Book excerpt: Just open up this lay-flat, spiral, professional photoguide--with brightly labeled tabs for each section--for information on all KODAK films: care; storage; exposure; speeds; and lenses. Charts for slides and prints include a description of the film's intended uses and ISO speed and filters for daylight, tungsten, and photolamp. Dials help you calculate speeds and lens openings for existing-light subjects; filters; flash exposures; focal length; optical equations; and depth of field for several lens types. Plus: caring for and selecting supplementary lenses.