Goerz Lens Serial Numbers

I recently acquired a lens that is labelled: 'GOERZ DAGOR F:6.8 FOCUS 9 1/2 IN. No.222689' Can anyone identify what type of Dagor it might be and when it was produced? I've looked all over the WWW and can only find a 222*** Goerz series that appears far too old for this particular lens. The lens is coated but not multicoated and there is no country of origin marking on the lens it is in an Alphax shutter. It belonged to a photography professor in Rochester and it seems like a pretty nice piece of glass. The shutter would not be the orig.

1. Goerz Lens Serial Numbers
2. Goerz Lens Serial Numbers Doreen

Sanders is right: This lens is far too old for original coating and dates from anywhere between ~1906 and 1910; the shutter is at least 20yrs younger, likely a 1940s model. Re: 'What type of Dagor'?Just the 'normal' one., i.e. , or 'Gold-Dot,'.: This 72 degree Dagor (90 degrees at f 32) was sold as a 6.5x8.5' lens (wide open) which was however supposed to be able to cover 11x14' (!) at f 32.(Goerz 1913 catalogue). So, as a collectors item it ain't worth much, but that doesn't mean it can't be used to take nice pictures, which is also dependent on the shutter re-mount job, as cell spacing was critical with dagors. Thanks Thanks Everyone for your kind responses. I tend to agree with Phitz that this lens is likely from the 1950s and not the earlier part of the century. If B&J used their own serials, this might explain the variance and confusion.

The positive lens can be either a conventional prime lens such as a Tessar or Protar, or a specialist group called the Tele-Positve. Some tubes had iris diaphragms and shutters fitted. This example is a Tele-Negative attachment in a tube with removable focusing mount. The likely positive lens would have been a Tele-Positive of 135 mm focal length. Item Type: Shutter, Lens: Brand: Burke & James, Betax, Goerz Dagor, Gundlach Anastigmat: Model: Compound, No.4, Focus, Series IV: Serial Number: 757131, 119596. “Estimated numbers of serial production of binoculars of Optische Anstalt C.P.GOERZ - Berlin Serial numbers were estimated from the intersection of several data (dates engraved on military binoculars) and bibliographical sources Goerz and other collectors. The start and end range are indicative and cannot be taken with utmost precision, but are. On Goerz Serial numbers and dates. (former Goerz Tech.) Lens # 35 1902-1903 170 1903-1905 267 1906-1908 230 1908-1909 334 1911 -1914. Date of CP Goerz Double Anastigmatic (Dagor) Lens. Antique CP GOERZ Optical KENRO K2 LENS for Large format photography F10 This lens is a Goerz Kenro K2 Dagor. The serial number is 818668. Dagor Lens Information. Notes and threads on Dagor lenses. On Goerz Serial numbers and dates Goerz Amer. Serial #'s from Eddie Bolsetzian. That lens production would only be carried out by Zeiss, thus the coffin-lid was finely screwed down on their old adversary. During its time, Goerz had produced. Wether this number is a serial production run.

The Holmes, Booth & Haydens lens above, is also marked 'Patented June 7th, 1859.' 'The Lens is almost 22' long including the shade. While on the subject of 'diffusion' or 'depth 'of focus it may be remarked that a delusion on this point is cherished by a vast number of photographers. For this the. On Goerz Serial numbers and dates. (former Goerz Tech.) Lens # 35 1902-1903 170 1903-1905 267 1906-1908 230 1908-1909 334 1911 -1914. Date of CP Goerz Double Anastigmatic (Dagor) Lens. Goerz Optics I. Introduction II. In 1942 the Goerz lenses. “Estimated numbers of serial production of binoculars of Optische Anstalt C.P.GOERZ - Berlin Serial. Goerz Optics I. Introduction II. In 1942 the Goerz lenses. “Estimated numbers of serial production of binoculars of Optische Anstalt C.P.GOERZ - Berlin Serial. Based in Berlin, Germany, C. Goerz was a manufacturer of lenses and cameras beginning in 1888. (see here for dating these serial numbers).

This is certainly not a 90 year old lens. Recently, when I had the lens CLA'd they advised that the coating is beginning to degrade slightly. I'm sure this is an after-production coating either from B&J when remarketing or from Goerz. Fbi 4600 Dl Installation Manual. The lens will be used for 8 x 10 black and white mostly and I plan to get to know it well once my bellows returns from Western Bellows. Thanks again.

Click to expand.It's definitely not one of the infamous B&J 'Berlin Dagors'. Those lenses were assembled using old, loose, and often poorly matched, elements of dubious quality. They were sold by B&J as new 'Berlin Dagors' and did not contain the word 'Goerz' anywhere on the lens. If they would have, they would have been sued to high heaven by C.P. Lenses made in Germany prior to the German Goerz being absobed by Zeiss-Ikon (ca.

