For mirrorless interchangeable camera housings. The port has an M67 screw mount on the front.
[Dimensions (DIAxD)] 93 x 59mm / 3.7 x 2.3 inches
[Weight] 220g / 7.8 oz
[Depth rating] 100m / 330ft
[Construction] corrosion-resistant aluminum alloy (anodized), tempered glass (multi-coated)
[Distance] Between the port mount and the inner glass surface : 33mm / 1.3 inches