mason]

To reduce would mean it's fixing already exiting CA

Which it's not

[sinful sapphire]

Let me rephrase, it has less Dispersion than normal Glass

Also this Logic can be Applied to you too

To prevent CA there has to be CA

[stiff mason]

It prevents CA from happening in the first place with some residual remaining which can easily be fixed in a doublet or triplet

[frosty shard]

@slate falcon actually I wonder...would you be able to design me some doublet eyeglasses lmao

[sinful sapphire]

No it doesn’t

[slate falcon]

wrong reptl

sorry

[slate falcon]

[sinful sapphire]

Low Dispersion Glass is just that. Glass with a lower Dispersion.

[sinful sapphire]

It’s just a property of the material.

[stiff mason]

Here take a look in here see if you can find me an image with ca https://app.astrobin.com/equipment/explorer/telescope/360/takahashi-fc-100df

[sinful sapphire]

It’s the Geometry working together in lenses along with the different refractive Index and Dispersion coefficient

[sinful sapphire]

https://cdn.discordapp.com/attachments/1090672324195401881/1275445030127013981/rating.gif

[stiff mason]

Its a doublet btw

[sinful sapphire]

Found a lot sir

[stiff mason]

Show

[sinful sapphire]

(A lot of Images)

[sinful sapphire]

Every Image with coloured Stars

Look for yourself. The colour isn’t equal in every Star

[stiff mason]

Enlighten me

Imagine i dont have access to the link

[sinful sapphire]

https://app.astrobin.com/i/y77ucc

[slate falcon]

all of it is overuse of bxt

[frosty shard]

You can see it here
https://app.astrobin.com/equipment/explorer/telescope/360/takahashi-fc-100df?i=jtsy5p

[stiff mason]

Just looks bloated

[slate falcon]

youch

[stiff mason]

A little yeah

[sinful sapphire]

If you can’t See the CA in those Stars i am really concerned on why youre arguing on this topic

[scenic mist]

Its blue and red

[frosty shard]

I mean in the grand scheme of things it's minor but you can tell that you have chromatic aberration (specifically chromatic astigmatism)

[sinful sapphire]

On some Stars it’s purplish and some have Green

[slate falcon]

https://app.astrobin.com/equipment/explorer/telescope/360/takahashi-fc-100df?i=udi8uh

this is so woronow

[stiff mason]

Oh yeah

[frosty shard]

Though the fairest test is with raw data and not processed images

[slate falcon]

they all use too much bxt

[sinful sapphire]

Also just saying

It also has two different glass types

[stiff mason]

Since when could blurx fix CA

[sinful sapphire]

🗿

atp im convinced youre trolling

[stiff mason]

In fairness ive never had data with CA so cut me some slack

[frosty shard]

You just treat each image channel separately to remove the aberrations produced in each bandpass

[stiff mason]

Yes ik that can fix it

But blurx

[sinful sapphire]

BlurX is a deconvolution Tool with a Star correction Feature

This Star correction supresses distortions which partly include CA

[frosty shard]

I would guess it's been trained with data from refractors, though of course there's no technical details provided so who knows

[slate falcon]

hubbl data

[frosty shard]

has the RC who must not be named disclosed this?

tbh I kinda don't trust him, he seems to have given conflicting details about BlurX in the past

[sinful sapphire]

going back to the original topic

[harsh matrix]

[sinful sapphire]

Using Flourite in a corrector doesn’t change that surpressing CA over a really large spectrum SUCKS to do and needs many Elements

[stiff mason]

Ok fine just use a 3rd mirror

[slate falcon]

nah

[stiff mason]

To correct aberrations

[sinful sapphire]

That’s what is being done anyway

But a Big RC corrects aberrations well enough

[slate falcon]

mr scientology foesnt eant peoplr to know how it works

[sinful sapphire]

While being cost effective and easy to collimate compared to a 3 mirror System

[tight lodge]

What?😭

[stiff mason]

Yes but you can also use the 3rd mirror to reduce your f stop

[sinful sapphire]

I’d like to know which third Mirror you’d be using to do that

[stiff mason]

Concave mirror

[sinful sapphire]

… the shaping

just putting another Mirror won’t help you

All surfaces need to work in synergy

Can’t just add another mirror

[harsh matrix]

I cant help but feel like someone here is taking the obviously incorrect side of things just to hold an opinion that is different from the rest.

aka

trolling

[slate falcon]

well tbh, you can add a 3rd mirror, the chance it helps is minimal and it will double your coma

unless you make every mirror work together

[tight lodge]

Just make a schiefspiegler telescope

[stiff mason]

Well a shape that perfectly cancels your astigmatism

[stiff mason]

Literally jwts uses it vera c rubin uses it

And so many more

[slate falcon]

you would need 3 non parabolic mirrors for that

assuming you are using any standard scope you canmot just add a third mirror

you would have to reshape every mirror in the sustem

[slate falcon]

blurx guy doesnt want people to know how blurx works and what data he used

[harsh matrix]

kind of makes sense since it's a paid product and all

but I understand what makes it frustrating

[tight lodge]

If it works, it works

[stiff mason]

No you just need a mirror that has the opposite aberration to your main system

[slate falcon]

false :(

[slate falcon]

[slate falcon]

if that were true this would be a three mirror astigmat

[stiff mason]

True the mirror needs to be a rotationally symmetric asphere specifically, a hyperbola or a high-order polynomial asphere.

[slate falcon]

that would only correct on axis

[stiff mason]

Also thats not the design

[slate falcon]

you need each mirror to work in unison to actually correct the field

[slate falcon]

thats 3 mirrors no?

[slate falcon]

EWC ONE IF THOSE MITTORS IS MADE TO WORK EITH EACHOER ALONE THEY DONT WORK AS A SCOPE

this has to be ragebait

this has to be

[harsh matrix]

listen

I tried to warn everyone

[harsh matrix]

^

[stiff mason]

Yeah no idea what you're saying

[tight lodge]

Grab some popcorn brother

[slate falcon]

i got an english exam in 30 mins

its like 2.5 hours long

[harsh matrix]

https://tenor.com/view/cat-stare-sleepy-gif-9558558281283765110

[sinful sapphire]

that’s Not how that works

[tight lodge]

Lots of f-words on one day

[harsh matrix]

[sinful sapphire]

And a lot of lost braincells

[frosty flicker]

yooo someone apart from me is posting stupid funny images

[harsh matrix]

I think this meme format is hilarious

[stiff mason]

Also this is the definition of the mirrors needing to work in unison

[harsh matrix]

this is probably one of my favorites

[tight lodge]

It worked for hubble... but I understand the circumstances were different

[harsh matrix]

I already sent the Esprit one to a SQA, Esprit and SCT user I know

[slate falcon]

failing my eng lit paper two bc of this

[stiff mason]

