Does anyone know what happened here to Andromeda in the lower area (the dark section)? 170 subs, 15 sec. All I did so far was preprocessing, integration, and photo-metric calibration in PI. ASI294MC
not sure why it isn't letting me attach the jpg. here is link to google photo
Edited by Nbsdsailor, 20 November 2019 - 10:00 PM.