The flexible control card, made of special polymer, has anti-reflection coating on both sides: one side is white and the other is gray. The gray side serves as a reference area for exposure measurement, while the white side allows for proper white balance, which is crucial in digital photography. The handling couldn't be easier.

The camera takes a light reading from both sides of the control card to perform exposure or white balance measurement, and fortunately, the camera is perfectly adjusted for the prevailing lighting conditions to ensure perfect shots.