purple halos | Astrobiscuit | Page 1

timber rover May 15, 2023, 7:19 AM

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all my stars are covered with blue halos and abberration
is there anything i have done wrong? did i focus wrong? or is my lens just bad? (im using an 18-55mm kit lens)
how do i fix this?
this is my second time taking deepsky astrophotos so pls give some tips on how i can remove some of the wierd things popping up on my photos

grand jackal May 15, 2023, 8:20 AM

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looks like vhromatic abberation to me

timber rover May 15, 2023, 9:05 AM

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is there a way i can like reduce its effect in photoshop or something?

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or even just avoid it beforehand

grand jackal May 15, 2023, 9:06 AM

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timber rover or even just avoid it beforehand

18-55 is a kit lens

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so get a non kit lens

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i think there are soem things you can do in ps

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pay up

timber rover May 15, 2023, 9:07 AM

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i have a 50mm ef lens

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would that be better?

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should i sacrifice field of view for quality?

grand jackal May 15, 2023, 9:08 AM

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f/1.8?

timber rover May 15, 2023, 9:08 AM

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yeh

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it has lots of distortion near the edges

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i have to heavily crop the image before i get anything good out of it

grand jackal May 15, 2023, 9:09 AM

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stop it down to like f/3.whatever

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a prime lens is usually better thana zoom lens

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and it has a bigger aperatur

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e

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@timber rover

timber rover May 15, 2023, 9:10 AM

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if i knew that before i swear i wouldnt have wasted hours of time lol

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thx man

grand jackal May 15, 2023, 9:12 AM

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didnt waste shit

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how much time did you spend trouble shooitng

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like while shooting

timber rover May 15, 2023, 9:13 AM

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like 3+ hours but thats only because im with my friend and he also has his own thing going on with me

grand jackal May 15, 2023, 9:13 AM

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you learned!

timber rover May 15, 2023, 9:14 AM

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unfortunately the next week or so is looking like rain here

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and then the moon will come up

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so ill have to wait like a month to try ur suggestion out

grand jackal May 15, 2023, 9:14 AM

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not a worry

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save up for a lens

timber rover May 15, 2023, 9:14 AM

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thx again

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im saving up for a tracker

grand jackal May 15, 2023, 9:16 AM

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might wanna look nitoa better lens first

timber rover May 15, 2023, 9:16 AM

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ok

grand jackal May 15, 2023, 9:16 AM

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actually nah

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50mm will do fine

timber rover May 15, 2023, 9:16 AM

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i might look into wider lens

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like below 30mm

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is that a gud idea?

grand jackal May 15, 2023, 9:16 AM

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i was thinking the other directions but anythign goes

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theres targetsfrom 8mm to millions of mm

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maybe not past a few thousand if youre on earth

timber rover May 15, 2023, 9:17 AM

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also another thing to ask u

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if u have time?

grand jackal May 15, 2023, 9:17 AM

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yuh

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i aint sleeping

timber rover May 15, 2023, 9:17 AM

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my images are very noisy

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like very very noisy

grand jackal May 15, 2023, 9:17 AM

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more integration

timber rover May 15, 2023, 9:18 AM

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this picture was 45 minutes plus

grand jackal May 15, 2023, 9:18 AM

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thats nothing

timber rover May 15, 2023, 9:18 AM

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really?

grand jackal May 15, 2023, 9:18 AM

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yeah

timber rover May 15, 2023, 9:18 AM

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how much should i aim for

grand jackal May 15, 2023, 9:18 AM

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you want 3 hours minimum

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well thers no minimum

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depends on how much noise you want

timber rover May 15, 2023, 9:18 AM

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bro thats like 100gb plus on my laptop

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oh yeah actually makes sense

grand jackal May 15, 2023, 9:19 AM

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lemme find somehting

timber rover May 15, 2023, 9:19 AM

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trackers get you higher exposure times

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= to less data per exposure

grand jackal May 15, 2023, 9:20 AM

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yeah

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longer darks tho

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not a problem with cooled cams

timber rover May 15, 2023, 9:20 AM

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i took 50 darks

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at 6s

grand jackal May 15, 2023, 9:20 AM

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thats enough

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timber rover May 15, 2023, 9:21 AM

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after around 7-8 the difference isnt too much

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so atleast 2-3 hours

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below 2h is like only noise

grand jackal May 15, 2023, 9:22 AM

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diminishing returns

timber rover May 15, 2023, 9:22 AM

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so in the end

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i should use a smaller aperture

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and

grand jackal May 15, 2023, 9:23 AM

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bigger aperature

timber rover May 15, 2023, 9:23 AM

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bigger?

grand jackal May 15, 2023, 9:23 AM

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aperature

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how big the light hole is

timber rover May 15, 2023, 9:24 AM

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but u said to take my aperture from f1.8 to f3 something

grand jackal May 15, 2023, 9:24 AM

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thats focal ratio

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uh

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yeah lower aperature

timber rover May 15, 2023, 9:24 AM

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so lower aperture

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and

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atleast more than 2h of data

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dont use zoom lenses

grand jackal May 15, 2023, 9:25 AM

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timber rover so lower aperture

stop down lens

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use prime lens

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more integration

timber rover May 15, 2023, 9:25 AM

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yes

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better get going now have a maths SAC tomorrow

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thsi getting me distracted

grand jackal May 15, 2023, 9:26 AM

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oki

timber rover May 15, 2023, 9:27 AM

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thx alot man

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if i remember ill send u the next photo i get

timber rover May 15, 2023, 10:17 AM

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also i couldnt stop thinking about this

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are there other things

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in the image that are off?

