TN1017-Z Zoom Gear ~for Tokina AT-X 10-17mm F3.5-4.5 Fisheye DXZoom 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 Tokina AT X 107 AF DX Fisheye AF 10 17mm f 3. 5 4. 5 (Nikon mount) lens. This item is non returnable, non refundable, non cancellable, and may be subject to extended lead times as it is manufactured on demand. We always do our best