Idk to me it just seems like you guys are taking the opposite side just to spite me

[frosty flicker]

https://klipy.com/gifs/my-beloved-my-beloved-my-beloved-1--k01KRZHWF11MHREVG2CGS1K5RY5

[frosty shard]

needs more recursion

[harsh matrix]

brought to you by the pure reflector club (Ritchey Chretien cult)

[stiff mason]

Whats 1-1

[slate falcon]

try optics and you will immediatly know its notthing like that

it feels like 1-1 = 5 half the time

[stiff mason]

Whats

[slate falcon]

istg

[tight lodge]

Wait until he finds out that light don't behave like a particle

[stiff mason]

Literally how light behaves idk what to tell you

[sinful sapphire]

You‘re so confident on wrong things its honestly admireable

[stiff mason]

This gotta be rage bate

Right below it too 😭😭😭

[stiff mason]

Whats this right here

[frosty shard]

The Ritchey–Chrétien is a perfect example of this. You don't get optimal performance by using a parabolic mirror (which has no spherical aberration) and pairing it with a hyperbolic mirror with the proper foci. You have to induce spherical aberration on the primary and cancel it with the secondary to get optimal performance

[tight lodge]

That's phase interference. Soundwaves do it too

[slate falcon]

now add an extra mirror with that design, if you make it correct on axis will it correct off axis or will it make it worse?

[sinful sapphire]

I can’t believe UNID is still trying to argue about Optical Design with what comments he gave already

[stiff mason]

https://tenor.com/view/i-guess-bro-yuji-gif-1618853709294231343

[slate falcon]

we are letting him tbh

[slate falcon]

tbh you can make a sound telescopce

[tight lodge]

Yeah... it's called parabolic microphone 😂

[frosty flicker]

gooning simulator

[harsh matrix]

https://tenor.com/view/popcorn-minions-popcorn-day-laugh-gif-5026739

I have just caught up on the context

https://cdn.discordapp.com/attachments/779196945448304640/1364708570355990538/togif.gif

[sinful sapphire]

https://tenor.com/view/ishowspeed-yuorki-egyptian-speed-funny-gif-6210991462615795229

[tight lodge]

What's more surprising is whith who is arguing with.

[slate falcon]

[slate falcon]

pickles did you hear the news that im constrcucting a greggy

[frosty flicker]

grogk

[tight lodge]

I've seen some comments. Remember yesterday when I asked you how are you gonna test the optics?

[slate falcon]

oh yeah!

[stiff mason]

Can you guys real quick explain to me how the corrector plate infront of a SCT works

[tight lodge]

Hair comb it is

[slate falcon]

frrrr

£50 haur comb

[stiff mason]

Genuinely curious

[slate falcon]

it works by making a dish with a weak sorta sine wave look

the centre has to be covered tho

it cant correct the centre of your miror

[tight lodge]

From my brain dead understanding, it distorts the light so the aberration induced by the spherical mirrors nulls out

[slate falcon]

ur not far off

[sinful sapphire]

The Schmidt-Plate refracts light through it’s complicated pattern to spread the light Rays out in a way that the spherical aberration of the system is nulled out.

It however fails to correct coma or Field curvature effectively which is why you need a corrector

[stiff mason]

And how does a coma corrector work

[sinful sapphire]

Uses a set of multiple lenses of almost every type to correct coma and very Minor field curvature by pushing it in the opposite direction dependant on the optimised F/Ratio

[slate falcon]

fuc the loght

[slate falcon]

professional ones for super fast use a long 3 miniscus lens

[stiff mason]

And how does astigmatism get corrected

[slate falcon]

not makinf a bad system

[stiff mason]

Doesnt answer my question

[tight lodge]

With a 3rd mirror

[stiff mason]

Nuh uh

[slate falcon]

it does

bad shaped mirrors is the cause

[stiff mason]

Not the answer i wanted

[sinful sapphire]

…also through a corrector designed with lenses or inherently through geometric synergy of the design

Or by reshaping the mirror

Depending on the source of the astigmatism

[slate falcon]

offsetting those lenses in rotation ruins it

[stiff mason]

astigmatism caused by the intrinsic design of the system

[slate falcon]

you have to have them at a specific orientation

bue to hoe astigmaticsm eorks

[stiff mason]

How do you fix it how does the corrector of it work

[sinful sapphire]

What kind of answer are you expecting

[stiff mason]

No idea that's why I'm asking

[harsh matrix]

https://tenor.com/view/mike-wazowski-mike-wazowski-meme-uncanny-skull-emoji-bruh-gif-17460707452075767073

[stiff mason]

Yall are suspiciously avoiding the topic for some reason

[slate falcon]

you make a lens with the inverse variamt of astogmatism the sustem has

[stiff mason]

Uhh that's not true

[slate falcon]

yes?

[stiff mason]

Okay just making sure thank you for the information

[tight lodge]

Astigmatism is corrected by introducing an optical element that has the opposite directional focusing error.

The core issue is:

• one direction focuses closer,
• the perpendicular direction focuses farther away.

So the correction adds optical power in one axis but not the other.

---

In human vision

The usual correction is a cylindrical lens (or toric lens).

Unlike a normal spherical lens, a cylindrical lens bends light in only one direction.

If the eye focuses:

• horizontal rays too strongly,
• vertical rays too weakly,

the corrective lens compensates by adding/subtracting power along a specific axis.

Eyeglass prescriptions therefore include:

• sphere,
• cylinder,
• axis.

Example:
-2.00 sphere, -1.00 cylinder @ 90°

means:

• overall nearsighted correction,
• plus extra correction along one orientation.

---

In telescopes and optical systems

Correction depends on the source of the astigmatism.

1. Alignment correction

If caused by:

• mirror tilt,
• decentering,
• pinched optics,

then fixing the mechanics removes the astigmatism.

Common fixes:

• loosen mirror clips,
• improve support cell,
• recollimate optics,
• reduce thermal gradients.

This is the most common situation in amateur telescopes.

---

2. Optical compensation

If the design itself produces off-axis astigmatism, additional optics are added.

Examples:

• toroidal mirrors,
• cylindrical lenses,
• field correctors,
• Schmidt or Maksutov corrector plates,
• coma/astigmatism correctors.

Many wide-field astrographs use dedicated correctors.

---

3. Adaptive optics

High-end systems can dynamically reshape mirrors.

Used in:

• large observatories,
• laser systems,
• lithography.

Actuators deform the mirror to cancel measured aberrations.

---

Geometric picture

Astigmatism creates two focal lines instead of one point:

• tangential focus,
• sagittal focus.

Correction works by forcing these two to coincide.

A simple representation:

f_t = f_s

When those become equal again, the image returns to a point focus.

