Each ExpoCap is constructed of a durable black ring mount securing an assembly of carefully selected acrylic materials. It is designed to fit over the end of the lens during the custom white balance procedure, and may be quickly secured in place by means of squeezing two small buttons on the exterior of the filter ring.

The ExpoCap Custom White Balance Aid is available in 52mm, 58mm, 67mm and 77mm filter sizes.

ExpoCaps are assembled in the U.S.A..