The Rodenstock 32.5mm Lens Adapter is used with their enlarging lenses with 32.5mm screw threading, and allows them to use the #260020 Rodenstock Modular-Focus Mount. The #260020 Focus Mount allows you to mount the enlarging lens upon your view camera, and use it as a taking lens. Though these lenses have an aperture provision, there is no control from the lens of the shutter speed.