![]() The numbers that are engraved on the side of the barrel seem a little different from any that I have seen. I recently purchased a Goerz Series III, No 3 210 mm lens in barrell. Goerz Dogmar f/4.5 - Cin-Set cine camera and projector 1926 by Nesster, on Flickr and found this: Goerz Tenax 1921-24 by Nesster, on Flickr Goerz Rollfilm Tenax, top view by Nesster, on Flickr Goerz Rollfilm Tenax Dogmar 1921-24 by Nesster, on Flickr This camera was introduced in 1921 and Goerz merged into Zeiss Ikon in 1926. The series II was discontinued in the late 1900s the other models with reduced focal length range were produced into the 1930s. ![]() This had an aperture of f9.5, later f9, and lengths of 11 ¼ - 26 ½'. Goerz Lens Serial Numbers Lookupīlack magic disk speed test macbook pro. ![]() Lastly a series III for process work was introduced in 1911. Around 1906 a wide-angle model was introduced with lengths of 3.9 - 9.2'. 1906, was faster at f4.6 with lengths of 4 ⅜ - 14 ⅔'. This was followed by the series II at f8 in lengths 4 - 26 ½'. The original model, series I of 1901, had an aperture of f6.1 and focal length of 4 - 12' when introduced, later increased to 20'. The Holostigmat, designed by Conrady, is a combinable lens sometimes sold in sets providing several focal lengths.
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