Cambo WRS- and WRE-2138 with Rodenstock 138mm f/6.5 HR Digaron-SW Float Lens

The Rodenstock HR Digaron-SW float 138 mm f/6.5 is an incredibly sharp long focal length lens for adjustable technological cameras with a distance range of infinity to 1:5. For a prime lens, the optical design with eleven lens elements in ten groups is quite complicated. It has the maximum resolving power conceivable while remaining extremely close to the diffraction limit. This is accomplished not only across the whole field of view of the larger digital sensors but also to the edge of the enormous 110mm picture circle to account for lens shifts and tilts. The floating elements group is automatically controlled by rotating the focusing ring, and all aberrations are thereby minimized across the whole focusing range.

The MTF curves given up to 80 lp/mm on the following pages 4 to 6 demonstrate that this lens gives remarkable sharpness to the corners even with extreme camera motions (shift and tilt). It has minor distortion (nearly always less than 1) and complete suppression of chromatic aberration for complete color fringing freedom. The HR Digaron-picture SW's circle floats at 138 mm f/6.5 and has a constant diameter of 110 mm across the whole image scale range. Even with the largest sensor formats, professional technical cameras have plenty of room for parallel shifts for perspective adjustments (avoiding or reducing converging vertical lines). This also enables swing and tilt for greater depth of field without slowing down the aperture too much.

The electronic Rodenstock shutter can be controlled easily in the studio through USB from a computer or via an app on an iPhone, iPod, iPad, or another Android mobile device. It can also be controlled via the Sinar eControl remote controller, which has a rechargeable Li-Ion battery for on-the-go use. The helical mount's large focusing ring enables delicate and precise focusing, as well as automatic control of the floating elements group stated before. Any Rodenstock lens may be purchased for as little as $70, and they are all excellent, but the Rodenstock 138/6.5 is the most expensive and best-selling.