1. Cp Goerz Berlin Serial Numbers

Kodak Ektar 1.9/50; 3.5/50; 3.3/35; 3.5/90; 3.8/105; 4.5/135 (for Kodak Ektra) All cover (some barely) 24x36mm. Come in a variety of designs (even a nice triplet at 3.5/90) and their quality varies from lousy (1.9/50 esp. Wide open) to superb 3.5/50, 3.3/35. Well, the Anastigmat was a separate line of lenses - essentially Tessars with the exception of the 6.3/105, 6.3/130 and 7.7/8in. Some notable Anastigmats were: 7.7/8in Covers 5x7 'process' lens, well-corrected for close-up work. Quite nice 5 1/2in, 6 3/8in, 7 1/2in, 8 1/2in, 10in and 12in - all f/4.5 Cover from 3 1/4 x 4 /1/4 to 8x10 (with movements) depending on the focal length.

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That means one can use only one cell placed behind the iris. In that case the combined foci is multiplied by 1,73, but as a trade off there is a significant loss in luminosity. Most of the above information I researched on 'A history of the photographic lens' by Rudolf Kingslake, Academic Press Inc. ISBN 0-12-408640-3. It is an excellent source for understanding the genealogy of most of the lenses ever produced and the problems associated to lens construction.

But note in the picture below that the serial number is the same engraved on the barrel and on the cells. So f6,8 or 1:6,8 is the lager aperture for this lens. The following figures, even in this Goerz scale, are very close to the regular series of f stops.

Goerz Berlin Lens Serial Numbers downloads at Ebookinga.com - Download free pdf files,ebooks and documents - C. Goerz Optics - Binocular & Cine Collectors. But note in the picture below that the serial number is the same engraved on the barrel and on the cells. So f6,8 or 1:6,8 is the lager aperture for this lens. The following figures, even in this Goerz scale, are very close to the regular series of f stops.

It was interesting to get a picture on a digital camera. For mount it on DSLR camera I glued to the barrel extension ring M42, adding another large and small ring.

The final optical bench test was given by Otto Plankshaft who deemed it above average and gave it his stamp before it was sent to the shipping department. Otto had just been given the news that he was the proud father of twins and he was allowed to leave work early.

I'm a large format b&w photographer with a great interest in classic lenses, of which I have a number, in addition to some modern lenses. My first, and one of my oldest, lenses, is a CP Goerz Berlin Series III f/6.8, 8 inch 'Goerz Double Anastigmatic' (Dagor) in a compound shutter (which believe it or not works well!) From reading Kingslake and Vade Mecum, I know that because it says 'Goerz Double Anastigmatic' instead of 'Dagor', it is prior to 1904, when they began to use the name 'Dagor' (apparently to differentiate themselves from the other double anastigmatics.) But as a matter of pure curiosity, I'd love to know the exact year. The serial number is 140390. Does anyone know of a site or other source which provides a cross reference between Goerz/Dagor serial numbers and year of manufacture? Right now I know that it is between 1892 and 1904.

Goerz from 1890. It was based in Berlin-Friedenau. In 1888 Goerz employed the engineer Carl Moser (1858-1892) and the optician Karl Hertel to start the development of lenses.

Go to: It has more than 700 pages with thousands of lenses description, pictures and diagrams. This Dagor, is from 1911. 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 1910/20. Also some parts of rollerblind shutters and lens elements, that I could not identify, were in the pack. The origin was Santos, a harbor city, 60 Km from Sao Paulo.

They are both extremely sharp lenses. Artars in shutters are rather more expensive than in barrels. My 19' in barrel cost $225 but that was a rather low price for it. Coverage is limited to about 47 degrees at f/22. This works out to an image circle of 210mm for your 9.5' lens. This will just cover 5x7 with no movements so it will allow moderate though not extreme movements on 4x5. Unlike most modern lenses, the illuminated circle is larger than the sharp image circle, so you need to take some care that you don't exceed the coverage of the lens accidentally.

These are both from the 1913 Goerz catalog. The three above from the 1940 catalog The next picture is a zoom into Felipe s left eye. You can compare with the whole picture made in a 4x5 negative by clicking the thumbnail below. The film was Tri-X shot as 320 ASA, aperture was equivalent to f16, developed 8 minutes in at 23 Celsius.

These figures indicating aperture are not the familiar series we are used to see in 35 mm cameras. Goerz used a special scale. In the chart below we can see the equivalents to the system using 4 - 5.6 - 8 - 11 - 16 - 22 - 32 - 45. The 4,5 (that is not in the chart) means 6.8.

Most of the above information I researched on 'A history of the photographic lens' by Rudolf Kingslake, Academic Press Inc. ISBN 0-12-408640-3. It is an excellent source for understanding the genealogy of most of the lenses ever produced and the problems associated to lens construction. If you want something online: download the 'A Lens Collector Vade Mecum' it is only 15,99 USD and an invaluable source of information. Go to: It has more than 700 pages with thousands of lenses description, pictures and diagrams. This Dagor, is from 1911.