---

In fast Newtonian telescopes

Important distinction:

• Coma dominates off-axis aberrations from the primary mirror.
• Astigmatism is often dominated by the eyepiece.

Cheap wide-field eyepieces in fast scopes (f/4–f/5) commonly show astigmatism near the field edge.

That’s why premium eyepieces are highly corrected for astigmatism.

---

Diagnosing telescope astigmatism

True optical astigmatism usually shows:

• elongated stars,
• elongation rotates 90° through focus.

That rotation is the hallmark signature.

[slate falcon]

😭

[tight lodge]

I'm surprised he didn't asked me a question at the end

[slate falcon]

is ot true?

[slate falcon]

asked u a question

[sinful sapphire]

You just said before that one answer that was given to you isn’t the one you wanted

[tight lodge]

Shiiii... idk, I asked ChatGPT😂

[harsh matrix]

thinking about getting one of them correctors

[slate falcon]

[sinful sapphire]

https://cdn.discordapp.com/attachments/1248873743116140586/1273203966024487003/ezgif-2-db49a54415.gif

[harsh matrix]

https://cdn.discordapp.com/attachments/779196945448304640/1364708570355990538/togif.gif

[stiff mason]

Ignored it cause it was chatgpt

[sinful sapphire]

Rich coming from ya 🗿

[stiff mason]

I wanted answers from you and you specifically

Not ai

If i wanted it from ai i would've asked myself

[slate falcon]

and not me? awh :(

[sinful sapphire]

im certain you did already

[stiff mason]

You as in everyone here

[sinful sapphire]

It’s no secret what you’re trying to do with your questions and it’s obviously not asking out of interest

[stiff mason]

Hey yall told me i was wrong

I'm asking to correct my incorrect information

[sinful sapphire]

You are obviously expecting specific answers to eventually prove a point

[tight lodge]

@sinful sapphire is this how the conversation between me and Browi looked like?

[slate falcon]

i can only really explain with imagery assisted with words icl

[slate falcon]

YES

[stiff mason]

What point

[sinful sapphire]

na it was smarter than that

[slate falcon]

[tight lodge]

Kinda nice to see it from a 3rd person view

[tight lodge]

[slate falcon]

remember the star t

[sinful sapphire]

It’s kinda like it but at least the two sides knew what they were talking about

[slate falcon]

where it was back and forth

[stiff mason]

I dont get it

Am i wrong

Am i right

Or am i somewhere in-between

[slate falcon]

right about what

[stiff mason]

Nvrm

[sinful sapphire]

https://cdn.discordapp.com/attachments/920016996752564286/1251695052980359209/convert.gif

[stiff mason]

Just answer me this is the information you gave me factual or just what you think i want to hear

[slate falcon]

what i said is the truth

[slate falcon]

this is how it works

I'm no ai

i don't want to tell you what you want to hear

[stiff mason]

Alright

[harsh matrix]

yeah sure

we're gonna need to see proof

[slate falcon]

but my hair looks awful today!!!

[harsh matrix]

https://tenor.com/view/monster-versus-vs-alien-monster-vs-alien-gif-16037253809360562033

okay

carry on

[slate falcon]

i have to remember like 15 quotes from.a.christmas carol

i only rememeber one

😭

[harsh matrix]

hang on, I think we've achieved peak GHS stretch

[slate falcon]

only one i remember is "if they would rather die they had better do it and decrease the surplus population"

[harsh matrix]

now not to botch the rest of it

[slate falcon]

[slate falcon]

gunna talk about the malthusian theory for 45 mins

🔥🔥🔥

on an inspector calls i think ill cook tho

almost renember the whole final speech

But just remember this. One Eva Smith is gone - but there are
millions and millions and millions of Eva Smiths and John Smiths
still left with us, with their lives and fears, their suffering and chance
of happiness, all intertwined with our lives and what we think and
say and do. We don't live alone. We are members of one body. We
are responsible for one another. And I tell you the time will soon
come when, if men will not learn that lesson, then they will be
taught it in fire and blood and anguish. Good night.

best soeech ever

[frosty flicker]

https://tenor.com/view/plastic-man-real-real-powder-powder-that-makes-you-say-real-animated-comic-plastic-man-gif-7493651428267836743

[slate falcon]

https://tenor.com/view/cat-cat-shaking-head-fisheye-lens-gif-25374523

[harsh matrix]

guys I think we may have peak WIP

[harsh matrix]

chat

room

this feels like it wasnt pushed too hard

and the colors are a lot better

still not perfect, it still wants to be wild, but much closer to what i wanted

[stiff mason]

Ngl your rgb could use more data

Well actually more luminance too

But certainly more rgb than luminance because the colors from the galaxy are a bit muted which is usually what happens when don't have enough snr in your rgb

While your stars look very colorful which again makes sense because they have higher snr because they aren't extended objects could also be because of your processing but eh you can never have too much snr

[frosty flicker]

bros calling it a skill issue

[stiff mason]

Ik exactly what you're tryna do stop it

[frosty flicker]

?

[stiff mason]

Don't no bad sword of the six sages bad

[stiff mason]

Your tryna make another argument

[frosty flicker]

i wasnt even-

bruh

[sinful sapphire]

Don’t give reasons to start one

[stiff mason]

https://tenor.com/view/joke-jk-penguin-laugh-its-was-a-joke-gif-14574338

[tight lodge]

Is this a good level of meh?

[oblique sun]

the what scheme of things?

[tight lodge]

BigPharma won't stop manufacturing copium pills. Pills that 99% of the frac glazers take in order to believe that they have a good telescope. Only if they knew that any reflector is superior to a frac

[grizzled igloo]

overstretched

[quartz meadow]

a little little too much but colors are good

[frosty shard]

The you scheme of things. You schemer.

