M94 - 2 hours

[proud moon]

Just to ask, why did u get more than 4 spikes?

Bad tracking?

[solid thistle]

Also ur uncollimated

[cedar rose]

I think ur slightly out of focus, also uncollimated mirrors. Fix those and that scope will perform

[sacred parcel]

i was slightly uncollimated and most of that weird blurring and stuff is from coma

[sacred parcel]

i am not out of focus

[sacred parcel]

double star

i think

[proud moon]

Mmm

Don't really think so

[sacred parcel]

linear image

thats not coma

[proud moon]

No u didn't get my point

Look at the brightest star next to m94

[sacred parcel]

uh yeah that's the brighest star

coma

[proud moon]

It's tracking issue tho

I think

[sacred parcel]

no, that's coma

[proud moon]

Can't be come

Coma affects stars on borders

[sacred parcel]

looks weird because of deconvulation or however that's called

[proud moon]

Stars in center of fov are supposed to be pinpoint

[sacred parcel]

so you see, if you are uncollimated the coma is in fact in the middle of the image

[proud moon]

Ahhhh

Gotcha, didn't know that

[sacred parcel]

yeah

[proud moon]

Why don't u collimate then hehe?

On a newt should be easy

[sacred parcel]

i did but then i accidently touched the like screws

it wasn't like locked in so it moved

[proud moon]

Ah okay, well happens

[sacred parcel]

it was 0:10 so i really didn't care at that point

[proud moon]

Hahaha i feel u

I just have 1 battery in my dslr so i can't waste time

[sacred parcel]

extreme example of coma where the star is just out of focus

[sacred parcel]

damn

[proud moon]

And when stuff doesnt go as i expect i just give up

Sorry oofff i keep typing wrong shi

[sacred parcel]

i actually have a coma corrector but i don't have the correct backfocus so a coma corrector makes the stars worse

[proud moon]

Woa

[sacred parcel]

i gotta buy some spacers

[proud moon]

If i have to be honest, idk how or why but i never calculated any backfocus

I just knew that to reach focus w my Rc i needed 2 spaces, and those were the one i got on

I mean, were included so

So u basically can't reach focus that's whatchu saying

[sacred parcel]

ah well i don't have any spacers so i have to buy them and actually calculate the backfocus

found the screenshot of the "worse stars"

[proud moon]

Weird stars

[sacred parcel]

on the right they look good but on the left..

[proud moon]

Actually it could be even tilt

What do u use to image

[sacred parcel]

like camera?

asi 585 mc

also what kind of tilt?

[little wyvern]

Doesn‘t have to

[sacred parcel]

[little wyvern]

Like, if your collimation is really shit, something like this can happen

[proud moon]

If ur imaging tube tilts, literally isnt anymore perpendicular to ur secondary mirror, u get in certain parts of the image slightly traily stars

In ur case seems like yeah, uncollimated scope

Tilt is more or less like this

If u see on the left and right in front of u, in the image ofc, it's all good

If u move to the right, trails

I got tilt for sure hehe

[little wyvern]

@sacred parcel What coma corrector do you have?

[sacred parcel]

beader mark iii

i don't remember the name exactly but it's something like that

[little wyvern]

baader?

[sacred parcel]

Baader MPCC Mark III

[little wyvern]

Ok

@sacred parcel this one?

[sacred parcel]

yes

[pastel orbit]

What gear did you use ?
Great image by the way @sacred parcel

[sacred parcel]

thanks,

• skywatcher 150p,
• asi 585 mc,
• eq5 pro,
• sv165
• imx 224 for guiding

[pastel orbit]

I also have an eq5 mount onsteped
How long each exposure?

[sacred parcel]

it's in the name

2 hours

[pastel orbit]

Not the total time

[sacred parcel]

ohh

180 seconds

sorry, read it wrong

tbh i think i should lower the exposure so i can possibly reduce the amount of satellite trails because there were a lot and also get better looking stars

[pastel orbit]

No worries
Another question
Do you have any images that you took with the 585 and your scope without coma corrector
I also want to buy the same camera but not a coma corrector yet(i have a 130pds)

@sacred parcel
That might be a good idea..

I don't know if you can process them out though
That would be helpful

[sacred parcel]

the image you just seen is without a coma corrector

if you look at any of my images they are without a coma corrector

i have a coma corrector but i need spacers do get the correct backfocus

[pastel orbit]

Have you done anything to remove it in processing?

Ohh i see@sacred parcel

[sacred parcel]

there is no way to fully remove coma in processing unless it's some very slight coma which can be fixed or reduced by using bxt

blurxterminator to be exact

still having no coma in capturing is way better than fixing it using ai in post processing

[pastel orbit]

Is the image cropped?
I am worried that coma will be a lot

[sacred parcel]

yes but i was uncollimated which made the coma worse

[pastel orbit]

Where can i find other images that you took?
And one last question
What rms do you usually get?
Thanks a lot

[sacred parcel]

1" - 2" but that depends on your guiding gear