Nauticam SN1770OS-Z for Sigma 17-70mm F2.8-4DC Macro OS HSM
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Housing - Gears
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 17-70mm F2.8-4DC Macro OS HSM (Nikon mount) lens.