- Front side - M39x1 female thread
- Rear side - M40x0.75 male thread
- Machined of high quality aluminium alloy.
This adapter allows using lenses with M39x1 (LTM) male thread mount on #1 shutters (Compur #1, Copal #1, Copal Press #1, Prontor #1).
The female thread is made shallow (3.5mm only) to let lenses with short thread get as close to the sensor as possible.