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The WRA-2138 Float Lenspanel is dedicated to the use with Digital Backs with sensor activated electronic shutter and has a Rodenstock 6,5/138 HR-Float Digaron lens with Aperture Only mounted in a helical focussing mount, which also drives a floating element for optimal sharpness at any focussed distance. The WRA-2138 fits to all Cambo Wide cameras with SLW-adapters.The Rodenstock HR Digaron-SW float 138 mm f/6.5 is an exceptional sharp long focal length lens for adjustable technical cameras intended for a wide distance range from infinity up to an image scale 1:5.The optical design with eleven lens elements in ten groups is very complex for a prime lens. It has the highest possible resolving power extremely close to the diffraction limit. This is not only achieved across the entire field of the largest digital sensors - but also to the edge of the large 110mm image circle to allow for lens shifts and tilts. The rotation of the focusing ring automatically controls the floating elements group and all aberrations are therefore minimized throughout the whole focusing range.Even with extreme camera movements (shift and tilt) this lens provides an unprecedented sharpness to the corners as proven by the MTF curves given up to 80 lp/mm on the following pages 4 to 6. It provides negligible distortion (almost always below 1 ) and a total suppression of the chromatic aberration for perfect freedom from color fringing.The image circle of the HR Digaron-SW float 138 mm f/6.5 has a constant diameter of 110 mm throughout its entire image scale range. For professional technical cameras, even with the largest sensor formats, this gives ample clearance for parallel shifts for perspective corrections (avoiding or reducing converging vertical lines). This also allows swing and tilt for extended depth of field without excessive stopping down of the aperture according to the Scheimpflug rule.In the studio the electronic Rodenstock eShutter can be controlled easily via USB from the computer or with an app from an iPhone, iPod, iPad or a similar Android mobile device. It can also be operated with the remote controller Sinar eControl with a rechargeable Li-Ion battery offering independent use on location.The broad focusing ring of the helical mount allows sensitive and precise focusing and automatically controls the adjustment of the floating elements group mentioned above.Optical MovementsCCD size 37x37mm: 33/33 mmCCD size 33x44mm: 34/30 mmCCD size 36x48mm: 30/26 mmCCD size 37x49mm: 31/27 mmCCD size 40x54mm: 28/24 mmCCD size 36x56mm: 29/24 mmCamera MovementsWDS: Up / Down / Left / Right: 34 / 26 / 20 / 20mmWRS: Up / Down / Left / Right: 25 / 15 / 20 / 20mm