Ikelite SLR Zoom Sleeve For SIGMA 8-16mm f/4.5-5.6 DC HSM Lens

The Ikelite SLR Zoom Sleeve For SIGMA 8-16mm F4.5-5.6 DC HSM Lens works with the Black Housing Gear to enable you to operate the zoom on your SIGMA 8-16mm F4.5-5.6 DC HSM lens while it is installed in the Ikelite housing. It fits over the lens and has teeth that align with those of the housing gear. The sleeve goes onto the lens before installation of the modular 8" (20.3 cm) or standard 6" (15.2 cm) dome port (not included). The sleeve is operated via the housing's zoom control knob.