I took this image of the Andromeda Galaxy from the dark skies of Fowlers Hollow State Park in central Pennsylvania. This photo was made of a stack of 23 exposures. [Canon 70D, Canon 200 mm f/2.8 lens]. (1 x ISO 4000, f/3.2, 20 sec; 1 x ISO 6400, f/3.2, 20 sec; 18 x ISO 5000, f/3.2, 20 sec; 3 x ISO 5000, f/6.3, 15 sec) Tracking was done with an iOptron Sky Tracker and stacking in Nebulosity.