From the illustrations in the catalogs the golden dagor was of the 'gold dot' configuration by 1963 but is still referred to in the catalog as the 'GOLDEN DAGOR' right up to and including the 1971 spec. Gold Rim and Gold Dot are apparently only useful descriptive terms to describe the appearance of these lenses but may only represent an evolution in trim much like a chrome bbl vs a black bbl convertible Symmar. Goerz did not use these terms in their sales literature! Goerz was bought out first by Kollmorgen in 1971 and listed a Pittsburgh address, and was subsequently bought by Schneider in 1972(?).

Just fighting with very oxidized brass barrels! I just reported what has been posted, on this forum, by Paul Fitzgerald. He owns a few Dogmars (see his post on this same thread), and confirms that the two cells, IF used alone, show a marked softness. All that in perfect accordance with what's written in the Vademecum, and with the personal experience of all those who tried to use dialyte anastigmats (4E/4G) as single cells, behind the diaphragm. It is common knowledge that the single cells are corrected for astigmatism, but aren't well corrected for zonal spherical aberration (and perhaps even show a little chromatic aberration).

Right now I know that it is between 1892 and 1904. Thanks, Paul.

The design was invented in 1893 by the German mathematician Emil Von Hoegh. Later lens calculations were purchased by Goerz firm, and Emil Von Hoegh was asked to job a leading specialist. Such design is not accidental. Photos of that time wanted to have a versatile lens for portraits, as well as for landscape photography. Dagor actually one of the first anastigmatic, commercially available. The first lens-anastigmatic is Protar, designed by Carl Zeiss, but it did not get such a success as Dagor. For lenses that time Dagor well-corrected coma, distortion, a chromatic and spherical aberration.

Goerz Dagor C.P. Goerz Berlin Dopp-Anastigmaat Serie III Dagor. This is one of the most celebrated lens design ever. More than one hundred years after its introduction it is still a very usable lens.

I got my 300mm (early example, in barrel) not long ago, and i am going to make a couple DIY lensboard to try it as soon as possible on 5x7' and 8x10'. I am very curious to see the results with the two cells alone (wide open and closed one or two stops). With the two cells, at 300mm, i will also see how it compares with Heliars.

Manufok-Tenax scanned by () C. Goerz was founded in 1886 by Carl Paul Goerz (1854-1923), a salesman who once had been in apprenticeship at in Rathenow and later was partner of in Paris. Originally Goerz sold mathematical tools for schools, but from 1887 he added cameras. By taking over F. Hintze's workshop in 1888 his company started to make cameras, and was named Optische Anstalt C.

But if you want to check a serious experience that definitely prove it, go to: You will see a Dagor 19 inches there, and the result one can still reach with a lens from 1905.

Cp Goerz Berlin Serial Numbers

Only four years old, Goerz was producing a Rapid Rectilinear lens called Lynkeioskop, one of the best RR versions. That was the beginning of a huge success. By 1895 some 30.000 had been already sold. The name Dagor was adopted only in 1904 and the design was licensed to almost every lens maker ever since. It is a convertible lens.

For 6x9 Eastman Ektar 6.3/8 1/2in; 6.3/10in; 6.3/12in; 6.3/14in 4 elements in 3 groups, these lenses cover 5x7 to 8x10in. The 14 inch covers also 11x14 at f/16 and below, but without much room for movements. *** Great, fully corrected lenses (coated!) Expensive, big and still very useful even today. All have a great circle of coverage and a very 'sweet', 'full bodied' shadow detail. The minimum f stop is f/45, whereas I'd prefer f/64 or even smaller for 8x10.

By 1895 some 30.000 had been already sold. The name Dagor was adopted only in 1904 and the design was licensed to almost every lens maker ever since. It is a convertible lens. That means one can use only one cell placed behind the iris. In that case the combined foci is multiplied by 1,73, but as a trade off there is a significant loss in luminosity.

In the chart below we can see the equivalents to the system using 4 - 5.6 - 8 - 11 - 16 - 22 - 32 - 45. The 4,5 (that is not in the chart) means 6.8.

Goerz Berlin - 6x Helinox Trieder Binocle Type: German Binoculars.

Please carefully review photos. The binocolers work, and there doesn't appear to be any significant scratching on the lese. This is a great example overall. The leather case these usually come with is NOT included. If you have questions, or would like additional photography, please contact us through Ebay. ” MPN: 548967 Model: C.P.

'Paul I know this thread is a little old but I just picked up a 420 dogmar myself and mine is also missing the aperture mechanism, small world, anyway I was wondering if you ever found replacement parts or created something that would work, thanks.' Actually I have 3, the other 2 work well. The easiest 'fix' would be to remove the outer ring and fit waterhouse stops or washer stops.

