Restores the original view angle of a lens: Most of underwater housings come with a flat port and when using the camera underwater with a flat port it loses around 28% of a view angle. By attaching this accessory to underwater housing - it restores the original view angle of a lens, just like on the surface.
Applied to any underwater housings that have 67mm thread at the port
High quality world class standard. Manufactory certificated: ISO9001 and CES and IPx8