This Focus Board features two sides: one side is 18% gray and the other is white. The gray surface, target "+" mark, and white surface each serve a specific purpose. In both film and digital photography, the 18% gray side helps control exposure value, the white side assists in color balance, and the target "+" mark provides accurate center metering. This focus board aids in achieving true and accurate color reproduction by measuring exposure, white/gray balance, and color temperature. It offers a significant advantage in high-pressure shooting situations such as weddings or parades. Ideal for portrait, floral, and conversion photography. Specification: Material: PU, cleanable with water, includes a nylon carry case Size: 30 x 30cm / 12 x 12 inches Quantity: 1 PC Package includes: 1 x Focus Board with Gray/White Side 1 x Carrying Bag