These are both from the 1913 Goerz catalog. The three above from the 1940 catalog The next picture is a zoom into Felipe s left eye. You can compare with the whole picture made in a 4x5 negative by clicking the thumbnail below. The film was Tri-X shot as 320 ASA, aperture was equivalent to f16, developed 8 minutes in at 23 Celsius. It gives an idea of Dagors capability in rendering fine details.

The cure is a carful cleaning. Ektars Ektar was used by Kodak as a trade name for its premium lenses. There were a number of generic designs used for them. Ektars were all very high quality lenses. The ones made for press and view cameras were mostly Tessar types. Exceptions are the Wide Field Ektars, which are four element air-spaced lenses of the 'Double Gause' type, and the 203mm f/7.7 Ektar which is a four-element air-spaced Dialye type, made slightly non-symetrical to improve its correction for distant objects. All of these lenses are completely corrected for lateral color and were intended for color photography.

The lens was finally completed on September 23rd at 3.47pm 1903. The final optical bench test was given by Otto Plankshaft who deemed it above average and gave it his stamp before it was sent to the shipping department. Otto had just been given the news that he was the proud father of twins and he was allowed to leave work early. Some anecdotal evidence does mention that Emil von Hoegh slapped him on the back and called him the true 'double' anastigmat and his nickname from that day was 'doppeldaddy'. The lens was then sent via steamer to New York where it was coupled up to a shutter about thirty years later. The lens has seen action in both world wars and was used as both a portrait lens and as a landscape lens used for battlefront recon. A shellburst close by did some damage(during WW1) to the front ring that was replaced at the factory free of charge since the owner in the US was an expat with some connections in the food distribution services for the British troops.

It was in 1982 that a mathematician Emil von Hoegh, 27 years old, proposed to Zeiss this double anastigmat consisting of two triplets symmetrically arranged around the f stop. Zeiss was not interested, maybe because two years earlier they had launched their own anastigmat. So Emil took it to the also very young firm Goerz in Berlin. Only four years old, Goerz was producing a Rapid Rectilinear lens called Lynkeioskop, one of the best RR versions. That was the beginning of a huge success.

Both my Dagors are very old and both have the advertised coverage, but I have no good way to measure the quality of the image at the limit of coverage. On Dagor performance Here is some data from bench testing a lens, 'Goerz Dagor Focus 7in. This lens was produced sometime between 1918 and 1927 (thanks, Mike Buchmeir). If this old lens is representative of others from that time, here is some advice: the spacing is critical, and also, the orientation of one cell relative to the other. (Turning one cell a full turn changes the off-axis resolution by a factor of two and back again. It seems that the optical-centering-error reputation is deserved.) This Dagor shows very little difference in focal length (perhaps.2 mm) wide open compared to the small apertures. Vignetting for 5x7 looks like about a stop's worth at f/16.

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Thanks, Paul. The lens was finally completed on September 23rd at 3.47pm 1903. The final optical bench test was given by Otto Plankshaft who deemed it above average and gave it his stamp before it was sent to the shipping department. Otto had just been given the news that he was the proud father of twins and he was allowed to leave work early. Some anecdotal evidence does mention that Emil von Hoegh slapped him on the back and called him the true 'double' anastigmat and his nickname from that day was 'doppeldaddy'. The lens was then sent via steamer to New York where it was coupled up to a shutter about thirty years later.

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The circle of illumination of a Dagor or similar lens is about as large with the lens wide open as it is stopped down but the sharpness of the periphery of the image isn't very good, this area gets lots sharper as you stop down. To contrast, 'dialyte' lenses, like Artars and Dogmars are pretty sharp to the edges of the image wide open and the coverage (which is limited) doesn't get larger as the lens is stopped down. Triplets and Tessars are midway between these. Generally, older wide angle designs ( and the Dagor really is a wide angle lens) perform best at rather small stops. Its considered good optical design practice to vignette the illumination circle of a lens bewond the point of good performance, (see _Modern Lens Design_ by Warren Smith or Kingslake's design books), so thhis _may_ account for smaller coverage angle in some late versions of old lenses but you would have to derermine is by actual measurement.

99', and underneath this is 'P. When Goerz made this model, it was offered to officers of the Prussian Army at a special discounted price of 95 German Marks. In return the paying officer could assign a unique serial number to the binocular, thus the P. Stood for 'Private Number'.

In 1926, the German branch of Goerz was merged with Contessa-Nettel, ICA and Ernemann to form a new company known as Zeiss-Ikon by the year 1927. Zeiss was the controlling share-holder of the new company and declared that lens production would only be carried out by Zeiss, thus the coffin-lid was finely screwed down on their old adversary of Goerz.

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 1910/20. Also some parts of rollerblind shutters and lens elements, that I could not identify, were in the pack. The origin was Santos, a harbor city, 60 Km from Sao Paulo.