The Porthole features a machined, textured outer barrel and silicone band for extra grip, and a recessed lens to protect the acrylic from scratches when set face-down.
Inner diameter of the housing is approximately 4" and supports a wide range of lens sizes. The housing length is 7" overall, and the barrel depth is 6-3/8" to the inside of the acrylic lens. This allows compatibility with external-focus/zoom lenses and large macro lenses.
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