1926) are labeled: 'C.P. GOERZ BERLIN'. Lenses made in Germany after the Zeiss merger are labeled: 'Carl Zeiss Jena' and 'Goerz-Dagor'.

Lenses made by the American Goerz company were engraved with a number of different designations over the years. The lens shown above is definitely a pre-WWII US made Dagor. The simple 'GOERZ DAGOR' was the engraving style they used at that time.

Later, possibly post-WWII, perhaps a little earlier (I'd have to comb though old catalogs to nail down a date), they switched to labeling their lenses 'C.P. GOERZ AM.OPT.CO'. This designation remained until around 1963 or 1964 when they changed the company name and labeling to read' 'GOERZ OPTICAL CO. And then there were the later Kern made Dagors during the Kollmorgen (early 1970s) and Schneider (1970s and early 1980s) years. Those are easy to tell as they are all labeled 'Lens made in Switzerland'. There may have been other permutations, especially in the very early years of the American Goerz company, but those are the main ones I know of off the top of my head. As I stated above, any Dagors assembled from loose elements by Burke and James are labeled as 'BERLIN DAGOR' absent the word Goerz.

The specific lens pictured in this thread is definitely decades older than the shutter it is presently mounted in. As others have stated, the shutter is not original. It's definitely a remount. Also, the date of manufacture of the lens pre-dates commercially viable coating technology by many years. So, if it is coated (it doesn't look like it is in the attached photo, but it's impossible to tell for sure form a small jpeg image), it was coated years later - possibly at the same time the lens was mounted in the shutter.

If it was retrocoated, the coating (and shutter mounting for that matter) may have been done by B&J. It may have been done by C.P. Goerz AM Optical, or maybe someone else. I have seen genuine Goerz lenses that were retrocoated by B&J.

I've even seen one in a box that contained a little slip of paper stating that it had been coated by Burke and James. Although coating reduces flare and increases contrast, uncoated Dagors are perfectly usable. The Dagor is a cemented design. So, it only has four air:glass interfaces (compared to an Artar or WF Ektar that have eight air:glass interfaces and benefit much more from coating). Click to expand.Ian, Thanks for the info. That date, right around the beginning if WWII seems about right for when the American Goerz started labeling things 'C.P. Stood for American.

The original C.P. Download Detective Conan Movie 13 The Raven Chaser Sub Indonesia here. Goerz was obviously a German company, and Goerz is a very German sounding name. So, here in the states, at that particular time in history, it would have been very wise from a marketing standpoint to make sure your potential customers knew you were an American company and proud of it. I also have what appears to be a pre WWII GoerZ Am. Optical Dagor, that is coated.

Goerz Lens Serial Numbers

The inscription on mine reads Goerz Dagor, F:6.8, Focus 12 in., No. Mine is in an early Acme shutter. Any idea when this lens was made? There is a big gap in the listed Goerz serial numbers between 320000 (1918) and 751240 (1927). And if Burke & James were coating older Goerz Dagors.

How would they have done the actual coating? Coated the existing cells as they were, or de-cemented the cells, coated the outside elements and re-cemented the three elements in each cell?

C.P. Goerz

Berlin

Germany

Model VIIb, 75 mm

Lens Type:

Telephoto attachment. Variable separation.

For 3 - 8x magnification. Rack and pinion adjustment.

Serial Number:

186905 .

This was made in two versions for either hand or bellows cameras. The tube and elements could be purchased separately. Advertisements in the 1905 BJA list the VIIb as taking a primary lens with a different flange diameter to the example shown here. The 3' negative lens is also not listed as for use with the VIIb tube. A 3' negative suited a prime lens of 6', 7' or 8 ¼' focal length covering a 4' x 5' plate at low magnification and 12' x 16' at high magnification.

Goerz Lens Serial Numbers Doreen

Carl Zeiss

Jena

Germany

45 mm

Lens Type:

Telephoto attachment. Fixed separation.

Helical focusing scaled to 6'. For quarter-plate.

Serial Number:

55260 .

The Zeiss Tele Objective consists of negative attachments, positive lenses and tubes which can be combined in various ways. The positive lens can be either a conventional prime lens such as a Tessar or Protar, or a specialist group called the Tele-Positve. Some tubes had iris diaphragms and shutters fitted. This example is a Tele-Negative attachment in a tube with removable focusing mount. The likely positive lens would have been a Tele-Positive of 135 mm focal length.

Voigtländer & Sohn

Braunschweig

Germany

97 mm

Lens Type:

Telephoto attachment. Fixed separation.

For 15 cm primary lens. 2.5x Magnification. For 10 x 15 cm.

Serial Number:

103244 .

With:

Box.

This is a conventional telephoto attachment consisting of a negative lens for mounting behind a normal objective. The attachment is for use with hand cameras such as the Voigtländer Alpin. It fits inside the bellows and screws to the rear of the lens panel. It was made in two sizes for quarter-plate (12 or 13.5 cm objectives) and 5 ½' x 3 ½' (15 cm objectives).