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. 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. But note in the picture below that the serial number is the same engraved on the barrel and on the cells.

Carl Paul Goerz began in business in Berlin in 1886, and formed the Opticsche Anstalt C.P. Goerz Optical Institute) in 1890. The firm began making Galilean binoculars in 1891 and prism binoculars in 1896. Nov 09, 2005  Date of CP Goerz Double Anastigmatic (Dagor) Lens. My first, and one of my oldest, lenses, is a CP Goerz Berlin. Search Google Groups for 'Goerz serial numbers'. German Binoculars C.P. Goerz Berlin - 6x Helinox Trieder Binocle. On the left is stamped 6 x 30 drp marinetreapla and on right has goerz berlin. The item has original brown leather hard case. The lens is clear; the left front lens has one small stressed spot. eBay!

In 1888 Goerz employed the engineer Carl Moser (1858-1892) and the optician Karl Hertel to start the development of lenses.

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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. My records after 1950 are a bit sketchy but I hope that helps!

Unknown Royal Navy official photographer IWM n.pub. German official photographer Royal Air Force official photographer BBC British official photographer Brooks, Ernest (Lieutenant) Ministry of Information Photo Division Photographer Press Agency photographer Royal Naval Photographer Wood, Conrad Brooke, John Warwick (Lieutenant) War Office official photographer Royal Flying Corps official photographer No. 5 Army Film & Photographic Unit HMSO Coote, R G G (Lt) WAR OFFICE War Office Royal Air Force Beadell, S J (Lt) Army Film and Photographic Unit Varges, Ariel No. 2 Army Film & Photographic Unit British Army official photographer McLellan, David (Second Lieutenant) Tomlin, H W (Lt) Ministry of Defence Themes. British Private Papers Original documents political history Destroyer politics foreign relations political history, general Port bow view Starboard bow view foreign policy Starboard broadside view Miscellaneous Documents Photocopies Polish Port broadside view verse poetry Memorial for the Fallen poems by individual authors army training in general training, army Frigate Starboard quarter view british army, infantry regiments, regiments of the line Women's War Work british political history literature Port quarter view Cruiser Licensing.

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.

They are famous lenses. The C.P.Goerz-American Optical Co. Was originally the U.S. Division of the German Goerz company which was important before the first world war. After the war the German parent was restricted in what it could make (by the German government) and in about 1926 was absorbed into the Zeiss-Ikon combine.

An item that has been used previously. See the seller’s listing for full details and description of any imperfections. Seller Notes: “ 100% genuine antique example with signs of wear throughout the piece.

Also, can anyone post performance data of any modern lenses-- to show us what the improvements in resolution and coverage have been?

The name Dagor was not used yet. It was referred as Double Anastigmat Goerz. If you want an explanation of what problem the Anastigmats solved, go to my page about the Some contemporaneous ads from the other side of the Atlantic. Adversing 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 lens/camera makers, you can find at website.

Ektars are also among the earliest lenses to be cemented with thermo-setting synthetic adhesives rather than the traditional Canada Balsam. Generally, an Ektar in good condition will have excellent performance even by current standards. Kodak quality control after about 1938, when Rudolph Kingslake took over the optical department, was excellent. Kodak lenses from about this date on can be dated by the two letters preceding the serial number.

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.

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

The corrections of 'dialyte' lenses like the Artar do not change much with distance. While it is optimized for 1:1 (the later 'Red Dot' series was not) it will perform very well at infinity. The lens begins to get a little coma in the corners but stopping down a bit will cure this.

'I have a 420 also, and it has had rave reviews from any print I have presented.' Acura is the 'better BMW', Dogmar is the 'better Heliar'. Sorry but I do have quite a few of each. Acura is the 'better BMW', Dogmar is the 'better Heliar'. Sorry but I do have quite a few of each.

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.

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.

It won't be very soon, though. The back is made for 10x15cm glass plates, so i am trying to adapt a 5x7' sliding back to the camera, and in the meantime i am working at all the small repair jobs that must be done. Maybe i could find a way to test the lens before i'm done with that project.

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. 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.

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.

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

I have no 300mm Heliar, but i have two other focals, both uncoated: a 360mm even older than the Dogmar, and a pre-WWII 210mm on Compound. All of them are f/4.5, so it would be a fair fight:) have fun CJ. The best way to make a soft focus lens out of one of these it to give it a light tap with a hammer - one of my Eurynars has a cracked front element, and it is very pleasingly soft. My wooden and rubber hammers got a lot of use/abuse in the last days.:) I didn't knock on the glasses, though. 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.

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.

In the year 1899, Goerz produced a prismatic binocular, which he offered to the German Ministry for testing. This proved successful, for early in the year 1900 an order was placed by the German Ministry and full scale production was started of the model known as '1899'. Zeiss was already using a well established D.F. Code system for their Ministry binoculars, so Goerz kept the system and stamped the binocular 'D.F.99' The D.F., stood for 'Doppelfernrohr' (Double-Telescope), and this can be traced back to binoculars that Zeiss were producing in the year 1874.

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. 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.

More than one hundred years after its introduction it is still a very usable lens. 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.

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. 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.

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.

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.

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).

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. Fine lenses (great for architecture, as they don't display much linear distortions of any kind.) There were also Anastigmats for small format cameras (35mm, Bantams and Vigilants) Well after WWII, Kodak started tinkering with their lenses a lot, and the distinctions between many lens lines blur in the 50s.