59 AED tax incl.
This gray card is to provide a standard reference object for exposure determination in photography. Its apparent brightness (and exposure determination) therefore does not depend on its orientation relative to the light source.
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By placing a gray card in the scene to be photographed, oriented at a defined angle relative to the direction of the incident light, and taking a reading from it with a reflected light meter, the photographer can be assured of consistent exposures across their photographs.