The biggest drawback to the PT-EPxx housing is the standard flat port included with the housing. Wide angle lenses behind flat ports (such as the stock flat port supplied with PT-EPxx) exhibit refractive magnification, radial distortion, and chromatic aberration.
Zen Underwater addresses these 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.
In a radical departure from prior Olympus M4/3 camera housings, Olympus changed the port mount for the PT-EP08 housing, implementing a rotating bayonet style latch, and eliminating the upgrade path for owners of prior PT-series housings fitted with Zen Underwater ports.
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