PhotoBert Photo CheatSheet for the Canon 580EX II SpeedLight. This is a one-of-a-kind CheatSheet for the Canon 580EX II SpeedLight. Professionally designed by a photographer - for photographers. Weather proof Small (about 4 3/8" x 7 3/4") Very durable - laminated in 10-mil laminate Small, but easy to read - high-quality print/stock