M40x0.75 male to M52x0.75 male thread adapter

• Front side - M52x0.75 male thread
• Rear side - M40x0.75 male thread
• Machined of high quality aluminium alloy.

This adapter allows reverse mounting lenses with 52mm filter thread on #1 shutters (Compur #1, Copal #1, Copal Press #1, Prontor #1).