Sea&Sea DX MACRO PORT 87
This port accommodates listed lenses without additional port-base or extension ring. Port has M67 screw mount.
Dimensions :128x120.5mm / 5.0x4.7inches
Weight :Approx. 505g / 17.8 oz
Depth rating :100m / 330ft
Construction :Corrosion-resistant aluminum alloy (anodized, anti-reflection coating on the inner surface)
Distance :Between the port mount and inner glass surface : 87mm / 3.4 inches