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The Gray Card is specifically manufactured for the photographer and printer to aid in determining exposure lighting ratios and color balance. The Gray Card is manufactured to be neutral gray on one side. The gray side is designed to reflect 18 percent of the light hitting it. On the other are instructions covering the Zone System of Photography - For Perfect Prints Negatives and SlidesLight meters and camera meters are calibrated to average the light reflecting off a scene so that the film will record the scene as average. The average scene will reflect approximately the same as a gray card or 18 percent . However if the scene is not average it is necessary to make an adjustment to the setting of your meter. This is the time to use your gray card. It will help you determine the proper exposure adjustments.
Photo Accessories Other Photo Accessories Calibration Equipment Camera Metering Accessories