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The Aquatica 4" Glass Dome Port for Sony SEL16F28 16mm f/2.8 Pancake Lens is designed to protect your lens when you use it underwater with a Sony NEX camera in an Aquatica AN series housing. Featuring a glass port composed of BK7 mineral, it's treated with a broad band anti-reflective coating (BBAR) on the inside to reduce internal reflection and a harder silicone oxide coating on the outside that helps protect the surface from scratches.
When a 30600 Extension Ring (not included) is inserted between the dome port and the housing, the lens and port can be used with the Sony VCL-ECF1 fisheye conversion lens.