Ritchey–Chrétien enjoyers thread

[crisp flower]

Their eaf wasnt Out when i built it so i still have a zwo one

[harsh matrix]

Yeah so stuff like that can make the ring not calibrate

[bleak solar]

Dust?

[harsh matrix]

Even if it was slightly out from not all the way tight. 💀

[harsh matrix]

Galore

[crisp flower]

Luckily for me its Clearing Up now

[bleak solar]

Dang

[crisp flower]

So now i can test

[harsh matrix]

Ye

[crisp flower]

And probably recollimate lol

[harsh matrix]

Hopefully not but yeah maybe.

[crisp flower]

We' ll see

[bleak solar]

Any idea where the dust could be sitting? I already blew off the L filter

[crisp flower]

If its Not the Filter, its the sensor

[bleak solar]

No

It’s from the adapter 😬

My finger is black after wiping it off

Ah! Much better!

And sorry for just shooting my laptop screen I know it looks like shit 😅

The egg shaped stars are probably because I don’t have a tilt corrector, right?

[harsh matrix]

I cant find any information about what size thread the screws for the primary mirror use.

Everything Google says contradicts itself and the sources are for noots.

[crisp flower]

U mean the collimation and Locking screws?

[harsh matrix]

Yeah

I need to know

[crisp flower]

Theyre both m4x16

The collimation screw has a Box head and the Locking screws is a worm screw

@harsh matrix

[harsh matrix]

Did you measure them?

[crisp flower]

Not directly
I Had to replace one of Mine and then i tried with some different ones i ordered in the web of Simular size

[harsh matrix]

Fr?

Both are M 4?

Thats what Google said but for noots so if youre right then I will order some.

[crisp flower]

Yes theyre the Same
Its Just different heads

[harsh matrix]

Hell yeah

[crisp flower]

One is Box, the other is worm

[harsh matrix]

Yeah 2.5 mm and 3 mm heads

[crisp flower]

Correct

[harsh matrix]

3 for the adjustment screws, 2.5 for the locks

[crisp flower]

Yes

[harsh matrix]

Ill see if i can find similar heads with the right threads but much longer.

[slate falcon]

hai veloren

[crisp flower]

I thought of the Same but didnt because i was scared of ripping them Off by accident

[harsh matrix]

Nah you wont break them without an excessive amount of force.

I need some longer ones because collimating the primary on my scope with the decoupler is like digging around in a bag while looking for a keyhole to put a key in while youre blindfolded.

[crisp flower]

Oh thats relatable

[crisp flower]

I know my Luck and dont want to risk getting in this Sort of Situation tbh xD

Some Lil galaxies near polaris

I do have to adjust collimation

[harsh matrix]

@frosty shard they raised the price of the TS express decoupler by a lot.

[slate falcon]

breh

they noticed people are getting interested in rc's

its kinda crazy how its taken so long for rc's to gain popularity

bc go back 6 years and you only see 1 or 2 people talking about them

or discussions on them being bad

[harsh matrix]

Most of the difficulty of collimating them comes from the fact that they use hyperbolic mirrors

If you were to get one of those f/2 or f/3 noots with the hyperbolic mirrors, the Sharpstar things, just imagine how hard the RC is to get right and crank the sensitivity much higher 💀

[harsh matrix]

Do you know the thread pitch ?

Google says x 0.7 for the pitch

[frosty shard]

Well the baffling issues were pretty bad, and everyone wants fast scopes, so I get it

[crisp flower]

I do Not unfortunately

[harsh matrix]

I think all of the ones in this size are 0.7 mm so im going to go ahead and order some of those.

[frosty shard]

Here's a pair of G band flats I took at 100 gain (left) and 200 gain (right) - just wanted to see if that had any effect

Doesn't seem like it

I can see a trace of the artifact in there though, but I haven't been as meticulous about flocking the rest of the imaging train

[slate falcon]

yus

i want da focal lenthhhh

[candid flame]

Holy dust spots

[slate falcon]

how can you stand this

[harsh matrix]

Yeah fr

These guys bullied me about mine

Yet that's wayyyyyy worse than ive ever let things get

[tight lodge]

Damn... have ypu considered cleaning your optics every now and then?

On my phone those 2 areas literally have the same brightness.

[slate falcon]

same 😭

[slate falcon]

https://cdn.discordapp.com/attachments/807809192537882647/1387522145294356500/attachment-3-1.gif

[frosty shard]

I have been avoiding disassembling my imaging train too often so I don't screw things up but it appears it is time

[slate falcon]

it was time like 2 months ago

[crisp flower]

Well dis-and Reassembling Made my dust-situation pretty Bad as Well 😭

[harsh matrix]

Lots of dust yay

💀

[crisp flower]

Yeaaa
Gonna Take it all apart again after i Take Flats and Check If its fixed now

[slate falcon]

@harsh matrix i think my mount can hold a lot more weight than i thought

people have put 8" shmidt Cassegrains on it and still been able to do 5 min subs

[haughty steppe]

sct are fairly light

my 8" sct weighs 11lbs and my 10" rc weighs 45lbs.

[harsh matrix]

I dont know what mount you have.

[slate falcon]

oops, i thought u didd

i have the eq3

😭

[slate falcon]

okay wgar

what

how can a c8 weigh the same as my 6"

noot

😭

do they use minscus mirrors or something???

[haughty steppe]

idk about a c8. I have a LX200 8". They should be really similar

[silver ibex]

A C8 is like, 6kg

[slate falcon]

thats insane

[haughty steppe]

idk how well your mount tracks. But as long as it tracks good with the 6" the 8" should be fine

[slate falcon]

i can do 30 min subs so i would say alright

[silver ibex]

The tube is shorter, that's quite a big deal. And yeah the mirrors are kinda like a meniscus mirror but not really?

[haughty steppe]

whats your average rms tho?

[slate falcon]

usually about 0.9

[haughty steppe]

what camera?

[slate falcon]

wait whats rms again

the total guiding corrections right?

[haughty steppe]

your average guiding

[slate falcon]

585

[slate falcon]

yea 0.9 usually

sometimes spikes to 1.2 tho

[haughty steppe]

I would not pair an 8" sct with a 585 sensor

[slate falcon]

i want an 8" rct

[haughty steppe]

better, but your gonna want it reduced

[slate falcon]

sct still has glass in it which i dislike

[slate falcon]

no

i dont want it reduced

[haughty steppe]

your guiding cant really support it tho

[slate falcon]

i can just do shorter subs

[silver ibex]

Just bin

[slate falcon]

or stick with the original plan of getting a 6" rct

[slate falcon]

exactly!!!

