Nauticam SN1835f1.8-Z Zoom Gear ~for Sigma 18-35mm F1.8 DC HSM | A
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 18-35mm F1.8 DC HSM | A (Nikon mount) lens.