Olympus POSR-EP06 Anti-Reflexion Ring for M.ZUIKO ED 12-40

Olympus POSR-EP06 UW Shading Ring

The POSR-EP06 Anti-Reflecting Ring for PT-EP11 underwater housing. This device blocks the writing, such as aperture and focal length, etc, on the front element of your lens from being reflected in the glass of your housing's lens port.

This will prevent the writing from showing up in your underwater photos and Videos.