Readings in Digital Photography: The Science Demystified (Electronic book text)

The book gives clear, precise explanations of numerous technical concepts in digital (and film) photography, including focal length, field of view, depth of field, f-numbers, ISO speed, exposure metering, and "the infamous 18%". Emphasis is placed on what important terms mean, and don't mean. There's a little middle-school algebra, but the tough stuff is tucked away in appendixes. Learn what really goes on "under the hood" of your camera, and what the "experts" are talking about.