[haughty steppe]

a 6" rc would give you a resolution at .87 with bin2

[slate falcon]

hear me out, bin then drizzle

[haughty steppe]

585 binning sucks. At least imo

[slate falcon]

it does

[silver ibex]

CMOS binning sucks in general, but it's better than being extremely oversampled

[slate falcon]

i had my first ever night where i didnt have to 2x drizzle to get out the details more yesterday btw

i had horrendous seeing

[haughty steppe]

you would be running bin3 for a res of 1.12 with an 8" rc

[slate falcon]

i will win tho

i would rather be oversampled

than bin down

the entire point of getting the rc is so i dont have to have glass in my system

[haughty steppe]

I mean, you do you. But I wouldn't recommend

[slate falcon]

@harsh matrix do you use a corrector with your rc?

bc ik you use a big sensor

[harsh matrix]

I used a flattener

But it isnt a corrector

[slate falcon]

ah

[slate falcon]

So like a generic flattener?

[slate falcon]

is the astigmatism bad at all?

[harsh matrix]

Yeah

[harsh matrix]

There's not supposed to be astigmatism when you are perfectly collimated and in focus.

If there is, that means your collimation is balls

[slate falcon]

ah okay

im pretty sure at the very edge theres astigmatism

[harsh matrix]

There's only coma and the only coma it has with the flattener is a slight elongation, barely noticable when collimation is good

[slate falcon]

like at full frame sensor size

[slate falcon]

okay thats good

[harsh matrix]

Without anything, there's bad 5th order coma in the extreme corners but it is well corrected for about 80% of the sensor.

[harsh matrix]

Probably there

Because at full frame you would be beyond the illumination circle I believe, so the very edges of the circle of illumination would be visible and you would see the absolute worst of what the scope has to offer.

[slate falcon]

truee

[harsh matrix]

However these RC's don't advertise full frame support or claim that it can handle it.

It would be expected.

[slate falcon]

ts advertises a corrector that lets you use a full frame if you have a big enough rc

[harsh matrix]

Yeah that's the catch

[slate falcon]

i think its the 10"

[harsh matrix]

The 8" RC definitely wont do that.

Forget the 6

[slate falcon]

i woulda thhought that

which sensor do you have i wanna check the specs

[harsh matrix]

Imx 571

[slate falcon]

thx

so if i go with a slightly bigger sensor i should be able to use it with an rc8

thats good to know

i pray a bigger sensor comes out with good ir qe

[harsh matrix]

Yes

[slate falcon]

[harsh matrix]

https://app.astrobin.com/i/oqmb7y

A mak cass with a very similar artifact.

[slate falcon]

hmmm

that means its not unique to rc's!!!

[harsh matrix]

I suspect it is a flaw with all cassegrains

A risk necessary for the design to work

[slate falcon]

yea

[crisp flower]

i saw a simular artifact on astrobin onn a newt i think

[harsh matrix]

Newts can produce a similar one if light passes through either of the mirrors.

[crisp flower]

ive not been able to gather a lot of data and the flats overcorrected a little but i dont see it here

[crisp flower]

got it

[harsh matrix]

I dont see it either

So

Cause is

Flex?

For you and me?

[crisp flower]

maybe its not there yet because its too little data

only 40 mins

but idk

[harsh matrix]

I could make it pop up with only 15 minutes

[crisp flower]

well, if so and it wonnt appear, then it was indeed flex

[harsh matrix]

You'd have to keep adding data to know 100%

[crisp flower]

i will

this merger is more interesting than i thought itd be

[harsh matrix]

It's good news regardless

[crisp flower]

it is!

[harsh matrix]

Is that one of the ARP's?

I need to do one

[crisp flower]

ngc 3226 and 3227

[harsh matrix]

I think ill recommit to NGC 4725 tbh

[harsh matrix]

Yes

It is in the Arp catalog

[crisp flower]

also looks pretty cool

[harsh matrix]

Although Stellarium doesnt specify which one

[harsh matrix]

Yes!

[crisp flower]

oh i didnt know xD

i just scrolled around looking for stuff thats probably not being imaged that often

okay holy damn shii

[harsh matrix]

I did because it looked familiar

[harsh matrix]

Gyatt

[crisp flower]

oh well

[crisp flower]

thats the bar for me now xD

[harsh matrix]

Get all that tidal stream goodness

[slate falcon]

i have a feeling these galaxies have collided

[crisp flower]

just barely

[vapid patio]

sswordholy crap

[slate falcon]

the rcs have quartz mirrors while the noots have bk7

[stiff mason]

Ngl thats like avg seeing

Around like 2 arcsecond ish

[ripe crystal]

that's very good seeing

[stiff mason]

No thats avg bad would be 3-4 good would be 1-2 avg would be 2-3 and excellent would be sub 1

Well bad would be 3 plus it's not really capped at 4

Heck it can even get as bad as 10 and even 2° if you are looking directly into a heat plume from a camp fire

[ripe crystal]

i should move to where 2 is average

especially with my sct

[ripe crystal]

that is a good idea

[desert locust]

idk what my average seeing is

its prob like 2, I think its decent

[versed roost]

where tf do you live

[stiff mason]

It's a global avg man

[versed roost]

source?

[stiff mason]

It's not my local seeing

[stiff mason]

Give me a sec

Look where the middle is

[versed roost]

middle of a scale does not mean average 💀

[versed roost]

"astronomical sites" is definitely not the global average

[stiff mason]

That's literally a government website no excuses

[stiff mason]

Also by astronomical site they dont mean chile or pristine areas literally anywhere with a low enough bortle is considered an astronomical site

Because that's all that matters at the end of the day

[versed roost]

ah yes, the ocean

ah yes, mount everest

[versed roost]

[crisp flower]

Based on These, seeing whilst taking the subs was more of a category iv
The distortions in the master are due to a really Bad tilt i introduced in the ota

[stiff mason]

Unlikely

Possible but unlikely

[crisp flower]

Well i was there and i was vreally surprised

Because i Had them Rings all the way even in the live View whilst i was trying to collimate

And on Out of Focus Stars as Well (which ive only Had once before that i know of)

[stiff mason]

Well there is one thing while you're seeing can be sub arcsecond if your tracking and focus are bad then thats going to be detrimental to your final resolution since seeing increase by the square root

[crisp flower]

Guiding was shitty because of the tilt, Autofocus failed beyong Luminance because a screw was loose

[harsh matrix]

the rings are central obstruction modulation

[crisp flower]

Unfortunately i dont have much Data to Provider in Terms of the seeing i was having but this is how starslooked Like Out of Focus whilst trying to collimate

[harsh matrix]

they are a product of light scattering due to the secondary obstruction

internal rings like that are something else

psf patterns

[crisp flower]

Idk ive only Had them once when i was running the sct

So i was surprised to See em

[stiff mason]

That doesn't really prove anything

Air disk rings are only visible when you are in focus and are the true determination of whether you have good or bad seeing

That and PSF and FWHM

Both of which also require good focus

[crisp flower]

Well i guess These would be affected by the tilt as Well, so there is No Proof except me saying that it was how ever i think it was.
Which makes my Statement pretty baseless and irrelevant i guess🤷‍♂️

[stiff mason]

It measures your image resolution not atmosphere

I should've specify

For atmospheric seeing there is like a special tool using a prism and a software

Mr pickles was working on it last time i talked to him

[crisp flower]

Got it

[harsh matrix]

@crisp flower There's another problem I forgot about which could be a source of error for me

[crisp flower]

Which is?

