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You have three choices for excellent wide angle, 8 mm fisheye, 7-14 zoom (114 degrees on the wide end), 9-18 zoom (100 degrees on the wide end). Zen Underwater makes the ZEN WA-100 Pen Dome for the PT-E01 housing which can be used with the 14-42 and 89-18 lenses. I have used the 7-14 with an Athena adapter and the Olympus 170 mm dome port. A port for the 7-14 is being considered by ZEN Underwater and I am sure a port for the 8 mm fisheye will be develpoed by someone.
Image 9-18 at 9 mm with the ZEN WA-100 port.
Phil Rudin