This is a collaboration project with my friend Renato Vilhena.
After taking 2h30m exposures using a 50mm F1.4 vintage lens at F2.2 in a Bortle 2 zone, still I had very little information of the IFN, with the IFN totally swamped by noise. After I added another session of 2h30m in same conditions.
Simultaneously I asked my friend to capture with his 50mm F2 @ F4 from a Bortle 3 zone, which yield +3hrs.
In the end my stack with 5h had a bunch of data from the IFN, but stars were unusable. The final image is a composition of my starless stack with his stack.
My stack was calibrated with darks and flats, but was hard to do a proper DBE of the image in pixinsight. I used to Siril to do the the starless image background extraction.
Interesting trivia is that my data was taken from northern hemisphere while his data from southern one.
This image was inspired by
@Ireneusz Nowak (iro) amazing capture:
https://www.astrobin.com/r6q9r3/?q=ifn%20m31
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