M 31 — The Andromeda Galaxy

Target & processing

I don't have the exact processing, but this image was acquired with my Sony a7II at that time (probably one of the worst camera for astrophoto), and the results is not great. Lots of problems, but I decided to post it anyway, as it shows where I started, and I'm when I see it, I'm happy to realize I did a long way since that image.

The full frame of the Sony a7II was creating a huge vignetting around the image, but with some flats it was possible to reduce this effect. However, I was not very familiar with the concept of darks / bias / flats calibration frame at that time, so it's possible I didn't acquired them properly. Unfortunately I didn't keep the raw files for this target, as I was limited to 30s exposure maximum (due to the Sony 'star eater' noise reduction algorithm, that tends to create black spot at the center of stars), I acquired a lot of subs, which was taking a lot of disk space. After a year, I did a cleanup, thinking that I wouldn't reprocess it.