for avoiding colour faults in your pictures for the calibration of your illumination useable for white balancing through white backside
Technical Details:
Dimensions (LxW): approx. 20 x 25 cm (2x) and 10 x 12,5 cm (1x) Thickness: approx. 2 mm Material: coated paper board Scope of Delivery: 1x Grey Card Set, 3 pieces