Astro 60D – Dark Frame Comparison
▣ ASA1600, 450sec Exposure, Ambient air temperature 22℃
A. Original images (Center 1:1 crop)
B. Level emphasized in Photoshop :255 → 100 (Center 1:1 crop)
C. Level emphasized in Photoshop :255 → 30 (Center 1:1 crop)