Use this Sea & Sea Zoom Gear to control manual zooming with your Sigma 17-70mm f/2.8-4 DC MACRO OS HSM lens in a compatible lens port, which mounts onto an MDX underwater housing for a Canon or Nikon camera. It is only compatible with the redesigned version of the lens, which was introduced in 2013 and has a "C" label on the barrel. Manual focus cannot be used when this zoom gear is in place. The gear mounts onto the zoom ring of the lens and is controlled via the focus/zoom dial/knob on the housing. It is constructed from a corrosion-resistant aluminum alloy.
UPC: 752221311693