Because it’s that time of year … a fresh shot at a very familiar target during two clear nights in October. Ha, L, R, G, B with the QHY268M, but still facing problems with the Esprit and the Optolong filters.
Details at Astrobin.
Backyard astrophotography in light-polluted Cologne-Dellbrück (SQM 19.6-7)
Skywatcher Esprit 100/550 ED, Skywatcher Flattener, Optolong Ha 7nm / LRGB, QHY268M
OAG with Lodestar X2
Mount AZ EQ6 GT
Image acquisition: CdC, NINA, PHD2, dithering
Ha 24 x 600s, L 77 x 100s, R 15 x 200s, G 14 x 200s, B 14 x 200s, mode 1, gain 56, offset 10, -5C, 20 flats HaRGB, 40 flats L, 50 bias, 20 darks
Data calibration/integration: PixInsight
Image processing: PixInsight, Photoshop, Lightroom
And of course there have been some previous attempts at M31, in 2013, 2014, 2016, 2017 … hopefully some improvements since then … ;-)