[harsh matrix]

You know how the focuser and the extension tubes for the back of the scope all have a beveled surface to aid in the seating of the focuser?

The decoupler I bought doesn't have such a surface.

[crisp flower]

Yes

[harsh matrix]

Putting the focuser on is exceedingly difficult

[crisp flower]

Oooooh

[harsh matrix]

Sometimes you can get it on, think it's on really well, but you can move it really easily.

[crisp flower]

Thats really annoying ngl

[harsh matrix]

Tightening the collar as much I am able is still sometimes not enough to stop it from moving.

[harsh matrix]

Yes

[crisp flower]

Do u have any Idea how to fix that?

[harsh matrix]

Im looking at upgrading to a baader steel track

It would get around that issue entirely.

[crisp flower]

That Sounds good

[harsh matrix]

It would be a light leak sealed focuser as well.

Yeah

[crisp flower]

Even better

[harsh matrix]

I'm picking up some extra hours and put in some paid time off so I can make it happen.

Plus with the focuser I got being a rack and pinion, I'm sure theres a few microns of movement in the drawtube, leading to an illusively stable system, to where I think it's fine but it moves just enough to be a nightmare.

The steeltrack doesnt have that issue

I can eliminate the focuser as being a source of error entirely if I get one so, I think that's the most logical course of action next.

[crisp flower]

Sounds Like that
Im gonna gather some more Lum tonight to See if i got rid of it now

[harsh matrix]

Plus it might be low enough profile to where I can thread the Apex directly onto the drawtube

[crisp flower]

Uuuuh

[harsh matrix]

If it's still got room I can install the rotator I got as well.

[crisp flower]

Thatd be super cool!

[harsh matrix]

In total it would eliminate 3 problems in one go.

[crisp flower]

First Thing i'll do after this Test is cleaning These Filters goddamn

I actually dont think its ever been this Bad xD

[harsh matrix]

I dont know if mine was ever that bad.

[waxen mountain]

My Sony DSLM 🙏

Fingerprint in 4K Even if I can't remember having touched the sensor with my finger

[digital nexus]

Why do you all have such dirty cameras, RCs, everything g

Like wtf

Clean your shit

[harsh matrix]

What the hell

Everybody was so passionate about telling me to clean my stuff

Yet every single one of you is magnitudes worse than what mine looked like.

[waxen mountain]

I've never cleaned any filters or sensors
I've never really gotten to learn it
But I want to learn how to do it right in the near future

And because I didn't do it, I didn't dare to clean it in the fear of making a mistake

[tall summit]

I adopted a donut-free sensor policy

every time I get a spec of dust ,I clean the sensor

which is not often at all, its a locked system with the reducer

this way my flats are always the same and they always work

[crisp flower]

i tried that. It worked quite well except on the lum (and now every filter lol)

[slate falcon]

real

but thats bc i get angy when theres dust

[crisp flower]

the flats definetely didnt correct properly but the artifact is gone

[tight lodge]

I'm an exception

[harsh matrix]

That is very interesting.

Now I wonder why the flats are correcting the crater but not the dust.

[slate falcon]

HEY, I HAVE NO DUST SPOTS!!!

[crisp flower]

Probably taken the Flats wrong

Also the big dust mote seems to have moved to thats why Theres a dark Edge i think

I cleaned the Filters now anyway
At least a little

This is soooooo much better

[harsh matrix]

That looks very good

[slate falcon]

shrap

[haughty steppe]

if you leave your camera in your rc your flats will look bad to

its an open telescope system, not a refractor

[tidal hearth]

We are

[tidal hearth]

Don’t you have a filter infront of it?

I mean just clean it regularly

[tight lodge]

Not to be Mr. Actually
But you can just put a 2" clear filter ahead of everything so you have a way to protect the filters from dust

[tidal hearth]

[tight lodge]

Show us

[haughty steppe]

Idk, before I last put my camera in the rc, I cleaned the camera and they were brand new filters. I have a reducer in front which should technically block the dust making it a closed system but my flats are still terrible. My guess is dust under the ar window but I don't remember

[tidal hearth]

I will later when I set it up again for the next nights

[crisp flower]

Ooooor you could send a flat from nights where u already Set up👉 👈

[tidal hearth]

Well u gotta wait till im back home

Still at work till 6pm

I got 4 apprentices that I have to teach stuff .-.

[crisp flower]

I Had 1 intern today and im so glad thats over xd

[tidal hearth]

And those apprentices are dumb as hell

I told them 6 times and it’s also on paper in their instruction and they still have the nerves to ask me on how to do it again

[crisp flower]

This telescope Looks weird

[tidal hearth]

yes

[tight lodge]

Someone is gonna get yelled and chewed up later

[harsh matrix]

Sky flats failed this morning

No idea how good or bad tracer panel flats will be, guess we'll find out.

[crisp flower]

Fingers crossed

[harsh matrix]

So of course the screws I ordered got delayed and the foam strips I ordered got here today.

Always turning a 1 day project into a multi day ordeal.

It is redemption arc time for the RC

[silver ibex]

You finally understand what the cause of the issue is?

[slate falcon]

[harsh matrix]

Im confident

Ill put it that way

A combination of several potential factors, all of which are not good for the system.

[harsh matrix]

This decoupler wasnt made in the smartest way either

Holes everywhere

Easy for light to leak in even if i thought it was safe

Its possible it is worse than I thought.

[slate falcon]

use some c4 to plug the holes

[harsh matrix]

I did this to fix light entering into the light path

Thin foam strips around where the decoupler's focuser tilt plate will hover over the classic focuser connection.

Double layered because one was just barely not thick enough

These can crush down to about how thick a single strip is.

This stops all light lol

The other issue was a general problem with the way the decoupler sits on the back of the scope.

This isnt a good seat

[slate falcon]

the foam

[harsh matrix]

They use this 3D printed ring to try to stop that

But due to printer tolerances, it flops around and stuff if you dont secure it in place or attempt to space it right using tape or something.

