Howshot Zoom Gear for Canon EF 11-24mm f/4L USM Lens on Sea&Sea Housings

Howshot zoom gear enables zooming for the Canon EF 11-24mm f/4L USM lens via the housing's focus/zoom knob when used with Sea&Sea MDX-series and RDX-series housing.

* Zoom is controllable with the focus knob on the housing. (main-body)
* Manual focus cannot be used.