This site was one of the backup links to today's APOD. The degree of detail that it goes into on cameras, lenses, shutter speeds, and other settings far exceeds anything I've seen online. If you're a shutterbug like
Sgt John H. or
CW5 Jack Cardwell, you'll lijkely understand it better than I do. But if you've ever wondered how terrestrial photographers have come up with some the amazing APOD shots we enjoy, this is a good place to start.