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  1. #11

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    Goerz 168mm Dagor Sample Images?

    I just picked up one of these at a local antique shop and was wondering if anyone has any sample images? There's quite a bit of info on them including that they cover 8x10s, I'd like to see what they do before sticking film through a camera.

  2. #12
    David A. Goldfarb's Avatar
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    Comparison shots with 3 other lenses on 6x17cm (vignetting on the 168mm shot is due to the mechanical obstruction of the 6x17 extension back, not the coverage of the lens)--

    http://www.apug.org/forums/viewpost.php?p=98112

    I've used it on 8x10", but I don't know if I have anything conveniently scanned at the moment.

    Threads merged.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  3. #13

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    illumiwhatsit, David, are you sure that a 168/6.8 Dagor will cover 8x10? Cover as in put good image in the corners, not cover as in put light in the corners.

    I have two reasons for asking. The first is a long and hilarious thread on the LF forum -- here's the link http://www.largeformatphotography.in...ht=lousy+dagor -- about whether a 7"/6.8 Dagor will cover 8x10. The second is calculations my friend Eric Beltrando, who's written a ray-tracing program and uses it to evaluate old lens designs, did on several generations of Boyer Beryl prescriptions. The Beryl is a Dagor clone, the Beryl prescription's in the parts of Boyer's archives that Eric has are uncannily close to prescriptions for Dagors in Goerz' patents. Eric has told me that Beryls are good for 70 degrees (not the 84 or so needed for a 168 to just cover 8x10) for non-critical work and for only 50 degrees for critical work.

    Cheers,

    Dan

  4. #14

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    @Dan Frommwhatsit - I don't really care whether it covers 8x10, primarily because I don't currently have an 8x10 to test it on. I was just wanting to know whether someone had digitized examples of what the lens looks like.

    Ps. Sorry if my screen name confuses you.

  5. #15
    David A. Goldfarb's Avatar
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    Quote Originally Posted by Dan Fromm View Post
    illumiwhatsit, David, are you sure that a 168/6.8 Dagor will cover 8x10? Cover as in put good image in the corners, not cover as in put light in the corners.
    For something critical, like a commercial architectural image that's going to be enlarged for a glossy poster, it might be marginal in the corners, and I don't see myself using an ancient uncoated lens for that anyway, but stopped down, the older 168/6.8 ser. iii, or at least the one that I have, is good enough with a few mm to spare for the 8x10's that I'm likely to make with it--namely landscapes and architecturals that I'm planning to contact print. Since it's such a compact lens, I also like it for 4x5" when I need lots of image circle.

    According to Goerz's own catalogue, at f:32 a 6" Dagor should cover whole plate, and a 7" should cover 8x10", and 168mm would be somewhere in between.

    Sometimes, all one needs is to put light in the corners, as long as there isn't any important detail there, and as long as the image isn't terribly distorted, like, say, at the edge of the image circle with an Angulon where the image quality drops off quite radically.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

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