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! 30cm 12" 18% Grey/White Balance Card with Two Sides Double Face Focus Board, for Photograph Accessories ! ! This handy collapsible calibrator folds down and goes into your camera bag ! Product Overview: This Focus Board is the ideal accessory of the portrait, flower and conversion shoots. It has two sides, one is 18% grey with target "+" mark, the other side is white. All grey, target "+" mark and white surfaces of this focus board have their own function. This focus board helps to revert the color truly and perfectly by measuring the exposure value, white/grey balance value and color temperature. Whatever you used in film or digital photography, the 18% grey side can control expose value, the white side can balance the color and the target "+" mark can provide accurate center photometric. To calibrate your camera accurately you need a perfectly white card to set your white balance and a grey card to set your exposure How do I use a Grey Card? To measure your reference point, place the grey card in the area or scene in which you intend to take a photograph with the grey side facing toward the camera. For the most accurate results, place the card directly where your subject might stand or rest so that it reflects the light source. Then, adjust your settings to ensure optimal exposure and focus and take a test shot. Specification: - Color: Grey/White - Gray Side: Reflectance 17.8%, Density 0.74 - Max. deviation of reflectance: 2% - Other face color is pure white, could used for a small reflector Size: - Unfolded: 30cm x 30cm - Folded: 13cm x 13cm - Weight: 80g Package Includes: 1 x Focus Board with Grey/White Side 1 x Black Carry Bag