The Rodenstock 90mm f/5.6 HR Digaron-W Lens is a lens specifically designed for use with digital backs, which require a smaller image circle with extreme resolution, color correction, and maximum performance at a large aperture. This lens is recommended for use with backs as large as a 72 x 96mm maximum image area, and with a 40 x 54mm back it will provide a view similar to that of a 58mm lens in 35mm format.
In many cases, digital photography is superior to conventional photography if the desired end product is a printed image. To achieve this ideal, however, a much higher demand is made upon the image reproduction quality of the lens. This is because of a digital image chip's smaller area, which means finer details in a scene are squeezed into a smaller image recording area, as well as their sensitivity to color fringes.
But Rodenstock's digitally-specific lenses such as this HR Digaron-W provide image quality which allows the maximum capacity of a digital back to be realized. The lens utilizes every technological possibility to
get as close as possible to the absolute limits of diffraction-
determined resolution, even accounting for the properties and thickness of a CCD's protective glass. With the HR Digaron-W, you can use digital backs with a pixel pitch as small as 5µ.
Because this lens is designed for a view camera without an optical concession to clear a camera's mirror box (such as in an SLR camera's lens), this lens is commonly adapted to be used with DSLR cameras because of its remarkable resolution.
This version of the 70mmm HR Digaron-W is equipped with the Rollei #0 Electronic Shutter, with speeds from 1/500th to 30 seconds and aperture control in 1/10th f-stop fractions. Aperture and shutter speed is controlled via a Rollei Lens Control (not included).