First usage of darks and the object I used to get an idea is the Dumbbell Nebula Messier M27. A total of 7 darks and M27 was 7 minutes exposed. The pictures were taken with Nikon D7500 on TAL200K. Stacking in DNGformat using DeepSkyStacker and final editing in photoshop CS4.
Compare the pictures between TAL200K above and TLAOP80/480 f/6 below.
