This lens is a small format version of the widely used and long-established lens type invented by Paul Rudolph in 1918, especially common in large-format photography. It provides high correction of aberrations with usually a moderate maximum aperture. It is a specific instance of the Dagor type double-meniscus anastigmat, but improves on it by adding flexibility for placement of the meniscus lens, allowing for placement away from the first two elements and removing the criterion of symmetry..The lens incorporates a variable SA ring. By moving the front lens group just one millimeter, you can select your preferred sharpness from position 6 to 2. Enabling this was simple, but in regard to improving astigmatism, due to the peculiarities of this lens' design, the Petzval value could only be decreased from 0.6 to 0.4. That being said, by using the variable spherical aberration control to change the lens spacing, the best astigmatic position P6, and best coma aberration position P4 can be selected.
Initial lot of lenses, designed, manufactured and hand-assembled in Japan by Mr Sadayasu Miyazaki.
Please note that we cannot make reservations for serial numbers.
Includes lens, lens hood and caps.
Vario-Petz 57/2 Notes (Vario-Petz_57:2_Notes.pdf, 394 Kb) [Download]