uWinka Standard 18% Gray Card / Skin Scale for (Double Side, Gray and White) The gray card is a flat object of a neutral gray color that derives from a flat reflectance spectrum. The typical uWinka gray card which contains two 8x10" cards which have 18% reflectance across the visible spectrum, and a white reverse side which has 90% reflectance. Note that flat spectral reflectance is a stronger condition than simply appearing neutral; this flatness ensures that the card appears neutral under any illuminant. The major use of gray cards is to provide a standard reference object for exposure determination in photography. 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. This technique is similar to using an incident meter, as it depends on the illumination but not the reflectivity of the subject. In addition to providing a means for measuring exposure, a gray card provides a convenient reference for white balance, or color balance, allowing the camera to compensate for the illuminant color in a scene. Features: Brand: uWinka Type: Standard 8X10'' Material: Plastic, paper and foam Dimensions: 254X220X2mm/10X8.6X0.08'' Weight: Approx. 190g/6.7oz (Two cards) Suitable for: Film Making Photography Use Flash illumination Package Includes: 2X Gray Card (One side is gray, one side is white) 1X Original Packing (The camera and other accessories are not included in those pictures.)
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