Sea&Sea Extension ring for mirrorless interchangeable lens cameras (equipped with port lock).
Specifications
Dimensions (DIAxD): 97 x 36mm / 3.8 x 1.4 inches
Weight: Approx. 111g / 3.9 oz
Depth rating: 100m / 330ft
Construction: Corrosion-resistant aluminum alloy (alumite coating)
Distance: Between the mount and the front end: 25mm / 1.0 inches