I just returned from shooting sunrises/sunsets at Hilton Head, and am generally not pleased with the lack of depth of field with many of the photos. I'm now reviewing back to basics. In one photography book, Understanding Exposure, by Bryan Peterson, he suggests presetting focus by using the distance setting on the lens. In theory, I understand what he's saying, but in practice I'm confused as to how you line up the numbers. IF you want depth of field to infinity, you line it up with infinity? But if you want five feet, you line it up to five feet? I don't think that's what he's suggesting. Also, where do you focus initially? Foreground? Background? You can see my confusion! Please help. Your comments are more than welcome.