#Darks offset with stars and targets?

9 messages · Page 1 of 1 (latest)

foggy jay
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After few hours of trial and error I gathered my courage to ask this question here.
I am complete beginner when it comes to image processing and astrophotography.

Q: When stacking (Deepskystacker) Light frames with darks + bias, the shadows in resulting image are in different position than stars and targets.
Is this a problem with my tracking when capturing images or something going wrong when stacking?

Subs were 30 seconds with tracking (not super precise, but no star trails in frames used)
I just feel I am missing something really simple here 😄

stacking_offset_error.PNG
foggy jay
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Another pic from C4

image.png
round latch
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Judging by the fact that the 'shadows' looking like the objects imaged, I'll ask: how did you take your darks and bias frames?

If I ever need to troubleshoot a stack, I'll first check over all my lights - deleting the potentially damaging / distorted ones - followed by stacking just my lights, no calibration frames
If this removes the issue then it is either your darks or bias that are likely giving you this issue

In this case, I would learn how to take these properly - bad darks / flats / bias can hurt your images more than having none

foggy jay
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I took darks and bias's as a part of ASIAIR PLUS plan, it was after the first light frame sequence.
The app recommended the shutter speed which I remember was relatively fast.

I will try stacking only light frames after work today to see if the problem shows up in results.

alpine crest
foggy jay
alpine crest
foggy jay
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Yeah, I clearly underestimated calibration frames. Need to take some new ones with lens cap now on.
So then you can basically use the same darks, flats and bias's with any target? And those are only to eliminate the noise your camera makes?

alpine crest