Captured 2026-5-01. After doing a widefield on M101 on 2026-4-30 with my new RedCat 51, I wanted to see, how M101 turns out with my 500mm telephoto lens in comparison. This is the result.

300x 30s

25 calibration frames each

Star Adventurer GTi

TTArtisan 500mm f/6.3

ZWO 533MC Pro

ASIair Mini

Bortle 6

Stacked & processed in PixInsight (Stretching, SPCC, Background Extraction, Gradient Correction, NoiseXTerminator, StarXTerminator), final touches in Photoshop (star recombination & color adjustments)

i.redd.it