[tight lodge]

Everyone else is answering 😭

Damn... well anyways
This is the less stretced one. Looks kinda lame ngl😭

[quartz meadow]

I'd do the stars and bg of #1 combined with the M51 of #2

[tight lodge]

See, that's my thing. In the first image I was more interested in the background rather than the main target. I should try a random relatively empty patch of sky😂

[quartz meadow]

be your own survey and find new targets

[quartz meadow]

hey if you like background galaxies so much, go for NGC 4535. It has a really interesting and very filled field

[tight lodge]

I already figured out how to put my own images in stellarium

[quartz meadow]

neat huh

[tight lodge]

Oh yeah! Next is figuring out how to make a Hips survey and then I'm set

[slate falcon]

@frosty shard i just tried a fake star on my primary right

and i could see the parabolic shape like on faucault test

but without a faucualt test

like with my eyes alone

but the whole mirror surface was bright

[grizzled igloo]

understretched

[worldly bolt]

Worse

And I haven't even read all of it

[sinful sapphire]

im not sure if my brain will recover from this

[tight lodge]

Lobotomy to forget

[plush raptor]

literal propaganda

[gloomy hawk]

https://tenor.com/view/youknow-you-gif-19056787

[frosty flicker]

i love that meme i made

[plush raptor]

replace the rc with the nexus or smt

[oblique sun]

nobody thinks the nexus sucks its just not necessary

[plush raptor]

its the coolest thing ever

[tight lodge]

I don't disagree that is cool. It is cool... when it works properly 😂

[oblique sun]

im happy i chose the f4 newt over an rc6 based on all the troubles i see here

i already have enough mount issues, dont need scope issues ontop of that

[plush raptor]

factual

[tight lodge]

Ngl, that's what keeps me away from RCTs. They are just a pain

[crisp flower]

They certainly can be very much
Tbh im really hlad to have switched to one as it really elevated my knowledge of how to Go about ap and (even more so) collimation compared to my sct

Looking Back installing the dew heater Ring on it mightve been the most stupid think i did to it, but then i didnt knew that at the time

[sinful sapphire]

Truss Tube RCs are the way to go

Though I’m waiting for someone to make an affordable small CDK

Less of a pain

[tight lodge]

That's as plausible as Starvis2 APS-C

[sinful sapphire]

mmmm

maybe a starvis3 apsc will appear

[tight lodge]

I think we will land on mars before we get a Starvis3 APS-C

[quartz meadow]

you never know

[slate falcon]

the nexus is shit

the paracorr is better

[stiff mason]

We still haven't even gotten starvis 2 aps-c

[frosty shard]

Wait I did not know Starvis 3 dropped

[sinful sapphire]

In March

Imx908

[bleak solar]

@frosty shard I simply have to ask because procesing is always a pain for me. Do you save your time lapse frames as jpg or as a raw file?

[gloomy hawk]

do you rc people even post images or just yap about nerd stuff

[frosty flicker]

90% yap 10% images

[frosty shard]

I capture everything in RAW and use RawTherapee to batch process everything consistently

So like I only process one frame and apply that processing profile to the rest of the frames

[frosty flicker]

do you use davinci resolve for video processing

[frosty shard]

I'd post images if I had clear skies and didn't have the looming deadline of a PhD thesis

[gloomy hawk]

😂

[frosty shard]

Kdenlive

[frosty shard]

Though if you're talking about putting together the processed JPEGs, I just use ffmpeg on the command line to do that

[frosty flicker]

interesting

[frosty shard]

(like for a time lapse)

[frosty flicker]

bc the way ive been doing is raw and then converting to .DNGs bc davinci doesnt like raw dslr images only dng it like working with and work with that

[frosty shard]

You should use something like Rawtherapee or darktable to batch process the frames

that'll turn them into JPEGs

[frosty flicker]

interestingggg

i convertted to jpgs using sequator

[bleak solar]

ah neat. I have been using pixinsight for that... which isnt really a great tool for video editing xD

[frosty flicker]

but would do little to no processing

[frosty shard]

oh man prepare to get upgraded

The one problem I have with RawTherapee though is that I can't do a proper flat frame correction

[frosty flicker]

video processing in photoshop is better

that i knew already

[frosty shard]

apparently RawTherapee assumes that your flat frame is a single exposure that will be blurred

[tight lodge]

@harsh matrix Look what your boy got

[quartz meadow]

are you texting and driving again?

[tight lodge]

I am parked

[quartz meadow]

okay okay, it also looks like passenger seat

[tight lodge]

Absolutely. See? Passenger seat

[quartz meadow]

fancy passenger seat with fake steering wheel

[tight lodge]

Fiat and their weird damn designs

[quartz meadow]

terrible huh

[slate falcon]

https://youtu.be/DGMsSNMJ-xE @tight lodge you may be interested

[tight lodge]

I know about polarization. That's how I cleaned my igrams

[slate falcon]

aahh

[harsh matrix]

hell yeah

[harsh matrix]

ewwwwwwwww

fiat?

burn it down

[plush raptor]

whats that

[gloomy hawk]

is ANYONE gonna post an image or sum

holy YAP

''astroPHOTOgraphy-forum''

PHOTO

[slate falcon]

@frosty shard my slightly offset greg design vs parabolic newt at same fl + aperatur

[slate falcon]

just posted one

[gloomy hawk]

whrere

[slate falcon]

@gloomy hawk

[gloomy hawk]

https://tenor.com/view/falafel1-icanhasfalafel-face-palm-gif-13410750

[stiff mason]

Gang if you want to see photos search through the library there are plenty of photos

[plush raptor]

@slate falcon intresting comparison, also why im not getting the carbonstarr

[frosty shard]

not anymore

[stiff mason]

At least the good news is both of those sources of blur can be completely deconvoluted ie the high frequency data is not lost

[versed roost]

astrophotography-FORUM

[tight lodge]

Laser interferometry.
It helps you measure the wavefront error of a mirror

[plush raptor]

i know that, but how doesit affect the image

[tight lodge]

Ok, so the beam splitter is polarizing the light. But because of the chaotic nature of light you still see all random polarization. Now, if you add a polarizing filter past the beam splitter at the return path, you can filter out either the test beam or reference beam. You usually want the reference beam to be filtered out and have only the test beam. That way it gives you much cleaner interferogram

[plush raptor]

ahh

[tight lodge]

It's kinda the poor man's way of achieving a coherent laser beam

[versed roost]

sick setup, is it all 3d printed?

[tight lodge]

Yup

[slate falcon]

i think your mirror has a bit of a turned down edge

[tight lodge]

Wdym?

[tight lodge]

This?

That's just the bullseye of the interferogram. Normally when the igram forms, that is centered on the mirror and you have to offset it. In my case I ran out of range on the XYZ platform😂

It has micron precision but not a lot of range 😂

[bleak solar]

Jesus! Seeing this i had a flashback to my university lab courses... whe used those things for one horrible experiment

[tight lodge]

What was the experiment?😂

[bleak solar]

we had to create a laser from a lamp and the screws were not sensitive enough so we spent roughly 6 hours getting the distance right and went home. The supervisor told us that no one has ever gotten the laser to work

[tight lodge]

Why would he ask you guys to run an experiment that everyone failed because of inadequate hardware?😭

[bleak solar]

I have no idea...

[tight lodge]

When I got my platform I put it under a dial indicator to test its precision. I achieved 0.5μm precision with 0 backlash

[bleak solar]

oh how I wish we had that... but it was a beginner lab course so it wasnt so important

[tight lodge]

This was the hardest part about my project

[slate falcon]

no, ill point it out in a bit

curredntly busy

[tight lodge]

@frosty shard you said that the RCTs are purely reflective systems... right?
I have an argument that will blow your mind

[sinful sapphire]

Go ahead

[tight lodge]

What happens when light passes trough air?

