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Thread: Why does the ground glass lack four corners?

  1. #1

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    view grid ground glass

    why the view Grid Ground Glass lack 4 corners ?

  2. #2

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    Why does the ground glass lack four corners?

    why the view Grid Ground Glass lack 4 corners ?

  3. #3

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    Re: lack 4 corner

    The ground glass lacks four corners for two reasons:
    One is to prevent the bellows from expanding or collapsing when focusing. Some cameras have tight tolerances, almost air-tight.
    The other reason is so that you can check for vignetting. When set up to take the photo, if you can see the complete aperture through all four corners, the will be no mechanical vignetting. This is useful when using filters, lens hoods, etc.
    I hope this helps.

  4. #4
    Tin Can's Avatar
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    Re: view grid ground glass

    Not all do. Some like cut corners for at least 2 reasons

    We can use a corner to see the aperture and they allow less dust with bellows vacuum
    Images vastly preferred

    not game trying to


    focus


    In Time

  5. #5
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    Re: Why does the ground glass lack four corners?

    Threads merged.

    qinghua: Please don't start start threads with the same question in more than one subforum... thanks.

  6. #6
    Tin Can's Avatar
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    Re: view grid ground glass

    'this this' I do that all the time
    Images vastly preferred

    not game trying to


    focus


    In Time

  7. #7

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    Re: Why does the ground glass lack four corners?

    I would think they cut them to avoid the weakest point of the glass. A bump or pressure on the corner is the best way to crack glass. Also less sharp points during production, transport and repair.
    Expert in non-working solutions.

  8. #8
    Tin Can's Avatar
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    Re: view grid ground glass

    Some GG Frames have raised corners not allowing GG with square corners

    Most seem deliberately designed and manufactured with that 'not' a flaw

    Look at a few
    Images vastly preferred

    not game trying to


    focus


    In Time

  9. #9

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    Re: Why does the ground glass lack four corners?

    because large format is so tedious, they need to cut corners anywhere they can.


  10. #10

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    Re: Why does the ground glass lack four corners?

    I'd prefer square corners...but I do like to be able to check coverage when using "extreme" movements.

    As for the other issue...that of air compression/suction exploding/imploding one's bellows (ouch!) - there is another very easy solution, without cutting (ground glass) corners. Simply cut some air relief channels in the underside of your ground glass frame - on the film insertion side. Obviously easier with wood...but in designing my L-45A camera, I incorporated this feature so that I could preserve the squared screen corners.

    Of course, my next move is to insert some accordion reeds into these channels - would make the act of focussing a musical event!

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