Nauticam M67 flip diopter holder for 36137This great new diopter holder from Nauticam turns Nauticam's 36137 port into a flip adapter. This way you can easily flip a macro diopter onto the front of your port. Secure design, machined aluminum adapter Clip lock keeps the lens from flipping out while you are shooting Spring tension keeps the lens from flipping back in front of your port when you are not using it.