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The Zoom Gear for Tokina AT-X 10-17mm + 1.4x Converter Lens from Aquatica mounts on the zoom ring of the Tokina AT-X 10-17mm f/3.5-4.5 AF DX Fisheye + 1.4x Converter lens and enables zoom control when the lens is inside a port. It connects to a compatible underwater housing's zoom control knob. Manually rotate the zoom control knob to move the zoom back and forth while shooting.
For lens port and housing compatibility, see Type 4 Lens Chart