[sinful sapphire]

by that Logic what happens when light hits glass (besides refraction)

[tight lodge]

It reflects. But, the fact that the OTA is filled with air that means there's a refractive component.

[sinful sapphire]

The fact that refractors have lenses means there’s a reflective component

The air is not a required part of the optical design, or an intended one anyway

Like Hubble doesn’t have air in it now does it

[tight lodge]

No, but it does affect the optics. Doesn't air have different refractive index based on temperature?

[sinful sapphire]

It does not, it affects the final image however

[sinful sapphire]

And yes, because it’s a gas it’s refractive Index is different based on temperature

[tight lodge]

That's where I wanted to get... what if vel's tilt is not tilt, but temperature gradient in the tube?

[sinful sapphire]

Would never be that consistent

[tight lodge]

I mentioned it because I experienced it with my 130PDS. So I assume a larger aperture will have a more severe effect

[slate falcon]

less usually

more area for stuff to go right

[tight lodge]

Larger volume of air as well😅

[slate falcon]

larger area of volume for air to be replaced

wider tube better airfloe

[tight lodge]

Yeah, a lot more hot air at the top and cool air at the bottom 😂

[slate falcon]

unless theres like hellishly big baffles in the system

shouldnt be an ossue

like really long focuser baffle

or realy lomg edge baffles

[tight lodge]

Or no tube to trap air

[slate falcon]

no toob is best

im a fan of no toob

[stiff mason]

Everything's refractive index is based on temperature depends on how much temperature some stuff needs little temperature to change and others need large temperatures to change

[slate falcon]

stop chat gpting knowledge

[stiff mason]

What bro it's just logic

[slate falcon]

stop using ai to learn stuff

read a book!!!!

[stiff mason]

Was the statement i made wrong tho

No

[sinful sapphire]

i mean yes everything has a thermo-optic coefficient influenced RI but the shift is so dramatically small that its nothing useful to contribute to this conversation.

[slate falcon]

but you still used ai to get the knowledge to argue

[slate falcon]

why does my lens have a different refractive index when i make it glowing hot, grr i thought you said its nothing useful!!!!

[stiff mason]

Yes but Larger temperature changes result in stronger change in the refractive index which i did mention

[slate falcon]

ai mentioned it

[slate falcon]

-# sory im being a guber

[sinful sapphire]

These temperature-induced changes are optically irrelevant if these changes are within reasonable limits of the optics' application,

It changes by around 0.0000001 per °C iirc

[stiff mason]

I mean the formula is dn/dT

[slate falcon]

maybe it will become relevant when we send things to the "surface" of the sun

[slate falcon]

surface in quotes bc its a boll of plasma

[sinful sapphire]

sure the refractive index of glass is noticeably different at 1200°C but you wont have anything to look through anymore.

[slate falcon]

the surface we think off

[slate falcon]

mfw puddle

[sinful sapphire]

Without leaving discord, can you tell me what these variables in the coefficient refer to?

[slate falcon]

do not disturb over do not time

[sinful sapphire]

taking an interesting amount of time with breaks there

[slate falcon]

i am so useless arent i

[slate falcon]

fiiiireeeeeeeeee i thibk my english exam whent okau

[sinful sapphire]

one secomb

[stiff mason]

Yup depends on the material but thats roughly around the ball park but if one end of your tube is like 40°C for some reason and the other is 10°C that will be pretty noticeable

[slate falcon]

unid taking two secomb

[sinful sapphire]

It wont.

well

based on the RI

thermal instability yes

but the RI change is so microscopically small you wont notice shit

0.00000030 change

[stiff mason]

I'm getting ready for school

[sinful sapphire]

if you dont know the variables in the coefficient thats fine

[slate falcon]

wjy doesnt the gradient of abput like 3c from the upper atmos to 10c not effect my refractive index then hmmmmmmmm

[slate falcon]

what are the barbibables fire

[sinful sapphire]

tha wha

[slate falcon]

vabiblblbles

varibls

vabirables

i give ip

up

[sinful sapphire]

n = refractive index

T = temperture

[slate falcon]

woaaa, i am now realising i have that written down in my book

i have the thigy for angle change written in my book

bc useful

[slate falcon]

in my book i also have a bunch of quotes from macbeth and the ratings i give them

[slate falcon]

have you read or seen macbeth

i like macbeth

[sinful sapphire]

nop

not much of a book guy

[slate falcon]

awh

its really a play but the way shakesphere writes his plays ot makes ot really easy to read like a book

same with J.B. Priestly with an inspector calls

its meant to be a play but it works so well as a book

[slate falcon]

look how beyond that ring it starts to go down agsin

it is nicely parabolised in the centre but it looks like it has a little bit of a turned down edge

not much tho

[quartz meadow]

hey isnt this a way of determining the shape and quality of the mirror and those lines represent internal stress or was that something else?

[tight lodge]

Not the best foucault test, but maybe you understand it😅

[slate falcon]

focault tests look pretty, dont know how to read them, but they defo are pretty

all i know is that the dimple in the middle means its parabolic

[tight lodge]

Yep... that's about as far as my knowledge goes

The bath test atleast uses some fancy DFT softwares to figure it out for me😂

[slate falcon]

bath test is so much more readable luckily

[slate falcon]

do you have the dft

[slate falcon]

of this

i wanna know close i was

[stiff mason]

Oh d is for delta T is temperature n is refractive index

[stiff mason]

It does gang what do you think seeing is caused by or dispersion

Well more seeing than dispersion because dispersion is caused by just high refractive index that's why it's stronger in winter (colder air higher RI) and less in summer (hot air lower RI) and seeing is temperature difference (different RI) coupled with turbulence turbulence alone cannot cause wave front error unless it has a velocity greater than mach 0.3 and temperature difference alone cannot cause wave front error because the temperature difference will alone shift the light statically it wont move it

[slate falcon]

currently grinding a shmidt plate

give me a bit

[stiff mason]

And the fastest air speed ever recorded on earth barely exceeds mach 0.3

So that's also an unlikely source of wave front error

[scenic mango]

woaw

[sinful sapphire]

you think the thermo-optic coefficient is what causes seeing? 🗿🗿

[stiff mason]

What no

Well

Technically it does

[sinful sapphire]

it doesnt

like

at all

[stiff mason]

I mean like if your lens or mirror is hotter than ambient then youll have tube currents so

[sinful sapphire]

also no

[stiff mason]

What

Explain

[sinful sapphire]

its not the thermo-optic coefficient thats causing that

its thermal instability

so if you insulate say, a maksutov completely from ambient

thereby stabilising the temperture

and the air currents as a result

you get rid of tube seeing

[stiff mason]

