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Stacking 200 frames with the wrong dark frames for 4 months
I was shooting nebula shots and always wondered why my stacked images had this faint blue gradient no matter what I did. Last week I realized my dark frames were taken at ISO 800 but my lights were at 1600, total rookie mistake. Has anyone else had calibration frame mismatches mess up their processing for way too long?
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willowr961mo ago
The faint blue gradient thing is sneaky because it looks like light pollution or a lens issue, so you end up chasing all the wrong fixes first. What most people miss is that the mismatch does not just add noise, it throws off the whole pixel math, so even your good subs end up with a color cast baked in. Check the EXIF on every single frame next time, not just the ISO but temp and exposure too, because four months of guessing beats four minutes of checking.
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