The Rodenstock 23mm f/5.6 HR Digaron-S Lens with Copal Shutter & Lensboard from Arca Swiss is optimized for digital imaging sensors and chips. It comes with a purely mechanical Copal shutter and lensboard. Also, the lens produces a 70 mm image circle for formats up to 33 x 44 mm in size. This allows for large movements without a decrease in image quality.
The lens is designed for use with medium and smaller format digital sensors, which are sensitive to diffraction and low-light conditions. This is done by optimizing the working aperture to between f/5.6-8, minimizing diffraction while still letting in a moderate amount of light. Additionally, this lens has been specially corrected to nearly eliminate distortion, chromatic aberrations, and curvature of field.
The Copal shutter is a mechanical shutter requiring manual cocking. It is X-synchronized and can reach a shutter speed of 1/500 second as well as bulb and timed modes. The lens also includes a lensboard for mounting to a view camera.