Like the post above, I too should know all of this stuff. I started my photography in the 1970s with a manual Russian Zenit E camera, moving on to a couple of Minolta manual focus bodies (X500 and X700) and a collection of mostly Minolta lenses. However, I have to admit that since moving on to a digital SLR (a second-hand Canon EOS 300D), and gone through about three Canon digital compacts, I've slipped into the "always leave it on P, or if it is a difficult shot put it to the Auto setting" mind-set. Its always good to have these refresher lessons. Thanks very much - always enjoy Chit Chat across the Pond with Allison, and your blog.