The galaxy season started, here’s a modest try at M51. See at Astrobin and below for more details.

Backyard astrophotography in light-polluted Cologne-Dellbrück (SQM 19.5-19.9)
Skywatcher Esprit 100/550 ED, Skywatcher Flattener, Optolong L-eNhance / Astronomik L-2, ASI 294MC Pro
OAG with Lodestar X2
Mount AZ EQ6 GT
Image acquisition: CdC, APT, PHD2, dithering
L-2: 102 x 400s, gain 60, -10C, 90 flats, 30 darkflat, 18 darks
L-eNhance: 47 x 900s, gain 120, -10C, 120 flats, 30 darkflats, 16 darks
Data calibration/integration: PixInsight, drizzle integration, 25% crop
Image processing: PixInsight, Photoshop, Lightroom