Apo-Sironar digital / Apo-Macro-Sironar digital
This lens series provides even larger image circles increasing with the focal lengths. From a 105 mm image circle for 35 mm focal length, 125 mm for 45mm and 105 mm focal length and 150 mm for 135 mm to 180 mm focal length. These lenses provide large image circles for use with digital scan backs as well as with chip backs having larger area sensors or being used in the macro-scan mode for larger formats by stitching multiple shots made with laterally shifted back from one shot to the next. Of course also ultimate quality analog images are possible when applying roll film backs. Therefore these lenses are the first choice for photographers who use both analog and digital photography. Focal lengths from 35 mm mean that real wide-angle shots are possible, even with the smaller area sensor sizes, while still allowing large movements. For filling the gap between 55 mm and 105 mm we offer the HR Digaron-W lenses 70 mm and 90 mm with an image circle of 100 mm and 125 mm respectively.
Due to the small formats on the one hand (which are sensitive to higher diffraction!) and the high illumination requirements of the CCD image sensor on the other, digital photography does not allow the lenses to be stopped down as much as in conventional large-format photography. For this reason, these lenses have been optimized for a working aperture of f/8 to f/11.
Because both the surface of the area sensors and the area scanned by CCD line sensors have better planarity than conventional roll films and sheet films, special attention was given to the correction of the curvature of field. The freedom from distortion, which is so important for product and building photography, and the uniformity of illumination are also excellent.
With the Apo-Macro-Sironar digital we provide a special macro lens at the same superb performance level as that of the Rodenstock Apo-Sironar digital series for high-resolution digital photos at reproduction scales from 1 : 5 to 2 : 1.