Sigma 105mm F2.8 EX DG OS HSM Macro Lens Focus Gear - SN105 F Compatible with DSLR Cameras for Professional Macro Photography, Product Shooting & Close-Up Portraits

Focus gears allow access to the mechanical zoom function of many lenses. Use of these gears may require specific port extensions and may not be available for all housings and lenses.

This focus gear is specific for the Sigma 105mm F2.8 EX DG OS HSM Macro (Nikon Mount) lens.