Aquatica's Focus/Zoom Gears for Canon EF 15-85mm F/3.5-5.6 IS USM Lens allows you to easily and smoothly operate the focus and zoom controls for this lens when it's housed in an Aquatica underwater housing (not included).
Use focus and zoom controls when camera and lens are in Aquatica underwater housing
Designed for use with the Canon EF 15-85mm F/3.5-5.6 IS USM Lens