Leitz APO-Summicron R 2/180 lens is one of the best tele-lens that I've ever experienced. Digital format is regarded as a precise lens performance test device. Leitz company once designed the lenses according to the principle, "The KANTE theory". That is the special design to achieve the tree dimensional edge sharpness, in the designing some aberrations were permitted if necessary to the purpose. Japanes factory were seeking the best answer only on the planes, on two dimensions. Even 50 years ago the target were different between them.
Now digital format proves the validity of the "KANTE Theory".
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