The Zen Underwater WA-100 Pen Dome for Olympus PT-EP01 Housings address the problems with their new WA-100 dome port for PT-EPxx housings. This optically coated glass dome port offers a distortion free 100° wide angle field of view when used with the Olympus M.Zuiko Digital ED 9-18mm f/4-f/5.6 lens. This is a 25% increase in FOV over the standard Olympus flat port and retains the in-air field of view of the Olympus M.ZUIKO DIGITAL ED 9-18mm f/4-f/5.6 lens and M.ZUIKO DIGITAL ED 14-42mm f/3.5-f/5.6L lenses.