Please help about some rare brass lens!

[photojournalism]

Our history gets an interesting turn. As we found the Phos Planisigmat (produced period 1899-1915) is the symmetrical double anastigmat like a Dagor. But we know that Zeiss bought the Goerz only in 1926. And we also know that Emil Von Hoegh tried to be employed to Zeiss and had show his Double Anastigmat, but Carl Zeiss didn't give Emil Von Hoegh the work and after that Von Hoegh was employed to Goerz and created his famous Dagor.

----------------"Ken Ruth at Photography at Bald Mountain is an enthusiast concerning Dagors. He told me the following: "This 27 y.o. mathematician (Emil Von Hoegh), went to Zeiss with his new design for a symmetrical double anastigmat. On his way to Jena, he stopped at a fair and won a goose in a raffle. He knocked at the Zeiss door looking for job as a lens designer and offering his lens to be manufactured. They look at this guy with a goose under his arm and obviously the answer was "Thank you very much" So, he went to Goerz in Berlin and was immetiately hired as a chief optical designer. Goerz started producing the lens in 1894 and in
1895 they reached 35.000 units. "-------------


How do you think is it possible that Zeiss and Ginsberg decided to produce the same design lens (by schemes of Von Hoegh) WITHOUT a patent. It was possible in Poland in Russian Empire but not in Germany. If this truth - we have a firs fake production in the world LOL

Special thanks to Bauloff Viktor for information.

Regards, Andrey

[Ole]

The Dagor is not the only cemented 2x 3-element anastigmat. There's also the Collinear (Voigtländer), the Hexanar (O. Simon), the Protar Ser. VI (only Carl Zeiss Jena from 1909 to 1912), the Amatar (Carl Zeiss), the Angulon (Schneider), and a couple of others too. They all have the elements in different orders, with the exception of the Amatar and the Angulon which are in the same order but with different design criteria.

So is it a "fake", a "spinoff", a "derivarive", or a different design?

[photojournalism]

Hm. I don't know about Protar ser. VI (http://www.cameraeccentric.com/html/...iss/zeiss.html). Actually the Phos can be like the Protar ser VI and the fact that Phos has the millimeter marked iris ring says about it also.

[Ole]

Precisely - that's the 1907 catalogue, not 1909. http://www.cameraeccentric.com/html/info/zeiss/p1.html

I've only seen one of those convertible VIa's, and didn't buy it. Its rarity is no great loss (unlike the Amatar).

Zeiss seems to have marked the aperture on the majority of convertible lenses in mm - my Doppel-Amatar is typical. It's not unreasonable that Phos and others did the same.