This is a great book on understanding Exposure! I have read mine a few times and always refer back to it ever so often, When i first started my photography hobby everyone i talked to said I have to read this book so i finally ordered it and have learned a lot of good stuff from it. It's a very highly acclaimed book from all the great reviews and i can see why.
Understanding Exposure: How to Shoot Great Photographs with a Film or Digital Camera (Updated Edition) (Paperback)
For serious amateur photographers who already shoot perfectly focused, accurately exposed images but want to be more creative with a camera, here’s the book to consult. More than seventy techniques, both popular and less-familiar approaches, are covered in detail, including advanced exposure, bounced flash and candlelight, infrared, multiple images, soft-focus effects, unusual vantage points, zooming, and other carefully chosen ways to enhance photographs. The A-Z format make sit easy for readers to find a specific technique, and each one is explained in jargon-free language. Top Tips for each technique help readers achieve superb results, even on the first attempt.