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Thread: Mystery Dagor...

  1. #1
    Embdude's Avatar
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    Mystery Dagor...

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    Mystery Dagor...
    Anyone recognize it?
    No external marks to Id it...
    I can say that it is: 12” (300mm) 6.8 Goerz Double Anastigmat type...
    In Koilos shutter...
    On a grey metal lensboard, screwed into a wooden one, screwed into a small box, screwed into a graflex lensboard... the box is probably to allow focus at max graflex bellows...
    Shutter and lens-boards are most likely not original to the lens... in fact the more I look at it it seems maybe it is adapted from an old brass lens...

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  2. #2

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    Re: Mystery Dagor...

    If you take the shade off, is there any writing on the barrel?

  3. #3
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    Re: Mystery Dagor...

    The aluminum top does not come off... it is secured to the brass barrel... with lacquer maybe? both it and the side of the bras barrel are painted black on parts so perhaps something exists below the black paint... I can unscrew the top portion of the barrel and remove the front element, this is how I know it is a Dagor type... 3 cemented elements... Anyway once removed there is no where else for a beauty info ring to be...

  4. #4

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    Re: Mystery Dagor...

    Quote Originally Posted by Embdude View Post
    No external marks to Id it...
    I can say that it is: 12” (300mm) 6.8 Goerz Double Anastigmat type...
    If there are no external marks, how can you say more than that the aperture scale starts at 6.8 (does it?) and that at least one cell is a cemented triplet?

  5. #5
    Tin Can's Avatar
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    Re: Mystery Dagor...

    Tin Can

  6. #6
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    Re: Mystery Dagor...

    Quote Originally Posted by Dan Fromm View Post
    If there are no external marks, how can you say more than that the aperture scale starts at 6.8 (does it?) and that at least one cell is a cemented triplet?
    The Koilos shutter has all the markings for shutter and aperture... 6.8 being the largest. My lens has 2 identical cemented triplet cells. Since the 12in. DAGOR (an acronym for Double Anastigmat Goerz) was a 6.8 and also the originator of this design and by far the most prolific maker of this type (especially in the early brass lens time) it seems the most likely place to start...

    Of course I do not know what it is for sure... That is the best I can deduce so far... I am hoping by sharing it here I may be further enlightened...

    The Koilos shutter is European dates to around 1909 and if original to the lens might indicate a European lens...

  7. #7
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    Re: Mystery Dagor...

    Quote Originally Posted by Randy Moe View Post
    Looks like a very nice lens! A dagor type that dates to around 1920... I'll add it to the list of possibilities...

  8. #8
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    Re: Mystery Dagor...

    And nice for 7X17. I don't have that lens, but of the same production.

    They seem fairly rare.

    Quote Originally Posted by Embdude View Post
    Looks like a very nice lens! A dagor type that dates to around 1920...
    Tin Can

  9. #9

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    Re: Mystery Dagor...

    P-H Pont's chronology says that Koilos shutters with air brakes were made from 1906 - 1910. I asked why you think it is a Dagor because many European makers made 6 elements in two groups double anastigmats in that period. Some had f/6.8 maximum apertures, others were faster, still others slower.

  10. #10

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    Re: Mystery Dagor...

    Quote Originally Posted by Dan Fromm View Post
    P-H Pont's chronology says that Koilos shutters with air brakes were made from 1906 - 1910. I asked why you think it is a Dagor because many European makers made 6 elements in two groups double anastigmats in that period. Some had f/6.8 maximum apertures, others were faster, still others slower.
    Just pointing out that putting lenses into an existing stock of older shutters probably did happen back then. So a 1920s era lens very well could be in a 1910 shutter.

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