Nauticam SN1224A Z Zoom Gear for Sigma 12-24mm F4 DG HSM Art Lens - Underwater Housing Accessory for Diving & Marine Photography

This is a used item that is in like new condition. 

Zoom gears allow access to the mechanical zoom function of supported lenses. Use of this gear may require the use of additional port extensions or adapters. Check the Port Chart for more details.

This zoom gear is for the Sigma 12-24mm F4 DG HSM | Art lens.