Ewa-Marine 77-82mm Lens Step-Up Ring

This 77-82mm Lens Step-Up Ring from Ewa-Marine adapts lenses with 77mm filter thread diameters for use with 82mm conversion lenses, filters, or adapters. One such type of adapter is the one that fixes the front element of the lens to the interior of the port on Ewa-Marine underwater camera housings, in order to hold the lens securely in place. You can screw this ring onto other rings to stack them and use accessories with different filter thread sizes as well. The step-up ring is included with select Ewa-Marine housings, so you may use this one as a spare or replacement for the original.