Polyplast

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Dr. Staeble's Polyplast-Satz was a lens kit for folding cameras.[1] It allowed to assemble lenses by mounting one back element on the back of a shutter/iris assembly, and a front elements group on the frontside of the same shutter. The back element stayed fixed, the front element group could easily be exchanged by another since it was fixed on a special fast mount.

Links

  • The advertisement above mentions the famous "Belichtungstafel nach Dr. Staeble" which could be ordered from Staeble for 50 Pfg. Here is a link showing an example of that written exposure aid of times before EVs could be measured by everyone with meters:
    Belichtungstafel nach Dr. Staeble at Fotoamateure Teublitz [1]

Notes

  1. Optisches Werk Dr. Staeble & Co. G.M.b.H Muenchen. pp. 32-36: 7.5, 10.5, 12, 13.5, 16.5, 19.5, 22, 26, 32 1912 Catalogue extracts at www.cameraeccentric.com