ewa-marine CA adapter set
ewa-marine, made in Germany since 1947 

ewa-marine CA adapter-system

- avoids reflexions or other optical disturbances

order code: see below under "different versions"


The patented CA system was invented and developed by ewa-marine to allow the lens of a camera to be fixed to the front port of a housing or rain cape. It ensures that the surface of the lens and that of the housings front port are permanently parallel to each other, thus ensureing that there are no reflections or other optical disturbances between these two glass surfaces. Due to the CA system, the front port has the same effect as a clear glass filter would have in every day photography.


The CA system is composed of a filter-ring and a fixing-ring
For video housings we generally supply the appropriate ring for the most popular camcorders. Due to the enormous range of camcorders and the fact that some manufacturers chose obscure, new filter threads for every new modle, you might have to purchase an additional reduction adapter to fit the CA system to the filter thread of your camcorder. These reduction adapters are available from every well stocked photo dealer.
A tip for users of Panasonic camcorders and their generics: In some cases it would seem, that the camcorder does not have a filter thread! This is not true. For design reasons the manufacturer has fitted the camcorder with a dummy that is screwed into the thread. Turn and unscrew this lens surround (normally chromed plastic) to gain access to the filter thread.
The SLR-housings of the U-F.. range are sold with one fixing-ring and the following selection of filter-rings:

49, 52, 55, 58 and 62mm

Filter rings for the sizes 67mm and 72mm are available as an option and can be ordered through your dealer.

If you have an autofocus SLR with an internally focusing lens (please note, only fully internally focusing lenses!), you can also purchase a CAF system for your housings to replace the AV100 or AV110 for easier assembly.

Screw the filter-ring onto the lens of the camera or camcorder.
Then take the fixing-ring into both hands and clip it into the grove of the filter-ring as seen in the sketch above.
The camera can now be put into the housing and then fixed to the front port by gently pushing the port over the lens.

Special Adapter for 82mm filter threads

For filter thread of 82mm we offer custom made aluminium adapter. This screw on to the filter thread and fix the lens with our front port.

Order codes:

CA-Set CA set for filter threads of 49, 52, 55, 58, 62 mm diameter

CA-49 CA rings for a filter thread, diameter: 49 mm

CA-52 CA rings for a filter thread, diameter: 52 mm

CA-55 CA rings for a filter thread, diameter: 55 mm

CA-58 CA rings for a filter thread, diameter: 58 mm

CA-62 CA rings for a filter thread, diameter: 62 mm

CA-67 CA rings for a filter thread, diameter: 67 mm

CA-72 CA rings for a filter thread, diameter: 72 mm

CA-77 CA rings for a filter thread, diameter: 77 mm*

*(until September 2017 no longer available, please use CA-82 and step-up ring RA77-82)

CA-82 CA rings for a filter thread, diameter: 82 mm