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Set consists of 2 cards 6X8 + 8X10 (approximately 15 x 20 + 20 x 25 cm) Perfect recalibration of exposure and color balance Each card has two sides: one side white and the other grey Grey side: reflection 17.8%; Density 0.74 White side: 92.0% reflection; Density 0.036Max. Reflective deviation: 2% max. Exposure measurement error: 1/8 F-stop