AQUATECH RF 15-35 f2.8/14-35 f4

AQUATECH Canon Zoom Gear allows full zoom control on compatible AQUATECH Water Housings. The zoom gears operate in a smooth and responsive manner and are available for a range of different lenses. Each zoom gear is designed specifically for a certain lens, however some zoom gears can support multiple lens options.

Price: 189.95 from Wex Photo Video