If you are serious about your astrophotography, you will probably want to do your own stacking and post processing. Turn on saving RAW data during capture and you will get one FIT file for every 10 seconds (or 20 or 30 if that makes more sense, although everybody seems to favor the 10 second ones). You can then do your own stacking, rejecting the bad ones with star, satellite or airplane trails. If all you need is pretty pictures to show your friends, the compressed JPG of the image stacked by SeeStar is good enough.
