ALPA supplies all lenses made by Schneider-Kreuznach from 80 mm to 250 mm focal length besides the standard version also in a special "Short Barrel" version that is 34 mm shorter than the standard version. It is possible to have an existing standard lens changed into "Short Barrel" lens. In order to use the infinity setting on such a lens, the taken out 34 mm have to be restored by an adapter between the camera body and the digital or rollfilm back. Why the effort?
- Shortening the lensboards ("barrels") in the "Short Barrel" lenses by 34 mm permits the use of the interchangeable 0°-6° ALPA tilt/swing adapter. The limitation to focal lengths of 80 mm and longer allows for the construction of a solid tilt/swing mechanism while enabling the employ of the most important medium and long focal lengths for this purpose.
- The "Short Barrel" lenses also allow the better use of given image circles.
- Even with long focal length lenses it becomes possible to utilize the full 6x9 format without any cropping.
- Long focal length lenses can provide the desirable optimal unity of digital or rollfilm back, camera body and lens, both as regards distribution of weight and of aesthetics.
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