The Rodenstock 40mm f/4.0 HR Digaron-W/SW 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 a lensboard Also, the lens produces a 90 mm image circle for formats up to 40 x 54 mm in size. This allows for large movements without a decrease in image quality.
The lens is designed for use with high resolution digital sensors, which are sensitive to diffraction and low-light conditions. This is done by optimizing the working aperture of 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 and curvature of field.
The Copal shutter allows for stepless shutter control and mechanical operation with X-synchronization. Also, the included lensboard allows for mounting of the lens to a view camera.