The PTWC-01 is a high-quality 100° wide angle conversion lens that works on many Olympus housings with ports with 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 colour saturation.

This can be attached to the front of a digital camera underwater case using a step-up ring.