I used a tiny piece of the foam stripping to get is seated tight, no longer moves easily, and actually stops most of or all of the light there.

[runic violet]

Lol wot

[harsh matrix]

I had tape around the gaps on the outside to stop light but it tended to lift very subtly which could have been causing leaks.

[harsh matrix]

Yeah

Stupid

Very dumb idea on their behalf.

Didn't work at all

[runic violet]

Why don't they machine it lol

[harsh matrix]

Good question

[runic violet]

They machined everything else

[harsh matrix]

Same thing goes for the little cover for the screws on the outside lmfao

That thing is 3D printed and can also flop around

Meaning the holes it is supposed to cover are almost always partially covered, not fully covered, also permitting more leaks.

[runic violet]

This isn't a serious product

[harsh matrix]

I guess it isnt

Maybe they used some 3D printed parts to cut down costs.

Either way they werent well thought out

Also i didnt drill the holes terribly well so those would leak like too, most likely, had i not buried the screws under layers of flocking material the last time I had the mirror out.

The hole cover is the lighter black ring on top of the decoupler.

That one sucks too.

[tight lodge]

This is exactly what people have to do tho them "SkyWatcher shitty light leaking mirror cells"

[frosty shard]

hmm...if I ever decouple I'll probably stick with Nateman's decouplers at this point

[harsh matrix]

@frosty shard the guy's username on CN in this RC6 thread

[harsh matrix]

yeah

[harsh matrix]

im half wishing I did that instead

wouldve been done cleaner/more methodically

wouldnt have been so problematic.

btw i was planning to remove the primary mirror to do all of that work on the decoupler but that turned out to be unnecessary as I was able to patch everything up by removing the tilt plate alone

[harsh matrix]

@frosty shard @crisp flower welp we have a crater

but as I said

didnt have sky flats and there were a lot of issues I wasnt even aware of

this could easily go soon

ngl, it's very flat beyond that

we'll see what happens once more of these upgrades are underway

[crisp flower]

I'll Just Hope that thatll be it

I might be able to Test again tonight

[frosty shard]

What galaxy is this?

[harsh matrix]

NGC 4725

sum weird going on with the stars

i thought this was a heat plume and that it would go away eventually but it did not

[harsh matrix]

well the tilt adjuster leaks all the way around

and if there was enough light getting through it could easily enter the light path

aka

cause a perfect internal reflection

something like what im seeing

in theory

it would be more than enough to introduce variability in how well the ring corrects out though

that's my primary concern and what I fear the most rn

oh yeah

had clouds too

to like

very not ideal conditions or night in general

far from ideal scope config etc

just not great but the bg looks nice aside from the ring

cant be too upset

that's the best it's been in months

an honest attempt at a DBE

and

wow

really quite nice

[harsh matrix]

looks like a pinch of coma

which is good

cause im about to mess up the collimation

[harsh matrix]

we have turd colors since the data was very limited and not good

i clone stamped the crater out

the patchy background is thanks to the clouds and very limited integration

[harsh matrix]

okay I took these flats in broad daylight, left side was with the tracer panel over the front on top of the dew shield, not on, and the right side was with the panel on, and I put my scope's dust cap on the back of the flat panel to prevent over illuminating the entire scope

would such a drastic difference in illumination be indicative of a light leak?

this smells super fishy

@slate falcon ?

[slate falcon]

it looks like light leak

[harsh matrix]

[harsh matrix]

it alters how well the crater is correcting

each corresponds to the above sides

slightly enhanced

[slate falcon]

huu

[harsh matrix]

it is almost better corrected on the right though still bad

so it was as I suspected for a while now

some sort of nearly undetectable light leak wreaking havoc

shouldnt happen any more after i am done with the back of this scope tomorrow

[harsh matrix]

I subtracted the right flats from the left

there's a pretty obvious shift in the direction the light comes from between the two and im not sure as to the exact mechanism of that

but

what I see are rays here, looks like streaking

part of what I think is going on

[slate falcon]

the spot is there!

[harsh matrix]

yes

the fact that there is an obvious difference between how each set handles it is the reason why there's a difference in the degree to which it corrects

[slate falcon]

tha makes sense

[harsh matrix]

Oh btw I used a dew shield like I mentioned

And it helped with reflections and extra light big time.

Thats why the background is so flat with the exception of the crater and the mechanical vignetting that probably will never correct.

[slate falcon]

[tall summit]

I think I will be pulling a trigger on 585MC Pro today

you guys are happy how it works with your RCs?

any issues with stars getting blown out?

I ususally shoot with up to 2min exposures

should be ok?

[slate falcon]

the zwo one?

wouldnt it make more sense to get a P1 one

or a touptek

[versed roost]

you know you want mono

[slate falcon]

https://www.touptekastro.com/en-eu/products/atr585m?variant=51680125059384

not suggesting anything or anything

[tall summit]

I am running on Asiair mini for the time being

[slate falcon]

better earlier tbh

bc that means less zwo in ur life

and access to better cams

[tall summit]

I actually don't) decided to not get into it for multiple reasons

but in general, the idea is to use it for a small DSOs and occasionally planetary

[slate falcon]

https://www.touptekastro.com/en-eu/products/atr585c

you know you want itttttt

blue cameraaa

[frosty shard]

RGB GAMER SCOPE WHEN

[tall summit]

down the road, I want to pair 585 with a fast newt. Interestingly, Sharpstar 130mm F2.8 newt with 585 has almost identical FOV as my RC with the reducer and 2600

but it would be at F2.8

[frosty shard]

Go directly to mono. Do not pass go. Do not collect $200.

But tbh for lunar and planetary you'll probably be totally fine (if not better) with OSC; planetary processing software really doesn't do well with mono data as far as I've seen. Where mono really shines is with DSO data

[tall summit]

but generally speaking, you guys are happy with 585 and RC match?

[harsh matrix]

Light leak is totally dead.

[harsh matrix]

Most of us do not use the 585 with the RC.

[tall summit]

Hm, I was pretty sure at least a few people here had it

[harsh matrix]

@vapid patio does and I think that's it.

[tall summit]

maybe i was thinking of 533

[vapid patio]

Me what

[harsh matrix]

The extra small pixels makes it a royal pain since it needs extremely precise guiding.

[vapid patio]

Oh I love my 585

[vapid patio]

Correct but the Ha sensitivity “I’m mono” makes all the difference for me

And you could bin if absolutely necessary

[tall summit]

on a good night I get to ~0.35-0.5 rms

[tall summit]

You use it with rc6 or rc8?

