ITEM NAME:30cm 18% Foldable Gray Card White Balance Double Face Focus Board OZ 30cm 18% Foldable Gray Card White Balance Double Face Focus Board OZ a.imagelink a:hover.imagelink {color:#60000;.Size:30 x 30cm. 1 x 12 "/30cm Grey/White Balance Card. The distance between the lens and the gray card should be kept above 15 cm, and the gray card should be filled with the entire screen as much as possible, and any projection should be avoided on the gray card.
