Olympus POSR-EP09 Anti-Reflexion Ring for M.ZUIKO 25mm

Olympus POSR-EP09 UW Shading Ring

The POSR-EP09 Anti-Reflecting Ring for the M.Zuiko 25mm f1.8 lens. 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.