Web Pricing - Why are the prices on this web site different from those in your stores?
Our stores are staffed with a wide variety of product specialists and support staff, each of whom make an effort to be responsive and pleasant to deal with. We're also able to provide a customer with any item from our inventory to inspect and test. The cost of this customer service is an increased overhead for our in-store prices, to pay for the store space, the training of our employees, and other considerations not present online. We're happy to offer reduced prices online and hope that you will be satisfied with your purchase no matter where you decide to buy.
The Aquatica 16.5 mm Port Extension Ring for Aquatica Bayonet Style Housings is especially designed for the Canon EF 17-40mm f/4 zoom lens. It is equipped with a knob on its side that connects to the lens focus ring via a gear. This knob has a retractable mechanism that makes installing and removing the lenses a quick and simple operation. Just rotate the release disk to lift the internal pinion gear out of the way.
While Autofocus has always been recognized as a useful tool when shooting still photography, it is not always so when shooting video, in most DSLR Cameras the autofocus performance when used in the video mode is unacceptably slow and most users would prefer to shoot video with access to manual control for critical focusing, a basic and sometime essential requirement for quality video footage. This new extension ring integrates a knob for manual focus and its dimension has been optimized for our acclaimed 9.25” Megadome, this BK-7 coated mineral glass dome port is the ultimate in optical quality.
The all aluminum construction benefitted from our latest technology improvements and of state of the art 5 axis machining, this is how we managed to keep its weight to a minimum without compromising the 300ft/90m depth rating associated with all our products.
To check lens and lens port compatibility, see the following charts:
Price, images, specifications and descriptions of items are subject to change without notice. We are not responsible for typographical or photographical errors. Rebates & conditions, and expiration dates from manufacturers are subject to their authorization.