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Thread: Help: infinity focus with 9x12 Unknown beauty

  1. #31

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    Re: Help: infinity focus with 9x12 Unknown beauty

    It looks a pretty capable lens !

    I feel this triplet delivers an amazing bokeh !

  2. #32
    gimenosaiz's Avatar
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    Jan 2015
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    Re: Help: infinity focus with 9x12 Unknown beauty

    Quote Originally Posted by Pere Casals View Post
    It looks a pretty capable lens !

    I feel this triplet delivers an amazing bokeh !
    Hello!

    I think so! I'll shoot some close portraits with a better background to check that bokeh :-)

    Thank you!

  3. #33
    8x10, 5x7, 4x5, et al Leigh's Avatar
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    Re: Help: infitniy focus with 9x12 Unknow beauty

    Quote Originally Posted by gimenosaiz View Post
    I think that I get focus at infinity at around 16 cm!!!! (from the rear of the lens to the film plane).
    Hi Antonio,

    The distance from the rear of the lens to the film is of no significance.
    You may find that number on some specifications, but it's meaningless.

    The focal length of any lens equals the distance from the rear nodal point to the film when focused at infinity. Unfortunately, there's no easy way to determine where that rear nodal point is.

    The number we commonly use is the "flange focal distance", which is the distande from the lensboard to the film when focused at infinity. That's easily measured.

    - Leigh
    If you believe you can, or you believe you can't... you're right.

  4. #34
    Ron (Netherlands)'s Avatar
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    Re: Help: infinity focus with 9x12 Unknown beauty

    Nice pictures, great work.
    Btw you don't need a new ground glass: just take it out and clean it with kitchen abrasive (like VIM) comes in powder and fluids: it will brighten it up again! - clean the frosted side!
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