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RODENSTOCK HR Digaron W f4.0 40mm Copal 0

Call Direct Digital Imaging today to order your RODENSTOCK HR Digaron W f4 40mm Copal 0 on:-

HR Digaron-W

The pixel size of the sensors of digital camera backs cannot be reduced just as one likes for achieving higher resolution with- out a significant increase of image noise and a reduction of exposure latitude. This is the reason why larger sensors with a resolution up to about 60 megapixels have been developed for professional digital backs. However, digital lenses with image circle diameters of about 70 mm designed for smaller sensors do not allow sufficient or even any camera movements. This is why the new Rodenstock lens series HR Digaron-W with larger image circles from 90 mm on and with an extremely high reso- lution very close to the physical limit of diffraction has been developed. This new lens series comprises the focal lengths of 40 mm, 50 mm, 70 mm and 90 mm. The last mentioned two lenses are the renamed former Apo-Sironar digital 70 mm f/5.6 and Apo-Sironar digital 90 mm f/5.6 which both had al- ready been calculated according to the much higher demands on freedom from aberrations for higher resolution with larger working apertures (reduced stopping down).The shorter focal length of wide-angle lenses causes larger light incident angles at the margin of the image. This results in some blur because of astigmatism, spherical aberration and color fringes produced by the protection glass of a thickness of approx. 2 mm in front of the light-sensitive sensor plane. This can be visible with high resolution sensors. Therefore, the optical effects of this glass plate have been taken into consid- eration for the calculation of the lenses HR Digaron-W 40 mm f/4, 50 mm f/4 and 70 mm f/5.6.A remarkable feature of the HR Digaron-W 40 mm f/4 (with a focal length equivalent to 26.5 mm for 5 mm format) is the long back focal length of approx. 25 mm. It leaves free space for shift and tilt movements between the rear mount and the sensor to avoid touching it or the rear standard. A flange focal length of approx. 70 mm allows focusing at infinity with a flat lens board and permits the use of the Rollei Electronic shutter.