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Thread: Are all Goerz Double Anastigmats Dagors?

  1. #1

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    Are all Goerz Double Anastigmats Dagors?

    Some people think so. See http://web.archive.org/web/201701301...-/381940550573

    I looked up the patent. The lens offered is a dialyte type. The VM says that the Goerz Type B double anastigmat's trade name is Celor.

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  2. #2

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    Re: Are all Goerz Double Anastigmats Dagors?

    He doesn't actually say it is a Dagor - just quotes an intersearch which mentions the series iii and series iv which are normal dagors and wide-angled dagors. He is faithful in giving the actual rim engraving.

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    Re: Are all Goerz Double Anastigmats Dagors?

    Quote Originally Posted by Steven Tribe View Post
    He doesn't actually say it is a Dagor - just quotes an intersearch which mentions the series iii and series iv which are normal dagors and wide-angled dagors. He is faithful in giving the actual rim engraving.
    He strongly hinted that it is a Dagor. If you'd read the listing to the bottom you'd have seen:

    ----- Some info I found on the web:

    Goerz Double Anastigmat was designed by von Höegh and introduced in 1892, from 1904 it was known as the Dagor. It proved very successful and was widely copied. The series III is a general purpose lens working at f6.8 in the shorter lengths and f7.7 in longer lengths. Available in sizes of 1 ⅝ - 35" (in the UK in 1900). The series IV was a modified design for copying and architectural use, working at f11 it was introduced in sizes up to 47".
    A wink's as good as a nod.

  4. #4

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    Re: Are all Goerz Double Anastigmats Dagors?

    The Dagor is certainly a Dagor type, but Celor and Syntor are 4/4 DA, as the later Dogmar!

    The very first DAGORs "Doppel Anastigmat GOeRz" were only called Doppelanastigmat Goerz...

    The Series III DA is a Dagor!

  5. #5

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    Re: Are all Goerz Double Anastigmats Dagors?

    My Goerz catalog under "Goerz-Double-Anastigmat" lists:
    Dagor, Celor, Syntor, Alethar, and Hypergone. The Celor is in Series Ib/c/d. The Dagor is in Series III and IV, Syntor is Series Id, Alethar is Series V, and Hypergone is Series X. And then there is a bunch of other non-DA types like Lynkéioscope etc.

  6. #6
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    Re: Are all Goerz Double Anastigmats Dagors?

    Quote Originally Posted by pkrpkr View Post
    My Goerz catalog under "Goerz-Double-Anastigmat" lists:
    Dagor, Celor, Syntor, Alethar, and Hypergone. The Celor is in Series Ib/c/d. The Dagor is in Series III and IV, Syntor is Series Id, Alethar is Series V, and Hypergone is Series X. And then there is a bunch of other non-DA types like Lynkéioscope etc.
    The Hypergon is a symmetrical two-element design. I don't see how it could be corrected for astigmatism.
    "I love my Verito lens, but I always have to sharpen everything in Photoshop..."

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    Re: Are all Goerz Double Anastigmats Dagors?

    Quote Originally Posted by Mark Sawyer View Post
    The Hypergon is a symmetrical two-element design. I don't see how it could be corrected for astigmatism.
    More to the point, I don't see how a single Hypergon cell can be an anastigmat.

  8. #8
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    Re: Are all Goerz Double Anastigmats Dagors?

    Quote Originally Posted by Dan Fromm View Post
    More to the point, I don't see how a single Hypergon cell can be an anastigmat.
    Quite true. And yet they're engraved "Doppel Anastigmat". I don't see how a simple meniscus can be corrected for astigmatism...
    Attached Thumbnails Attached Thumbnails hypergon.jpg  
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  9. #9

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    Re: Are all Goerz Double Anastigmats Dagors?

    Click image for larger version. 

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    Re: Are all Goerz Double Anastigmats Dagors?

    Yeah, I've seen that. Marketing fluff until proved otherwise.

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