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Enhance your view when shooting underwater with this Aquatica Zoom Gear for the Sigma 17-70 f/2.8-4.5 DC Macro HSM & OS HSM version lenses. Mount the gear on your lens's zoom ring, and then connect it to the zoom control knob of the underwater housing compatible with your camera. Once beneath the waves, you'll be able to zoom the lens back and forth from outside the housing.