Retaining ring with M77.5x24tpi female thread for Aero Ektar

Retaining ring with M77.5x24tpi female thread for Aero Ektar.

Please check your actual lens thread since different Aero Ektars may have bit different threads.

The ring comes useful if you want to mount the lens onto a board for a large format camera.

External diameter is 84mm. Side surface is knurled. 2 notches are made to use a lens wrench if necessary.