BackYardDSLRastrophotos

test: shoot at stable aperture and speed, vary the ISO. Shoot in raw, see how much latitude I have properly exposed ISO 1000 under exposed - ISO 100 speed 1/500 under exposed ISO 100 over  ISO 5000 WAY over ISO 51200

in Photo shop Auto align is the basic tool here is a tutorial https://www.youtube.com/watch?v=zzVSm64zq44 (he gets into smart objects!) also has a post processing video - I should watch https://www.youtube.com/watch?v=6sBrQ6yAcNI also lok at this https://www.youtube.com/watch?v=kMN_rpSe7MQ