This Ikelite Zoom Sleeve is used to access the zoom function on the Nikkor 18-105mm VR lens. This is the outer plastic ring that has gear teeth that mesh with the gear on the housing.
Lens clamp 9059.9 is needed in order to attach this sleeve to the lens. This lens clamp is included with most Ikelite DSLR housings.
Zoom Sleeve for Nikkor 18-105mm VR Lens