[vapid patio]

Rc6

Rc8 I feel even with a reducer would be too narrow

[tall summit]

other then planetary, I want to use it on a small DSOs and close ups like Pillars, Ring, Crab etc

galaxies

[slate falcon]

pillars would look good in the nho palette

[frosty shard]

I use an ATR533M, one size up

[tall summit]

Yeah I realized

[frosty shard]

Eh, the guiding doesn't need to be any better than with a 533, since you're already oversampled. The size of the pixels doesn't affect the PSF size in arcseconds/physical size of the PSF at the focal plane

But your stars will be larger overall

[frosty shard]

Whether you use OSC or mono though, I would also recommend having an IR filter on hand to take advantage of the 585's good QE in the band

IR is way less light polluted and you have a wider window of the night to image it

the Bayer matrix becomes irrelevant beyond 850 nm

but even a 685 nm filter will give you good results

[tall summit]

great point

[frosty shard]

oh and check out my new CN status

[tall summit]

@frosty shard there is that sv240 filter too

[slate falcon]

how tf can it have negative transmittance, what is the point of adding negative transmittance to the graoh

why didnt they bottom it to 0???

and 105%???

this graph is silly

[tall summit]

indeed

sv220 graph looks normal, dont know whatsup with this

[frosty shard]

Oh right, it's funny because this filter is kinda useless for refractors because of the giant IR passband, but it's probably a really good pairing with the RC + 585

[tall summit]

but anyway, to iluustrate the band

With Sharpstar newt that I am planning on getting, 585 gives the same fov as my current RC + 2600

but at F2.8

[desert locust]

if the sampling is the same, then it does not matter the f ratio afaik

[tall summit]

Meaning vs. my current F6 rig

[desert locust]

huh

[tall summit]

Same FOV at much higher speed

[slate falcon]

how big is the sharpstar?

appature wise

[tall summit]

130mm

[desert locust]

if its the same apeture and same sampling then f ratio does not matter

[crisp flower]

@harsh matrix i think the nightmare is over at my end?

(not me attaching the wronng file at first xdd)

[harsh matrix]

Hot

Id say it is over for you too

It may be over for me now that ive fixed the issues with the decoupler.

[crisp flower]

jup

[slate falcon]

yk decreasing appature decreases light gathering

also upping sensor increases light gathering

[tall summit]

Resolution uou mean

[slate falcon]

so big sensor + 6" gives you much more light than a 585 with a 130mm

if they are both the same fov

the 6" will give you more light

[tall summit]

Different camera sensor size, different pixel size

[desert locust]

wait, is signal different then snr

[tall summit]

@slate falcon F2.8 system would gather the same amount of light about 4.6 time faster than the F6 system

Apperture is irrelavnt here, it defines maximum angular resolution you can get

[slate falcon]

not if the fov is the same ;-;

if you have the same fov

appature is what is what gives you more signal

@frosty shard am i right

im counting overall signal

not per pixel signal

[frosty shard]

Yes, correct. Larger apertures get you better signal no matter the f-ratio, in terms of total number of photons collected

You have to do the comparison in terms of etendue

[slate falcon]

what the flip is an eten dew

[frosty shard]

https://en.wikipedia.org/wiki/Etendue

[slate falcon]

also crab nebula but weird

[slate falcon]

aa

[slate falcon]

im having so much fun with the new filter

[frosty shard]

the general idea is that your physical aperture governs how many photons you can gather in a given unit of time, but you're also distributing those photons across a sensor

if you take any imaging system and scale it up 2x, you'll get 2x the SNR - the reason being that you have 4x the light gathering capability, 4x more pixel area, so you get 4x the photons per pixel and thus a 2x reduction in shot noise (since it's proportional to the square root of the photon count)

even with a slower system, you can still get identical SNRs at the same absolute aperture, as long as your pixels are scaled to match the change in focal ratio

Etendue isn't precisely "speed" in an f-ratio sense, but it captures the fact that your photon gathering power is dependent on the absolute aperture and how much angle the pixels subtend

f-ratio works in many cases just because we work with pixels of similar sizes

you can't rely on it alone when comparing systems that have different pixel sizes

Oh, one other thing I should mention: you can think of etendue in terms of either the pixel scale or the full sensor scale, but the pixel scale probably gets the better comparison of what you think of as "speed"

pixel_etendue = light_gathering_area * pixel_scale

(you can of course augment that with transmission characteristics of your system and sensor:)
pixel_etendue = light_gathering_area * transmission * pixel_scale * band_QE

For reference, the etendue of my rig is 27105 mm² arcsec², accounting for the mirror transmission

Throw in a 0.67x reducer and it jumps to 60383 mm² arcsec²

wait sorry I calculated that wrong

my scope is 6776 mm² arcsec²; with a 0.67x reducer it jumps to 15096 mm² arcsec²

A Redcat 51 with an IMX533 sensor has an etendue of 19631 mm² arcsec², but with an IMX585 it drops to 11668 mm² arcsec² due to the smaller pixel size

[tall summit]

I just pulled a trigger on a Sharpstar!

@frosty shard good info

[frosty shard]

You wanna know what your etendue's gonna be with a 585?
||111490 mm² arcsec²: no, I didn't double type the 1||

[tall summit]

@frosty shard please! and 2600

[frosty shard]

189236 mm² arcsec²

You've been using the ASI2600MC with your RC right?

[tall summit]

yes

[frosty shard]

Wait hold up I got the units wrong the first time (I keep forgetting to use the radius instead of the diameter when calculating areas). These are the correct values:

• RC6 + 0.67x reducer + ASI2600MC: 8772 mm² arcsec²
• RC6 + 0.67x reducer + ASI585MC: 5252 mm² arcsec²
• Sharpstar + ASI2600MC: 45096 mm² arcsec²
• Sharpstar + ASI585MC: 26569 mm² arcsec²

I have assumed 96% minimum reflectivity per mirror in all comparisons so these are conservative estimates

You can compare these etendues linearly

[tall summit]

much higher values for sharpstar

[frosty shard]

So basically you can say that the Sharpstar + ASI585MC has 3x the "speed" of the RC6 + 0.67x reducer + ASI2600MC

as in, it'll take 3x less time to achieve a similar SNR

[tall summit]

and its not that mach smaller in aperture either in terms of resolution, comparable. 130mm vs 150mm, with smaller center obstruction

[frosty shard]

Your resolution really is dependent on the maximum extent of the exit pupil

The effect of a large CO can be deconvolved out

The biggest impact it has for imaging is just blocking light

so the effective angular resolution is pretty much the same

[tall summit]

Thank you, that what I was trying to say to @slate falcon , but couldn't back it up with specific numbers

now with 2600 it should really shine'

