Ultimate Field Guide to Photography

This free ebook contains straightforward explanations of both simple, all-but-foolproof equipment like inexpensive autofocus point-and-shoot cameras and of sophisticated lenses.

It also covers important accessories; provides advice of all kinds, from key facts and basic tips for beginners to advanced techniques for skilled amateurs; and addresses the essentials of editing, scanning and printing, effective archiving, and more. Along with digital information, there is also a lot of material on traditional film, from old techniques to helpful sidebars on when to use film rather than digital. 

Author: National Geographic