This housing is generally used by photographers who need their equipment to be light and affordable. The carbon fiber sandwich core construction has two major advantages: extremely light weight and strong. Wtih the 10.1 and 15.1 mega pixels (respectfully), 9-point auto focus, and shooting at up to 6.5 frames per second, the Canon 40D and 50D are the ideal, light-weight solution for high-quality splash photography.