for Sea&Sea DX/NX/S120 or Nauticam N120 port mount.
Compact port size for Canon EF 100mm f/2.8L Macro IS USM lens.
Lightweight: It is made from the special high-class plastic PBI, the strongest intensity in plastics.
Can attach the M67 threaded close-up wet lenses on the flat port.
Flat port included M67(67mm) thread for close-up wet lenses.