As a writer in photography as well asa photographer, I asked this question to many photographers. The Large format guys say 1 or 2, the portraitists say 4 to 6, the photojournalists are a different breed of cat. Cartier-Bresson said one will be enough if you know what you are doing, however several prominent members of that fraternity will admit to dozens or a couple of hundred. The "junk" I am seeing among digital photographers do hundreds to thousands and editing becomes an attrocity.

Lynn