Well they are both releated on a technicality

[sinful sapphire]

correlation isnt causation

[stiff mason]

They both feature temperature

[stiff mason]

I didnt say it causes it

I said no

[sinful sapphire]

https://cdn.discordapp.com/attachments/920016996752564286/1251695052980359209/convert.gif

[sinful sapphire]

by that logic i can say cooking a steak is related to mirror thermals since its both temperture related

[stiff mason]

Amy was talking about atmosphere gang 😭

[stiff mason]

Well if your mirror is 600°C technically you can cook a steak on it

[sinful sapphire]

She was talking about temperture differences in the atmosphere relating to the thermo-optic coefficient

did you just read "atmosphere" and say that

😭

[stiff mason]

Yeah pretty much

[sinful sapphire]

https://cdn.discordapp.com/attachments/1454583948943298692/1490457666651422720/togif.gif

[stiff mason]

Hey she didn't exactly make it clear okay

[sinful sapphire]

it was clear as optical glass

[stiff mason]

She said 3C upper atmosphere releative to 10C and didn't follow anything after it

One would assume the 10C is talking about lower atmosphere

Not the optics themselves

[stiff mason]

Also let me clarify what you'll notice is CA

[wicked lantern]

@stiff mason are you getting your information from chat gpt?

[slate falcon]

HE DOPES

HE JUS ASK CHAT GPT

[wicked lantern]

It really sounds like your word vomiting chat gpt and trying to convince people your correct when you clearly don't know what your talking abojt

Like uhhh

Idk maybe you should rethink it

[frosty shard]

Remember, if you do not think, you do not am

[wicked lantern]

Lol

[slate falcon]

why do i dissapear for 3 seconds and he is spouting more bs

@sinful sapphire lens is properly shaped now btw

f30 1.25" singlet

[stiff mason]

Huh it makes sense think about it a lens relies on specific RI per element to correct for CA and if those RI are no longer what the lens was built for then ot cannot correct the CA and well

[slate falcon]

it no longer looks like a shmidt plate

[wicked lantern]

Lmao ok

[stiff mason]

This is just my pure logic I'm not even sure it's correct 😭 i haven't double checked

[wicked lantern]

Not how that works whatever

[wicked lantern]

Then why try to convince people

If you know it may not be correct

[stiff mason]

Well I'm like 80% sure it is

[wicked lantern]

[stiff mason]

Oh and also pinched optics but that's not because of the temperature difference

[stiff mason]

Okay so I'll admit this is wrong

But it does result in spherical aberration

[slate falcon]

onions result in triangle

[stiff mason]

Man the one time i dont double check

[slate falcon]

thats bc ur wrong always :(

[stiff mason]

Well it causes something i dont think 40c front and 10c back will have zero affect

[stiff mason]

Did you even read what we are discussing

[wicked lantern]

Yes and it hurts my eyes

[stiff mason]

What is it

[stiff mason]

Yeah so you didn't

[slate falcon]

i love onions

[wicked lantern]

FUNIONS

[slate falcon]

NO

I hate that meme

its stupid

its dumb

[prisma summit]

so what is going on here ?

[slate falcon]

get it outtttt

[slate falcon]

haii, unid is chat gomputer pomputer tomputer all his argiments

then getting it wrong

then defends himself

[prisma summit]

what does that have to do with RCs ?

[slate falcon]

rc thread is mostly for nerd stuff and arguing

rct is only on mondays and saturdays

[frosty shard]

idk here is a glorious Ritchey–Chrétien to bring us back on topic

[worldly bolt]

Where's noot glaze thread?

[slate falcon]

smash, next question

[frosty shard]

Start one :)

[prisma summit]

I need someone to explain to me why they bought an RC instead of a Newtonian ?
Unless they live with 1" seeing skies (which you probably don't if you are here)

[slate falcon]

theres the greg thread but its mainly people telling me the greg is bad

[worldly bolt]

I wonder why

[slate falcon]

i have 1" seeing often

[frosty shard]

Because a Newtonian is insufficiently glorious.

[worldly bolt]

[slate falcon]

ITS PERFECT

[slate falcon]

YOU HATER

[slate falcon]

also genuinely love it, ive always been obsesssed with the gregorian, being able to own a gregorian has always been my dream so getting the chance to buiild one is such an opportunity if u get me

im am the no.1 gregorian fangirl in the modern day i think

[prisma summit]

show me ?

[frosty shard]

if a Newtonian were sufficiently glorious it would not require a coma corrector (here we do not tolerate the heresy of refr*ction)

[prisma summit]

I doubt you have 1" seeing

[frosty shard]

also dude genuinely thanks for posting your light painting, I wouldn't have thought to do it if I hadn't seen yours and it's a lot of fun

[slate falcon]

this was 1.5" seeing a few weeks ago but my shitty barlow and my 6" low resolving power frigged me over

f15 and only 5 mins of data

[prisma summit]

not really 1.5" imo

[frosty shard]

was this lucky imaging?

[slate falcon]

yes

[prisma summit]

and 1.5" is a lot worse than 1"
which you said you have

50% worse....

[wicked lantern]

Still better than mine 💀

[slate falcon]

not every day is 1" seeing

;-;

[prisma summit]

so how many nights is it ?
10%

even at that rate a newtonian is better choice

or a refractor if you really want sharpness

[slate falcon]

ew

dont insult me

[wicked lantern]

Lol

[frosty shard]

REEEEEEEEE (how dare one speak of refr*ction)

[wicked lantern]

An sct is a reflactor

[slate falcon]

scts are bad

:(

[prisma summit]

sure...
but a 6" triplet will outperform a 10" RC 🙂

[slate falcon]

also refractors are anything but sharp

[slate falcon]

[wicked lantern]

My 1430 is pretty sharp

[worldly bolt]

Maybe a GSO rc

[frosty shard]

one thing to keep in mind about this, btw, is that seeing FWHM does not put a hard cap on what kind of details you can resolve in an extended object. You can observe details well below the resolution limit, like the Encke gap in Saturn's rings

[wicked lantern]

Crap

[slate falcon]

-# also btw im not going to use an rc, im making a 10" gregorian, hand ground mirrors and all

[worldly bolt]

Still hard to believe

[wicked lantern]

Ok bald asleep

I'm half

Reeeee

[frosty shard]

Outperform in what sense actually

[worldly bolt]

English?

[wicked lantern]

Asleep

Gahhhh

[prisma summit]

perceived sharpness and contrast

[slate falcon]

he is going to bed

[slate falcon]

[wicked lantern]

No I'm in the car with an hour left

[slate falcon]

oh

[wicked lantern]

I'm not driving tho

[slate falcon]

i mis interpreted

darn :(

[wicked lantern]

I'm not driving my friend is lol

[worldly bolt]

Nah he's def driving while typing on discord

[wicked lantern]

I'm too glurp

[slate falcon]

[wicked lantern]

I don't own a teala

My friend definitely is driving

[prisma summit]

69 is the correct temperature

[slate falcon]

the unid argiing has moved channels for once!!!

