DeepSkyStacker is a useful astrophotography tool to calibrate, register, and stack your images. This tutorial walks you through the basic settings I use.

Image stacking is the starting point in editing any deep space images. Read this Deep Sky Stacker tutorial for awesome astrophotography shots!

Deep Sky Stacker is a great FREE program for astrophotography. Check out this in-depth DSS tutorial so you can calibrate and stack multiple images.