Nauticam Zoom Gear for Sigma 8-16mm f/4.5-5.6 DC HSM Canon

Nauticam Zoom Gear for Sigma 8-16mm f/4.5-5.6 DC HSM Canon

The zoom gear use on following port:
a) use with extension ring 20 and 8.5' fisheye port
b) use with extension ring 60 and 6' dome port
c) use with extension ring 20 and 8.5' white balance port

Dimension: 102 mm x 79 mm x 11 mm
Weight: 77g / 6g
Construction: Anodized aluminum alloy & Nylon