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The Aquatica Focus/ Zoom Gear for 60mm f/2.8/ 85mm f/3.5 Macro/ 16-35mm f/4 WA is a versatile camera lens accessory that can act as either a focus or a zoom gear, depending upon the lens with which it is paired. In macro / close-up photography, use it as a focus gear for the Nikon AF-S Micro NIKKOR 60mm f/2.8G ED Macro Autofocus lens or the Nikon AF-S DX Micro NIKKOR 85mm f/3.5G ED VR Macro Autofocus lens with macro port #18426 (port required but not included). For wide-angle shooting, the device can be used as a zoom gear for the Nikon AF-S NIKKOR 16-35mm f/4G ED VR Wide Angle Zoom lens.
As a focus gear, the device mounts on the focus ring of the lens and connects to the underwater camera housing port's focus control knob. You manually rotate the focus control knob to focus the lens in and out. As a zoom gear, the device mounts on the zoom ring of the lens and connects to the housing's zoom control knob. You manually rotate the zoom knob to move the zoom back and forth.