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things that i can improve using skill not equipment

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stuff that i wouldnt notice

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but someone with more experience would

grand jackal May 15, 2023, 11:04 AM

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gimme the stack

minor grove May 15, 2023, 1:48 PM

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timber rover all my stars are covered with blue halos and abberration is there anything i ha...

Could you share the raw stack? It looks possible to get a nice image (:

timber rover May 16, 2023, 10:47 AM

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grand jackal gimme the stack

ok

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sorry took so long to reply

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busy with tests and term exams atm

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https://drive.google.com/file/d/1YGqp0BIYJaN-3P1QqWSCi4n96CTc8P3r/view?usp=sharing

Google Docs

raw stack.tif

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this the closest i have to a raw stack

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pretty sure the only thing i did was give it background extraction on siril

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i also have the data i took from the 50mm

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but it has black line things on the side because my manual tracking wasnt very good

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https://drive.google.com/file/d/1w8bjf6tV7NaD0UXKedgCg1gJV1GuBQa4/view?usp=sharing

Google Docs

Autosave.tif

lilac flint May 16, 2023, 6:56 PM

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Dont stack in sequator

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For some reason sequator exaggerates the purple halos

sturdy raptor May 17, 2023, 1:32 AM

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You can get rid of the violet, but it has an impact on the rest of the data.

timber rover May 17, 2023, 6:23 AM

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sturdy raptor You can get rid of the violet, but it has an impact on the rest of the data.

already tried and got the same result

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carina nebula lost all its colour

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what if u make a star mask in photoshop

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and reduce the purple?

timber rover May 17, 2023, 6:26 AM

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lilac flint Dont stack in sequator

first time im stacking in sequator

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usually i use dss

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but didnt know that bit information

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thx

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maybe i could restack in dss

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but ive deleted all the photos already unfortunately

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next time 🙂

lilac flint May 17, 2023, 6:38 AM

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timber rover but ive deleted all the photos already unfortunately

Maybe try to strech the image a bit and then remove the stars with starnet

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Than remove the purple only on the stars layer

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And then put stars back

timber rover May 17, 2023, 7:16 AM

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gud idea

lilac flint May 17, 2023, 7:39 AM

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Just a correction. It is ok to stack with sequator. Sometimes the colours come out better . But in that case stack the images in dss and use stars from dss and starless from sequator

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That is what i do sometimes

timber rover May 17, 2023, 9:16 AM

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ok

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thx

timber rover May 17, 2023, 11:39 AM

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grand jackal gimme the stack

re stacking the images atm using deepskystacker

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so ill see the result and send it here

timber rover May 18, 2023, 6:30 AM

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timber rover re stacking the images atm using deepskystacker

btw i got the images back from recycle bin it wasnt that hard

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and i just got into editing the photo

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its appearing to have little to no chromatic aberration

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havent fully processed it tho

grand jackal May 19, 2023, 12:15 AM

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Nice

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I didn’t think a lens could have that bad chromatic avberation

timber rover May 19, 2023, 8:21 AM

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fully processed

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i cropped out the bad parts of the image

timber rover May 19, 2023, 8:23 AM

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grand jackal I didn’t think a lens could have that bad chromatic avberation

also if u want i can send the raw stack here if u want to have a crack at editing it

grand jackal May 19, 2023, 8:24 AM

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Sure

timber rover May 19, 2023, 2:26 PM

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https://drive.google.com/file/d/1AIVwnMeZrX48KvHgqPd4PsoxZ8Qu0fqF/view?usp=sharing

Google Docs

Autosave.tif

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pretty sure its this\

timber rover May 19, 2023, 9:30 PM

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it is this

timber rover May 20, 2023, 11:39 AM

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grand jackal Sure

pls send a result here so i can look at how gud the data is

grand jackal May 20, 2023, 11:39 AM

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ill tyry roght mpw

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of upi send the cutsey feet pics

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IMMEDIATEELY

timber rover May 20, 2023, 11:43 AM

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wat

grand jackal May 20, 2023, 11:43 AM

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feet

timber rover May 20, 2023, 11:43 AM

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did ur cat get on the keyboard

grand jackal May 20, 2023, 11:43 AM

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plsssss

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nope

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eden cox

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please feet

timber rover May 20, 2023, 11:43 AM

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https://tenor.com/view/spongebob-socks-gross-disgusting-foot-gif-17555518

Tenor

grand jackal May 20, 2023, 11:43 AM

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im kinda shit at processing ngl

timber rover May 20, 2023, 11:44 AM

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processing is like cooking

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throw random shit in there

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and hope its gud

grand jackal May 20, 2023, 12:02 PM

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@timber rover

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meseed up the starrs

timber rover May 20, 2023, 12:02 PM

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i think if u crop the edges it would look better

grand jackal May 20, 2023, 12:02 PM

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yeha

timber rover May 20, 2023, 12:02 PM

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the stacking artifacts making it looks pretty shat

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ok

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honestly it looks pretty gud

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just crop it and give it an s curve in photoshop or something

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im going to sleep its 10pm

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gtg

#purple halos