Kodak Gray Cards - R-27 Author:Eastman, Eastman Kodak Company An invaluable tool for capturing perfect images! Correct exposure is the essence of good photography, and with these neutral test targets you can eliminate errors. When you take reflected-light meter readings off of a Kodak Gray Card rather than a subject of unknown reflectance, you are guaranteed more accurate exposures. You will be delighted b... more »y the "true-to-life" colors and tones in your photographs, digital images, and videos. The cards are also useful for calibrating exposure meters and determining lighting ratios. Package includes one 4 x 5 inch and two 8 x 10 inch Gray Cards along with complete instructions for use.« less