The film was Tri-X shot as 320 ASA, aperture was equivalent to f16, developed 8 minutes in 510 Pyro at 23 Celsius. You can compare with the whole picture made in a 4x5 negative by clicking the thumbnail below. The three above from the 1940 catalog The next picture is a zoom into Felipe s left eye. If you want an explanation of what problem the Anastigmats solved, go to my page about the Ross Protar VIIa Some contemporaneous ads from the other side of the Atlantic.Īdversing in Photominiature April 1899 Adversing in Photominiature December 1909 Adversing in Photominiature Feb 1900 The following reproductions from Goerz catalogs, and a lot more from other lenscamera makers, you can find at Camera Eccentric website. The following figures, even in this Goerz scale, are very close to the regular series of f stops. In the lens ring it is marked 1:6,8 but as the scale shows it as 4,5 I started to wonder if the cells would have been mounted in a barrel afterwards.īut note in the picture below that the serial number is the same engraved on the barrel and on the cells. The 4,5 (that is not in the chart) means 6.8. These figures indicating aperture are not the familiar series we are used to see in 35 mm cameras. I tried to trace it back, tried to know to whom in belonged, but the seller, having an antique shop there, could not remember how it all arrived to his hands. I bought it in a shoe box together with a Voigtlander Orthoscop from 1858, a Tessar also from 1911 and a Rodenstock Rapid Aplanat 2 from 191020.Īlso some parts of rollerblind shutters and lens elements, that I could not identify, were in the pack. Go to: Lens Vade Mecum It has more than 700 pages with thousands of lenses description, pictures and diagrams.
If you want something online: download the A Lens Collector Vade Mecum it is only 15,99 USD and an invaluable source of information. It is an excellent source for understanding the genealogy of most of the lenses ever produced and the problems associated to lens construction. Most of the above information I researched on A history of the photographic lens by Rudolf Kingslake, Academic Press Inc.
In that case the combined foci is multiplied by 1,73, but as a trade off there is a significant loss in luminosity. The name Dagor was adopted only in 1904 and the design was licensed to almost every lens maker ever since. Only four years old, Goerz was producing a Rapid Rectilinear lens called Lynkeioskop, one of the best RR versions.
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