Lastolite EzyBalance 30cm 18% Grey/White for Scuba Divers

Colour underwater moves with every metre of depth, so a reference card matters more there than it does on land. This is the 18% grey and white EzyBalance built in a waterproof form for divers, and it carries the same focusing target that lets a camera lock on and take its readings off the card.

It is a pop-up disc: 30 cm across when open, 1 cm thick, and it twists into an 18 cm bag at 78 g. Grey on one face for exposure, white on the other for white balance.