The Olympus PTMC-01 is a high quality macro lens that works on older Olympus or other manufacturers' housings that have a 67mm port thread. The lens has a magnification of 2x, and is a very high quality optic.

The lens allows you to get close to small subjects. This will improve your underwater photos by increasing contrast and color saturation.

This is a very high quality optic, better than the Fantasea 3x.