[wicked lantern]

You mean 64

[slate falcon]

horay horay

[slate falcon]

it was mostly optically limited

[wicked lantern]

Oh no wait

[slate falcon]

:(

[worldly bolt]

Look at this beautiful glass

[slate falcon]

i want to throw up

[slate falcon]

not william optics too

[wicked lantern]

Not a tak or ap

[slate falcon]

pinnacle of depression

[worldly bolt]

Those are overpriced

(I paid too much for this)

I should have gotten an Esprit 120

[slate falcon]

now a good cff rct on the other hand

thats amazing

[prisma summit]

a 100mm frac imaging this..

[slate falcon]

my newt is sharper than that

[prisma summit]

ur 100mm newt ?

[slate falcon]

no my 150mm

[slate falcon]

i will grind a 100mm mirror just for you, so we can compare sharpness

[wicked lantern]

Lol

[frosty shard]

I mean with sharpness/contrast, you'll still get better resolution in a strict sense with a larger aperture (regardless of CO), and deconvolution will recover the contrast with sufficient data acquisition

The refractor will probably have better etendue though, no getting around that

[wicked lantern]

There is also no central obstruction

With a frac

[slate falcon]

ohh wowww less low frequency info

[prisma summit]

RAW

garbage in = garbage out

decon will always improve images in post

[slate falcon]

it means nothing!!!

you loose a very minimal amount of low frequency info

[frosty shard]

Central obstruction matters a lot less that people claim

[wicked lantern]

I mean it depends lol

[prisma summit]

sure
sure..

[wicked lantern]

What if you have a slow scope and a chungus central obstruction

[slate falcon]

its not like you can just crank up the 5th scale on wavelets and regain all the lost sharpness in that area

[slate falcon]

(5th scale usually controls underlying contrast)

(the stuff you loose)

(the low freq info)

(which contains no fine details)

(fine details are high frequency)

[worldly bolt]

Aperture is king end of story

[frosty shard]

Whether deconvolution can be done successfully will also depend the data quality

[worldly bolt]

Pointless debate

[slate falcon]

omg ur so right!!

[slate falcon]

ong

[worldly bolt]

I like fracs but this is dumb

[slate falcon]

oh yeah, and optical quality

[prisma summit]

unless its GSO or GSO derived telescope
(GSO mirrors in custom tube behave a lot better tho)

[worldly bolt]

The big GSO truss RC's can get pretty sharp stuff

I've seen some insane stuff from the 16"

[slate falcon]

lets say you have a 10" and an 8" mirror but the 10" mirror is stupid high quality exept at the last 2" due to a turned down edge, masking off those last 2" will result in a net sharpness gain as you loose the scattering of the outer 2"

[prisma summit]

but F8 or F6.3 = slow

[slate falcon]

so bigger is better unless the lens/mirror is shit

[worldly bolt]

Closed tube GSO stuff ehhh

I wouldn't bother

[slate falcon]

do you think my mirrors will be better than gso

🥺

[frosty shard]

I hope this doesn't sound harsh but...learn to read MTF graphs everyone.
(It's a super useful tool for understanding how features are actually resolved in an image)

[prisma summit]

f the MTF
read the images
end performance is what matters

[worldly bolt]

Idk, but I do know mirror grinding is not easy.

[prisma summit]

same with spot size simulations

END RESULT IS KEY

[worldly bolt]

Ostahowski or zambuto mirrors are thousands

[slate falcon]

horay, someone that doesnt overestimate my ability

[frosty shard]

Well I've done visual planetary observing with my 8" RC (probably the single most sensitive task to CO size) and it's actually decent at it. Is it better than other 8" scopes? No, but it's not mush by any means

[frosty shard]

Fs in the chat for Zambuto.

[frosty shard]

What is the MTF if not a measure of performance

[slate falcon]

this is with a diy 31mm f4.5 lens

i still havent been able to test my diy frac on the stars

my sky hates me

[slate falcon]

its a sextuplet

[prisma summit]

congratulations
this means jack shi*

literally empirically worthless data

[slate falcon]

but i thought results mean everything

[prisma summit]

image a star

[slate falcon]

i only have fake ones

i have clouds stopping me from using the real ones

[frosty shard]

Great Britain moment

[prisma summit]

FWHM and star shape is measure of performance

[slate falcon]

fwhm isnt always

[prisma summit]

and u chose to buy an RC which is slow AF

[slate falcon]

i said i havent bought an rct...

[prisma summit]

indulge me to what is key

[prisma summit]

ah
so u can still be saved from a stupid decision

like drinking and driving

[slate falcon]

im making a gregorian which is almost 2 stops slower

[wicked lantern]

Lol

[slate falcon]

hand grinding the mirrors and everything

[prisma summit]

so u hate yourself

[frosty shard]

FWHM is a single scalar value which is not robust to common deviations in a star profile
MTF graphs are calculated directly from star shapes

[slate falcon]

obviously, when i get good ill start selling mirrors too

[prisma summit]

same with people who use analog cameras

worse image, but "for the soul", for the "culture"

[slate falcon]

what about people that use a lwir cam?

do you have something to say about that

[prisma summit]

long wavelenght infrared imaging ?

[slate falcon]

its also going to be gold coated btw

[slate falcon]

yes

[prisma summit]

move away from earth
anything IR on earth is funny

there is a reason JWST is at L2

[slate falcon]

thats for miri.....

mir is almost 100% blocked by the atmosphere

[prisma summit]

be cool and image NUV 😉

[slate falcon]

lwir however has 2 major and 1 minor window

[slate falcon]

i would but that would mean making a second greg with nuv optimized aluminium

[prisma summit]

but slow scope + LWIR = slow AF

[slate falcon]

slow is better in ir

[frosty shard]

honestly after researching this I feel like a shortpass blue filter is superior to an NUV filter

[prisma summit]

its like saying being fat is good because having fat is good in winter

[slate falcon]

what

[prisma summit]

slow = bad

[slate falcon]

false!

[prisma summit]

you only have so much time in ur life for stuff to be slow

[slate falcon]

it reduces star halos in ir

[slate falcon]

all of it

[prisma summit]

star halos = bad optics

[slate falcon]

false star halos = no anti reflective coatings in infrared for cheap

[frosty shard]

also étendue is what matters, not focal ratio. What pixel sizes would a longwave IR sensor you'd use have?