[frosty shard]

Oh wait it's the 130, I assumed it was the 150. I'll get you revised numbers

[tall summit]

come milky way season

[frosty shard]

• RC6 + 0.67x reducer + ASI2600MC: 8772 mm² arcsec²
• RC6 + 0.67x reducer + ASI585MC: 5252 mm² arcsec²
• Sharpstar 130 HNA + ASI2600MC: 41624 mm² arcsec²
• Sharpstar 130 HNA + ASI585MC: 24676 mm² arcsec²

[frosty shard]

Slightly lower speed increase, at 2.8x, but still a huge improvement

Btw @tall summit do you have eyepieces? I'm really curious how the Sharpstar fares for visual

[tall summit]

I do

[frosty shard]

tbh I'd categorize it more as an alternative to binoculars than a normal telescope given the massive 6+ degree field

you could probably spot the Andromeda [O III] arc, SDSO 1, with it

I'm not even joking, it's been seen in binoculars

It will be utter hell on your eyepieces though lmao

Unless you got Naglers or Panoptics

[tall summit]

still worth looking through it out of curiosity

[frosty shard]

I don't even think Plossls will cope well at f/2.8, even though they're generally the best of the cheap eyepieces, but if you're not too bothered by edge aberrations it's totally worth a look

[tall summit]

its coming on 20th!

[frosty shard]

Oh that is some fast shipping

[tall summit]

they clain full frame corrected 44mm imaging circle

should be plenty for aps-c and anything smaller

[slate falcon]

res loss

[tall summit]

I dont know 130mm vs 150mm in b7 and not that great seeing

its not like I am getting max out on my 6"

[frosty shard]

Yeah obviously etendue isn't everything; you can cheese it by having huge pixels and ultra wide fields but you're not gonna get high resolution images that way

The RC6 will probably do better over galaxy season

Actually @tall summit do you have a first light target in mind for the Sharpstar?

[tall summit]

Some star field or cluster to test alignment, Rosette, Horshead

I can catch Cygnus in the mornings

Sadr area

[frosty shard]

My first thought was actually Markarian's Chain

Leo Triplet could also work

Those are all with the 585

And the Rosette for good measure (it's a big chungus)

And one more option: M81 + M82 + NGC 3077

[frosty shard]

That's a smol chungus

[slate falcon]

ya!

[tall summit]

I didnt buy 585 yet, pulled a trgger on a scope first

With 2600 its gonna be super wide

[tall summit]

Woo-hoo, 585Mc Pro order placed as well!

[harsh matrix]

You know the more I think about it, the more convinced I am that the ring issue im facing is due to the decoupler not having that beveled surface.

You can see it here with the normal focuser attachment point below the foam, and then the decoupler focuser attachment at the very top.

Without that surface to prevent the focuser from moving, most likely this is introducing play,

Enough to affect the scope throughout the course of an entire night, but not enough to really see or feel.

I think ill be ordering the baader steeltrack tonight.

Or maybe

I have bills to pay first. 💀

[versed roost]

what

[desert locust]

its true afaiik

you getting same amout of light per pixel

[versed roost]

light per pixel doesnt meen f ratio doesnt matter, there are plenty of other important quantities

[desert locust]

you can have a fast scope with small pixels be the same as a slow one with big pixels

[versed roost]

then you want the faster f ratio so you can use a bigger sensor for higher resolution

[desert locust]

im just talking about the snr affects

[versed roost]

larger sensor provides higher signal, you are capturing more of the image circle

[desert locust]

tbh, ill finish this argument tmr, im struggling to stay awake lol

[versed roost]

i mean i know what ur talking about, the snr per area is the same, but why not go for a larger area if you can

[waxen mountain]

Here 4h on M51 with wavelets transformation which unfortunately caused a lot of noise

[crisp flower]

Looks good nontheless

The Galaxy-Cluster at the bottom is pretty cool

[waxen mountain]

Thanks mate

[frosty shard]

@tall summit what's the focal length of your longest eyepiece? I think you'll run out of exit pupil at 20 mm eyepiece FL (you get a 7 mm exit pupil) so I'd start there (that's gonna give you 17x magnification)

[tall summit]

I have an 25mm eyepiece, nothing fancy

ordered 585 last night too

[harsh matrix]

i might be capping but that ring looks like it may be better defined in my flats now

that might mean better calibration

fingers crossed what my eyes are seeing isnt a lie

yeah

looks very even all the way through

[harsh matrix]

sky flats failed again

except this time, the computer left me a clue

when i remoted into the computer, I noticed the last image taken was of an empty, starry region of space, not my target, and nothing I told it to slew to

[slate falcon]

i noticed it immediately

[harsh matrix]

I noticed it tried to take the flats but failed all the way down the sequence

so for some reason, it isn't bright enough when I am trying, I even delayed by 5 minutes and it still wasn't bright enough

[harsh matrix]

fr?

i dont think it's that obvious

perhaps it is

cause you dont need to ABE the flat to see the ring now

i had to to see it before

since sky flats failed, i used the tracer panel as a diffuser for the sky again

which is what that flat is

[harsh matrix]

*just to dim it down

otherwise it is way too bright

[frosty shard]

As Vel mentioned some time ago, it's Zwicky 6057

[frosty shard]

Oh god...

[harsh matrix]

I remember Zwicky because he is one of the first people who figured out dark matter might be a thing

[crisp flower]

Noted

[frosty shard]

Also I Zwicky 18 is one of my favorite galaxies

[harsh matrix]

whaaaaat the hellllll

i had no idea this was a thing

this is awesome tf

[silver ibex]

The PGC designations has the first digits of e

The fact that it was the first thing I noticed really shows my need for grass-touching

[frosty shard]

Wait this is sicc

[slate falcon]

yea

[frosty shard]

Who'd have thunk there might be Population III stars just 50 Mly away

[harsh matrix]

yeah actually

[frosty shard]

(controversial claim, but the He II emission is something that's only expected to be seen in places where Pop III stars are forming)

[harsh matrix]

still there

i think this is a flexture issue

from the focuser

due to the beveled edge thing ive mentioned

[silver ibex]

Oh my that's a small mf

Insanely tiny

[silver ibex]

This one I mean

[harsh matrix]

gets pretty bad after DBE

[silver ibex]

@harsh matrix With the CT8 and the Paracorr and a 571 I get a juicy 1.3x0.86° fov with 0.75"/px

[harsh matrix]

jesus

[slate falcon]

so close!

