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This Olympus port extension along with dome port PPO-E04 (not included) is needed when the Zuiko 7-14mm zoom lens is used on the Evolt E-300 digital camera in the PT-E01 housing.
This lens is ideal for underwater photography since it has an angle of view of 110 to 70° and will focus as close as 3.5" (9cm). This allows you to get closer to your subject producing photos with better color, contrast and detail.