[slate falcon]

i think its 6um

i need to be majorly oversampled

like majorly majorly

[frosty shard]

yeah that would be massively oversampled

[slate falcon]

it is

[frosty shard]

I would have expected such a sensor to have significantly larger pixels than that tbh

but if it works it works

[slate falcon]

it should

i should do ap during the day

that would be silly

[slate falcon]

btw the sensor is 32x24

[frosty shard]

Got a link to it?

[slate falcon]

ik its a kaf sensor

i cant remmeber the numbers

[worldly bolt]

Nah that's just fun

[slate falcon]

this

[worldly bolt]

Making a Greg scope on the other hand

Is pain

[frosty shard]

is also fun :)

[slate falcon]

cant have shit in #1326833769495269376

[slate falcon]

lux, i have an image that would probably make you pass away

its IHO on m94

[gloomy hawk]

what the hell is I

[frosty shard]

Infrared

[gloomy hawk]

oh

[frosty shard]

a lot of us here image infrared

[slate falcon]

im tryna slowly phase into just infrared

will occasionally shoot visible

but its just not as silly

like who doesnt love galaxies getting blown out in 10 minute subs

at unity gain

this is why i need slower!!

[frosty shard]

I will say, you should seriously consider getting more H-alpha integration if you have the time

[slate falcon]

ir is just too sensitive in galaxies

[slate falcon]

oh yeah 100%

i need it

[frosty shard]

https://app.astrobin.com/i/b1w4ws

[slate falcon]

ooh

that could look pretty

i need to get some narrower bandpass ir filters

so i can fit 3 different ir's at once

instead of just 2

[worldly bolt]

[slate falcon]

hawt

[stiff mason]

Not arguing a nice and civil discussion unlike some people not to name any

[harsh matrix]

WHAT ARE WE DOING IN MY CULT CHAT?

ARE WE DISCUSSING NON RC TOPICS?

[slate falcon]

nothing you do is nice and civil

[harsh matrix]

https://tenor.com/view/cat-cat-shaking-head-fisheye-lens-gif-25374523

[slate falcon]

i love rc

all i rc is rc

my life is rc

[stiff mason]

What can a guy not defend his opinion and only accept whatever everyone else says blindly

[wicked lantern]

Tbh shoving false information into our faces from chat gpt then getting all defensive when people actually know it's false AND providing you with information to WHY it's false. Tbh it really sounds like you aren't being kind tbh

[slate falcon]

im not being nice?

okay

[wicked lantern]

@slate falcon not you

Lol

[slate falcon]

oh okay

[wicked lantern]

I meant to reply to you know ehi

Who*

Lol

[stiff mason]

That wasn't even chatgpt it was my own reasoning and the only reason why i was wrong is because i decided to be lazy and not double check the information i gave

[wicked lantern]

Bruh

I've heard otherwise from other people

Anywho I need to go to bed

[slate falcon]

gnnn

[harsh matrix]

How

It's 7 pm

[wicked lantern]

Lol

It's 8

[harsh matrix]

[slate falcon]

he needs his eepy sleepy okay

[wicked lantern]

I got.uo at 6 was fishing the entire day

[harsh matrix]

You're not in Texas rn?

[wicked lantern]

I got home 2 days ago

[harsh matrix]

Ah

Imagine not living here

[stiff mason]

Nuh uh look at this

[harsh matrix]

In perpetual bad weather land.

[stiff mason]

Like tell me thats not rage bait

[slate falcon]

AHAHAH

[wicked lantern]

Nah it's fine

[slate falcon]

I KNEW IT

I KNEW YOU WOULD TAKE IT OUT OF CONTEXT

[wicked lantern]

Well sometimes

[slate falcon]

I GOD DAMN KNEW IT

[stiff mason]

Look at my first message

What does it say

[slate falcon]

you were talking about tma's

[slate falcon]

ficking tma's

[stiff mason]

"A mirror with the opposite aberration"

You the told me it was false

[slate falcon]

that only corrects on axis

[harsh matrix]

Not this week lmaoooo

[slate falcon]

therefore it isnt a tma

[harsh matrix]

Rainy all week

[slate falcon]

it is false if you want your tma to work like a tma

[stiff mason]

Well how would it correct all axis

[wicked lantern]

💀

[harsh matrix]

This is why im not engaging

[slate falcon]

you need 3 mirrors with a hyper specific conic constant to correct off axia

[wicked lantern]

Smart move lol

[slate falcon]

you were sayig you could take 2 mirrors form and rct and add a third making it a tma

[harsh matrix]

Im just talking around the argument because you cannot win an argument with somebody like this.

[slate falcon]

yeah

[wicked lantern]

Lol yea

[slate falcon]

im just hella axious from exams and arguing is good for loosing it

[wicked lantern]

Lol

[slate falcon]

i wouldnt engage otherwise

[harsh matrix]

They will twist your words to fabricate an idea that you are attacking them and they are the victim and that somehow removes themselves from all of the criticism that comes with holding an opinion.

It's hopeless.

[stiff mason]

You can if you provide me with the data (or math) I'll gladly listen but as long as it's your word against mine then yk

[harsh matrix]

Arguing makes me more anxious.

I cant do it.

[slate falcon]

awh

[stiff mason]

Anyways back to this can't you make it that using the mirrors of an RC

[slate falcon]

rct's are made aplanatic so they have to be in a very very specific configuration that doesnt account for any extra mirrors

i do think you can add 2 more mirrors to make an rct well corrected across a large field tho

1 doesnt work

[stiff mason]

Wait but how come a lens gets to just have the opposite aberration while the mirror cant

[slate falcon]

lenses are not the same as reflective elements

[stiff mason]

Gn

[harsh matrix]

Listen. I was diagnosed with anxiety, and I medicated it for a while but it's generally mild enough to manage without medication. It's only when I feel the walls closing in on me that I feel panicked.

Even if I have no reason to be panicked.

[wicked lantern]

Did someone say walls closing in

Iykyk

[harsh matrix]

It's just that when you get forced down a path you didnt voluntarily go down, your mind gets left with a scar that never quite heals.

[slate falcon]

[stiff mason]

Really how so

[slate falcon]

theres no reflections

[wicked lantern]

There shouldn't be any lol

[stiff mason]

Yeah but like how does that affect how the light behaves

[slate falcon]

also irl i would not be anythjng like this

i am like borderline mute

[wicked lantern]

But I don't think I should go down the rabbit hole of coatings etc etc

[slate falcon]

[slate falcon]

agreed

[stiff mason]

Man i thought you were going to bed go already you keep coming back like one of those zombies that keep reanimating

[stiff mason]

Same

[slate falcon]

really??

woaw

[stiff mason]

Yeah the only person i can truly talk to is my close friends everyone else the conversations just feel forced for some reason especially when you dont have a topic of interest

[frosty shard]

based question

[slate falcon]

i love the rct

the rct is amazing