[harsh matrix]

this data had much better SNR than the last 2 time i shot it though

[harsh matrix]

yeah

[slate falcon]

i noticed that too

[harsh matrix]

i think the new focuser idea will be what does it atp

i think this one isnt compatible with the way the decoupler is made

[slate falcon]

what is it

[slate falcon]

aa

[harsh matrix]

the GSO made focusers and tubes/rear of the RC have beveled edges where the M90 fittings fit to each other for the focuser

they face up and away from the inside of the tubes while the edge on the focuser points into the scope

having these 2 45 degree angle beveled edges fit together that way will stop movement in all directions when the focuser is tight

the decoupler is missing a beveled edge while the focuser isnt

at worst, the focuser isnt even properly engaged with the decoupler, leading to flexture in all situations

regardless of how tight i get the thing

i cant make the collar turn anymore and this still happened

[slate falcon]

o

[harsh matrix]

the decoupler is as tight as i can possibly get it, and so is the baader click lock

the focuser is the only place left to blame

[silver ibex]

Talking about focusers, I need to get a custom CNCd adapter for my focuser, any considerations? I was just thinking a curved piece that directly attaches to the tube with four screws. I don't know if higher end manufactures do anything different (I'm thinking about possible light leaks fixes)

[harsh matrix]

yeah @slate falcon this still looks like something is moving, no?

the background is much more even beyond the crater

either that

or a plain under correction or something

[slate falcon]

hmm

[harsh matrix]

i took these in broad daylight

[slate falcon]

its like a line of overccorrection then another line of undercorrection

[harsh matrix]

ofc cause i used the sky to illuminate the scope through the tracer panel

[harsh matrix]

yeah

looks like the answer is complex

[slate falcon]

yea

[harsh matrix]

the edges did correct better though

am i crazy?

fingers crossed sky flats do better

or something else does better

[harsh matrix]

@slate falcon okay I took some flats with the panel on and the dust cap roughly centered on the back of the tracer panel so the thing wasnt totally saturated in sunlight

COMPLETELY different

now we're potentially looking at a skill issue or flats taking issue over all else

[slate falcon]

maybe if you make a bigger co

[harsh matrix]

I think this set under corrected too btw

[slate falcon]

it did

[harsh matrix]

totally raw looks like this

[harsh matrix]

almost like the flats did nothing

except there's no motes?

weird af

[harsh matrix]

i think you have to use a curved piece to fit the shape of the tube

otherwise you potentially leave the gap around the focuser open as a path for light to pass directly through

[silver ibex]

So this pretty much

[harsh matrix]

if you make it too complex it can get expensive and quick

I used PCB way to CNC an adapter for my roki

[harsh matrix]

I think that will work as long as whatever you have in mind pans out

[silver ibex]

I'll try getting an instant quotation with JLC CNC or sum

Around 37$ for aluminium 6061

Anodized red

Not bad

Oh and decent tolerances too, 0.05mm

[harsh matrix]

@crisp flower @frosty shard another user in the GSO RC FB group with the crater of death.

Notice bortle 8.

[harsh matrix]

That might be better than the tolerances PCB way advertise.

[crisp flower]

Interesting

[harsh matrix]

He is using a reducer

Doesnt specify which

Thats a heavy crop which tells me his corners are not calibrating either.

[silver ibex]

I'm paying extra for them though, it's cheaper if I just use the standard

[desert locust]

i feel like the flats were overcorrecting the center

[harsh matrix]

@slate falcon the sky flats look even better.

Im trying some tracer panel flats at mid to max brightness rn at night.

sky flats result is nearly flawless

it's still thre, ever so slightly

[crisp flower]

Much better than before tho imo

I feel Like Skyflats are mandatory tho
Because im having this now

[harsh matrix]

Yeah by far

[harsh matrix]

Yikes

Is that with flat panel flats?

[crisp flower]

Jup

[harsh matrix]

That's weird af

[crisp flower]

Ill try Skyflats when im Home later
Lets See If that calibrated Out then

[harsh matrix]

People are laughing at this like this isnt a 10 fold improvement lol

[crisp flower]

Xd

[harsh matrix]

Have you fixed the light leaks in thag focuser?

[crisp flower]

I have
I think that this could be a result of a light leak around the guide Cam, If thats the results of one

[harsh matrix]

Oh OAG's leak yes

You should investigate that next

[crisp flower]

Well i'll Just Flock the hell Out of it then xD

[harsh matrix]

lol do it

uhhhhh

tracer panel flats

not too bad but it's more obvious than the sky flats

this is what happens when i subtract the tracer panel flats from the sky flats

[harsh matrix]

That gradient is the gradient from the sky

[frosty shard]

You should try dividing them since flat frames are intended to be multiplicative

I don't think it'll make a huge difference

But it's the best comparison

[harsh matrix]

those maximum brightness tracer panel flats caused these internal reflections

but the intensity is extremely small

this is super super stretched after huge denoise

[harsh matrix]

ehhhhh

there's a difference but no crater

meaning flexture is most likely the reason why the crater survives calibration

to recap everything i learned thus far

there was some light leak the whole time

it evaded all manner of testing I did, it was in a weird place, and no amount of attempting to hide it worked

that was the primary cause of the variability ive observed in the effectiveness of flats, and how they differed from set to set

this is progress

[slate falcon]

[harsh matrix]

youll have to tell me what you think of my conclusion here

if you agree or not

[frosty shard]

There definitely has to be something circular in nature to get the effect you keep seeing

[harsh matrix]

ive accepted that we cant fix that

it seems to be some artifact the RC's are stuck with

the best we can do is try to calibrate it out consistently

[slate falcon]

[harsh matrix]

it looks like the math checks out

I can thread the apex directly to the steel track

that solves another possible issue if that's even enough to cause a problem

the color data came out very nice

this is 1 hour per channel

[slate falcon]

[harsh matrix]

we're back

[chrome kite]

this thread is 90% issues 10% beautiful images

[crisp flower]

Yes

[tight lodge]

Because beautiful images are backed by issues.

[slate falcon]

i like :3

[tight lodge]

HST. Badly ground mirror and it needed servicing in space to make it usable.
JWST took 30 years to develop and it took so long because of different issues

[tall summit]

My Sharpstar and 585mc Pro is out for delivery!

[tight lodge]

Why ZWO😭

[tall summit]

I am on asiair, and others are not cheaper really here in US

[crisp flower]

isnt visable too obviously with a very quick n dirty edit

[slate falcon]

whats you lookig for?

