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  1. #1
    romunas's Avatar
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    working distance Bronica SQ-Ai

    Does anybody knows flange focal distance of Bronica SQ-Ai? I need to know it for producing monocle for my one.
    Last edited by romunas; 10-25-2010 at 09:15 AM. Click to view previous post history.

  2. #2
    Jon Shiu's Avatar
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    I am not sure what you mean, but there is a mark on the side near where the dark slide goes in. It looks like a 0 with a line through it. I believe it marks the focal plane.

    Jon
    Mendocino Coast Black and White Photography: www.jonshiu.com

  3. #3
    romunas's Avatar
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    Thank you for answering. But i asked something different. Sorry for my English i'm not very familiar with English

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    You can measure the distance from that mark to the front of the lens mount yourself, and from a quick google, it should be around 101mm. Info from here

    http://www.graphics.cornell.edu/~wes...habetical.html

  5. #5
    Jon Shiu's Avatar
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    Not sure why you couldn't measure it yourself with the info I provided?

    Jon

    ps not sure what is meant by a monocle?
    Mendocino Coast Black and White Photography: www.jonshiu.com

  6. #6
    Keith H's Avatar
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    Quote Originally Posted by Jon Shiu View Post
    .............ps not sure what is meant by a monocle?
    Good question Jon, and one I was about to ask.
    Regards.

    Keith Hudson

    My film set on flickr http://www.flickr.com/photos/zx9/set...7603300220450/

  7. #7
    MattKing's Avatar
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    Could it be a reference to an eyepiece correction lens - a "diopter"?

    This would make sense if by "working distance" romunas meant "effective viewing distance".
    Matt

    “Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”

    Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2

  8. #8
    DWThomas's Avatar
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    Hmm - on the SQ series, the chrome ring the lens seats against measures approximately 85 mm from the film plane. With the slight extension of my body cap pinhole adapter, I get a pinhole to film distance of about 90 mm.

    But I suspect this may not be the answer to the intended question -- maybe the question is a reference to "eye relief"? Unfortunately, I'm not aware of the answer to that. There are a half dozen different viewfinders, so it might help to know which one, if that has anything to do with the question.

    Maybe a quick sketch could bridge the language gap?

  9. #9

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    I guess the idea is to convert the lens to spotting scope, something like http://www.bdimitrov.de/kmp/lenses/a.../monocular.jpg .
    From http://www.bdimitrov.de/kmp/lenses/index.html#adapters : "The monocular converter K converts K mount lenses to monoculars. It provides magnification equal to that of a lens with five-times the focal length. For example, a 50mm lens appears to be 250mm and a 300mm lens appears to be 1500 mm."

  10. #10
    romunas's Avatar
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    Quote Originally Posted by Bob-D659 View Post
    You can measure the distance from that mark to the front of the lens mount yourself, and from a quick google, it should be around 101mm. Info from here

    http://www.graphics.cornell.edu/~wes...habetical.html
    101 mm is the distance for Bronica s2a not SQ.
    My friend found another site: http://www.geocities.co.jp/Hollywood/1089/mounts.html

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