• Front side - 34.6mm bore
• Rear side - Olympus OM male bayonet mount

Machined from high quality aluminium alloy.

This adapter allows using #0 shutters (Compur, Copal, Copal Press,  Prontor) on Olympus cameras with OM mount.

You need a retaining ring to mount the shutter.

The adapter has no lock/release mechanism that can be found on OM lenses. This simplification allows keeping low enough price. Don't worry about security - springs in the camera mount hold the adapter strong enough to prevent unintentional unmounting.