[crisp flower]

Dark spot

[slate falcon]

ahh

the void

i put my gs on the top and now it looks too silly

(trying to reduce top heaviness and it kinda worked)

(top heaviness as in all weight near the secondary)

[crisp flower]

That Looks funny ngl
I love it xD

@harsh matrix I have now flocked the oag
If the weather allows it i'll get the collimation somewhat recently done tonight and then Look for some small Galaxy that Looks cool

[waxen mountain]

Very nice pic :D

[crisp flower]

Thank u

[harsh matrix]

hell yeah

good luck

i think im going to give my DSD OFP2 another shot, specifically to test the flexture theory.

if confirmed, I will order the baader steel track since the focuser is the final suspect

[harsh matrix]

got a weirder gradient after last night

the corners definitely interfere with DBE so when I crop them out to about here, DBE does a fantastic job taking care of the rest

looks like it vanished

@crisp flower

@frosty shard too

OHHHHHHH

so when I saw it vanish in the past, the shifing of the frame would null out the hard edges, essentially wiping it out

okay i dont need to rush to get a new focuser then

so I think ill try to save another week

[frosty shard]

You're using the same focuser I am right (the Apertura rack and pinion?)

[harsh matrix]

yes

but this i dont think is specifically because of the focuser

i think it's because of the decoupler

the decoupler is not compatible with the GSO style focuser because of the beveled edge design on the telescope side

it's a hard 90 degree corner meeting a 45 degree beveled edge

this is a recipe for movement

[frosty shard]

Yeah I was gonna say, let me know if you think it's how they're coupled or if it's something flexing in the focuser itself

If it's the latter I gotta investigate

[harsh matrix]

it could be the latter as well but I'm most suspicious of the beveled edge design atm

that's what I suspect is the leading cause of movement rn

[frosty shard]

And I guess this may not be super helpful if @crisp flower is having these same issues (are you using the stock Crayford or some other focuser?)

[crisp flower]

Im on the Stock one

[harsh matrix]

the stock one flexes

cause

I was able to make it move with my hands

[frosty shard]

You know, I wonder if the classical Cassegrains will move to rack & pinion focusers

I actually hope not...since they're visually oriented scopes and I like the feel of the Crayford better

[frosty shard]

Is that the stock one with the RC8 or the linear bearing Crayford that came with the RC6?

[harsh matrix]

the stock one that comes with every RC outside of the carbonstars

the not linear bearing one

[frosty shard]

oh yeah I've heard those are kinda crap

Maybe good enough for visual but even still

[quartz meadow]

stock ones are horrendous for AP

[harsh matrix]

the color is so much more cooperative

[harsh matrix]

theyre awful

S tier bad

that's what Limepie is using

[frosty shard]

That would absolutely do it

[harsh matrix]

that's why I think they are having issues

[frosty shard]

I wonder if the rack and pinion upgrade is available in the EU now

https://www.teleskop-express.de/en/telescope-accessories-5/focusers-adapters-motorfocus-296/focusers-and-micro-transmission-92/ts-optics-2-5-rack-and-pinion-focuser-supports-up-to-6-kg-travel-95-mm-5769

Actually this might be worth the extra cost

I also love how the focuser is described as "powerful"

It's a 2.5" focuser with M63 threads, which seems to be more standard AFAIK (I see this thread on refractors)

Or there's this 2" focuser with M54 threads
https://www.teleskop-express.de/en/telescope-accessories-5/focusers-adapters-motorfocus-296/focusers-and-micro-transmission-92/ts-optics-2-inch-rack-and-pinion-focuser-with-additional-thread-for-accessories-up-to-5-kg-15797

I'd be happy to avoid M56 just because every M56 adapter I've encounter is internally reflective

You'd need this adapter though
https://www.teleskop-express.de/en/telescope-accessories-5/focusers-adapters-motorfocus-296/focuser-telescope-attachment-297/ts-optics-adapter-to-m90x1-for-the-rap2del-focuser-15800

[harsh matrix]

I dont think im a fan of either of those.

[desert locust]

https://tenor.com/view/druski-gif-18403588327596160789

[frosty shard]

Why not?

[harsh matrix]

That first one doesnt look to be short enough profile for what I need

[crisp flower]

most likely

i was looking for a replacement when i first got the scope but then they went out of stock annd then i forgot xd

[slate falcon]

im so happy, im consistently getting under my pixel scale

[haughty steppe]

Okay, this is my first colored image of bodes. Any other time ive imaged it it was only lum. 19x60s Lum, 2x90s RB, 1x90s G

[haughty steppe]

Nice, that is what we want to happen 😄

[slate falcon]

its consistent too!!!!

[slate falcon]

cuuutee

[haughty steppe]

ec mounts are to nice. If you ever find one for a good price, hop on it

This is what I was sitting around last night before clouds rolled in. My guiding is 5 second subs.

[slate falcon]

wats an ec mount

[haughty steppe]

encoder

[slate falcon]

aa

[slate falcon]

whats an encoder do and why does it make them better

[haughty steppe]

encoders is a system where the mount knows its exact position at all times. So, becuase it knows position, it can track really precisely and doesnt need much imput from guiding.

[slate falcon]

aa

my mount only predicts where it is afaik

[haughty steppe]

different mounts have different encoder sizes. But typically they have their position within .10", and can go smaller with larger encoder

[slate falcon]

sounds useful

i now need to find a new target

mines getting too low

[haughty steppe]

what fl and sensor?

[slate falcon]

675mm 585

im thinkin ring while i wait for sadr to rise

[haughty steppe]

Just looked at mine. My CEM60EC knows its position within .06" and has <.5 arc seconds of periodic error over 5 minutes.

broadband target is the goal?

[slate falcon]

i have one hour on some ifn

theres no way i actually get it

this one

[slate falcon]

no, im either gunna do HeII or Ha+Oiii

[haughty steppe]

with some 5min subs and a good denoise you could pull some out

[slate falcon]

im doing 120 min subs

i can do 5 buut i dont want sat trails to mess me up

[haughty steppe]

have you done headphones nebula? Or is that set for you already

[slate falcon]

its close to the ifn im shooting

xD

i think i should shoot the dolphin

or that popular part of sadr

im now tryna load 12° around c20 to do a bit of choosing

[quartz meadow]

hour is not going to cut it

[crisp flower]

still some tilt left. no flats so im not too sure if the dark spot is gon now

[waxen mountain]

https://tenor.com/view/h-o-l-y-s-h-i-t-boom-yes-oh-yes-yep-gif-15997893301937763341

[desert locust]

i gotta do a project on that

[crisp flower]

Yes

[desert locust]

ill do it after my bb m106, and get heavy nb on it

[crisp flower]

Niiiice
I did a single sub of m106 before i decided to Stick on that one

[digital nexus]

can someone

explain

why

the GSO Tilt plate COVERS THE PRIMARY COLLIMATION SCREWS

[tall summit]

Hey guys

Does this look about right?

Trying to bech collimate my new Sharpstar before weather alows a star test

[harsh matrix]

because it sucks

not worth the purchase