OK, looking for a book title here. I want to know ALL about lenses. The heavy stuff. Different glass types, chromatic aberation, distortion, distortion compensation, lense types (ie rectangular, pherical etc) etc. I am not poetic enough to try to explain these things to other people so I need the assistance of a manual of some sort. For example, my attempts to explain pillow vs pincussion distortion usualy fails due to lack of a common ground with "non" photographers. I am not affraid of the 900 pagers. I want the bottom line, however rough it may be. Thanks for any input.