Book excerpt: Achieving your desired effect is easy with this convenient, comprehensive guide to exposure. Five chapters explain light and exposure, tools of exposure, flash exposure, film and digital exposure and practical applications. A handy appendix covers ISO, converting EV changes to f-stop and shutter speed values, a glossary and index and includes a quick guide to exposing for film and digital. Easy to use and easy to understand, lavishly illustrated and packed with professional information useful to photographers at every level, Photographer's Exposure Handbook uncovers the answers to every question about exposure.