Cp Goerz Berlin Serial Numbers
- Does anyone have a list of C.P. Goerz Berlin serial numbers? I have searched the net, but only found the numbers from the american branch. I got a Dogmar 6,3/135mm (S/N 353458) today, and according to the Vademecum it was only produced for a short time.
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In 1895 Goerz founded a branch in New York that started its own production in 1902 and was to become the C. Goerz American Optical Co. In 1905 (see here for dating these serial numbers). This company continued to operate independently in the US until 1972. Until WWI many great companies cooperated with Goerz.
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Goerz Dagor C.P. Goerz Bremen Dopp-Anastigmaat Serie III Dagor. This is certainly one of the nearly all celebrated zoom lens design actually. More than one hundred decades after its introduction it is definitely nevertheless a quite usable lens. It has been in 1982 that a mathematician Emil von Hoegh, 27 years old, proposed to Zeiss this double anastigmat containing of two triplets symmetrically arranged around the f halt. Zeiss had been not interested, probably because two yrs previously they had launched their own anastigmat. Therefore Emil had taken it to the also very younger firm Goerz in Berlin.
Just four years older, Goerz was making a Fast Rectilinear lens known as Lynkeioskop, one of the best RR variations. That was the beginning of a large achievement. By 1895 some 30.000 had been already sold.
The name Dagor had been adopted only in 1904 and the style was certified to almost every lens maker ever since. It is usually a convertible lens. That means one can make use of just one cell placed behind the iris.
In that case the combined foci is usually increased by 1,73, but as a industry off there can be a substantial reduction in luminosity. Most of the over information I researched on 'A background of the final zoom lens' by Rudolf Kingslake, Academic Push Inc. ISBN 0-12-408640-3. It will be an great supply for knowing the genealogy of most of the lenses ever produced and the difficulties linked to zoom lens building. If you want something on the internet: download the 'A new Lens Extractor Vade Mecum' it can be only 15,99 USD and an crucial resource of details.
Proceed to: It has more than 700 webpages with thousands of lenses description, photos and diagrams. This Dagor, is from 1911. I purchased it in a shoe box together with a Voigtlander Orthoscop from 1858, a Tessar also from 1911 and a Rodenstock Quick Aplanat #2 from 1910/20.
Also some parts of rollerblind window shutters and zoom lens elements, that I could not really identify, had been in the group. The beginning has been Santos, a have city, 60 Km from Sao Paulo. I tried to track it back, attempted to understand to whom in belonged, but the vendor, getting an antique shop there, could not remember how it all arrived to his hands. These numbers indicating aperture are not really the familiar series we are usually utilized to see in 35 mm surveillance cameras. Goerz used a unique scale. In the graph below we can see the equivalents to the program making use of 4 - 5.6 - 8 - 11 - 16 - 22 - 32 - 45.
The 4,5 (that is not really in the graph) indicates 6.8. In the zoom lens band it will be ski slopes 1:6,8 but as the size shows it as 4,5 I began to question if the tissue would possess been installed in a barrel soon after. But note in the picture below that the serial amount is usually the same engraved on the clip or barrel and on the tissues.
Cp Goerz Berlin Serial Numbers
Therefore f6,8 or 1:6,8 is the lager aperture for this lens. The following figures, also in this Goerz size, are really close to the normal series of n halts. The following 3 pictures are usually from the Photograph Membership de Paris publication in 1899. The title Dagor had been not utilized however. It has been referred as Double Anastigmat Goerz. If you would like an description of what issue the Anastigmats solved, move to my page about the Some contemporaneous ads from the other part of the Atlantic.
Adversing in Photominiature April 1899 Adversing in Photominiature December 1909 Adversing in Photominiature Feb 1900 The adhering to will not be from Goerz catalogs, and a lot more from additional zoom lens/camera makers, you can discover at site. Excellent online supply.
These are both from the 1913 Goerz listing. The three over from the 1940 listing The next picture is certainly a move into Felipe s left eyesight. You can evaluate with the entire picture produced in a 4x5 adverse by clicking on the thumbnail below. The film has been Tri-X shot as 320 ASA, aperture has been comparative to y16, developed 8 moments in at 23 Celsius. It gives an concept of Dagors capability in making fine details. But if you would like to check out a significant encounter that definitely demonstrate it, move to: You will observe a Dagor 19 ins there, and the result one can still reach with a lens from 1905.