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Help troubleshooting image

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#1 dum-dum

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Posted 05 July 2022 - 01:19 PM

This is a stacked image with lights and flats only. Note the corners. The problem seems to be with the lights, and I get this with all lights. Not sure where to start. Any help is appreciated.
 
Equipment
-Skywatcher esprit 80mm
-ASI071 camera
-Skywatcher field flattener

 

Fzz2X4R.jpg



#2 FrostByte

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Posted 05 July 2022 - 01:24 PM

What program are you using for calibrating and stacking? At a minimum, you need to add bias frames to your calibration workflow to calibrate your master flat, otherwise the calibration won't work and you'll have residual vignetting as you're seeing above. Try calibrating again with a set of bias (and darks, too) to see if your lights end up looking better.



#3 unimatrix0

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Posted 05 July 2022 - 01:26 PM

I think you got exactly what anyone get with only lights and flats. 

 

It's possible that your flats aren't correct either. As frostbite said above, we need to know if you took bias frames as well.    And how you made your flats. 




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