Astronomy and Astrophotography for the Beginner and Try-Hard Amateur!
Hmmm... http://en.wikipedia.org/wiki/Dark_frame_subtraction for those of us not in the biz. Black is good. I dread to try it for my point-and-shoot.
yes, were they shot with dark frame substraction? a 5-10 min ISO100 shot of the sky might be nice :)
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