Rodenstock HR Digaron 40mm scene cast calibration examples with Hasselblad CFV50c on the Linhof Techno November 4, 2014 Cameras Lenses Tweet Tags: Lens Tests Scene cast calibration test with a Rodenstock HR Digaron 40mm on a Linhof Techno with the CFV-50c Digital Back.click images for closer detail. Rodenstock 40 HR with no shift 10mm rise after calibration 10mm rise before calibration 15mm rise before calibration 15mm Rise After Calibration 20mm Rise before Calibration 20mm Rise after Calibration