Cinema System Gear Set ~for Tokina AT-X 11-20mm F2.8 PRO DXZoom and focus gears allow access to the mechanical zoom focus functions 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 focus gear set is for the Tokina AT X 11 20mm F2. 8 PRO DX with the Nauticam Cinema System. This item is non returnable, non refundable, non cancellable, and may be subject to extended lead times as it is manufactured on demand. We