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This picture I used in the booklet to represent the complicated Sonnar and Biogon optical schemes of lenses. All these designs were introduced by ingenious German engineer Ludwig Bertele. Even today these lenses are able to astonish photographers by their performance. It's hard to imagine how Bertele was able to calculate these beautiful classic designs with just the aid of logarithmic tables (no computers in that time!). Fascinating!

From the album:

Kiev: The legend in Your Hands

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