Technology for Durability and Toughness


Dust- and moisture-resistant construction performs to spec in even the most rugged shooting conditions

A SLR camera lens is a precise optical instrument and an indispensable tool for the photographer. And these tools must perform to meet or exceed expectations in rugged conditions, rain or shine, indoors or out. At Canon, feedback from the professionals who actually use the lenses is an important factor in our efforts to boost lens performance. Shooting locations may be subject to dust, wind and rain. Assuming the severe conditions under which professional photographers work, Canon introduced dust- and moisture-proof construction in a newly developed series of super telephoto lenses in 1999.

Today, this approach is implemented with painstaking care: a rubber ring on the mount connection blocks the gap between the camera and the lens; focus ring, focus preset playback, and other moving parts are designed to be highly dust- and moisture-proof; switch panels and drop-in filter holders have been rubberized; even the zoom ring and zoom extension of the EF24-70mm f/2.8L USM are distinguished by dust- and moisture-proof construction. In the era of digital photography, the performance of professional lenses will be tested in an ever-wider range of environments, as the boundaries of imaging performance are expanded by these vital photographers’ tools. In response to this trend, enhanced durability and toughness are a constant concern for engineers engaged in lens development at Canon.