This original compact design may be partial driven by the military application requirements, one of them is to operated in high temperature environment. The Elcan optical design is a four-element and four-group so no elements were glued together, as high temperature may affect the glue. This may lead them to eliminate glass elements in the back optical group to maintain compactness, which contributed to the smaller image circle due to lack of optical correction. The design of Summicron 50 Rigid, on the other hand, was more "sophisticated" and it has a larger sharp image circle, even larger than the current Summicron 50 (v5) at open f-stop. The Summicron 50 Rigid is my favorite 50, especially for monochrome M bodies.
Jan 27, 2023 at 04:16 PM
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