AquaTech Sigma Zoom Gear for 18-35mm f/1.8 Art Lens

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AquaTech Sigma Zoom Gear for 18-35mm f/1.8 Art Lens Enjoy smooth, seamless lens operation underwater when using AquaTech's 10985 SGZ 18-35mm Zoom Gear for the Sigma ART 18-35mm f/1.8 Lens. Mount the gear on the zoom ring of your lens, then connect it to the zoom control knob of your AquaTech Delphin or Elite Sport Housing. When you're ready to shoot, you'll be able to zoom the lens back and forth from outside the housing. Key Features: Smooth Underwater Zoom Operation Compatible with AquaTech Ho