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Kaufmann’s Posographe: An Amazing Exposure Calculator from the 1920s

Calculator Mini

Kaufmann’s Posographe: An Amazing Exposure Calculator from the 1920s.

Kaufmann’s Posographe is an intricate pocket-sized mechanical calculator invented back in the 1920s. Measuring 13x8cm and filled with tiny scribblings, the device allowed photographers to approximate the exposure values they needed by simply sliding around six small pointers.


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1 Comment

  1. Wow, that’s actually quite beautiful!

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