The Olympus PTWC-01 is a high quality 100° wide angle conversion lens that works on many of the Olympus housings with ports that have a 67mm thread. The lens has a magnification of 0.6x. The large size of the lens blocks the camera's built-in flash so an external flash must be used.
The lens allows you to get closer to large subjects. This will improve your underwater photos by increasing contrast and color saturation.
Olympus PTWC-01 100 Degree Underwater Wide Angle Conversion Lens with 67mm Thread - Rated up to 131'