Canon EF 16-35mm f/2.8L II USM Lens Focus Gear - Compatible with RC1635II F for Smooth Manual Focus Control - Perfect for DSLR Videography, Vlogging & Cinematic Shooting

Focus gears allow access to the mechanical zoom function of many lenses. Use of these gears may require specific port extensions and may not be available for all housings and lenses.

This focus gear is specific for the Canon EF 16-35mm f/2.8L II USM lens.