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Hi Dennis, like Bill mentions, use RAW for your astrophotos, going to a lower quality jpg will only give you less detail.
For a free program get Deepskystacker for this, for moon and planet pics with your DSLR it`s not worth trying to stack 10 or so images as you won`t see any difference, you will need 100`s if not more to tease out the details with them. Registax is great for planetary and lunar images but is more suited to ccd`s that capture avi`s and fast frame rates.
The idea of stacking deepsky pics is to reduce the effects of thermal noise when doing such long exposures, something that is of no comcern with lunar shots.
cheers Gary
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