This Aquatica Zoom Gear is for using the Tokina 10-17mm lens with the Kenko 1.4x teleconverter in Aquatica housings. The gear attaches to the zoom ring of the lens and is long enough to engage the control gear on the housing. Now it is possible to have control of the lens' zoom function when the Kenko 1.4x teleconverter is attached.
Both the Kenko TelePlus Pro 300 DG 1.4x, or the Kenko TelePlus MC4 AF 1.4x, are compatible. By using the Tokina 10-17mm lens with the Kenko 1.4x teleconverter you will able to capture extreme wide-angle close-up images. When using Aquatica 4" Mini Dome, you will be able to focus even if your subject is sitting right on the dome.