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  1. #1
    Pfiltz's Avatar
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    Why is ground glass

    ground? Probably a really easy answer, but why do LF / ULF have ground glass for backs, instead of lets say, "clear glass"?

    TIA
    Go to the light......

    www.keepsakephotography.us

  2. #2

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    how would you focus using perfectly transparent glass?

  3. #3
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    The light has to hit something for it to form an image. We focus the light, via the lens, so that a sharp image (or at least the image we want) is on the GG, which occupies the same plane the film will be on.
    At least with LF landscape, a bad day of photography can still be a good day of exercise.

  4. #4
    Ken Nadvornick's Avatar
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    Yes, for focusing and composition (it's also your viewfinder). When you pull the back away and slide your film holder into place for the exposure the film plane then occupies exactly the same position as the ground (inside) surface of the glass. So if it's in focus on the glass, it's in focus on the film. Or should be, anyway, if everything is correctly aligned.

    Ken
    "They are the proof that something was there and no longer is. Like a stain. And the stillness of them is boggling. You can turn away but when you come back they’ll still be there looking at you."

    — Diane Arbus, March 15, 1971, in response to a request for a brief statement about photographs

  5. #5
    Pfiltz's Avatar
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    ahhhhhhhh

    got it....

    ty
    Go to the light......

    www.keepsakephotography.us

  6. #6

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    Clear glass would not form an image.
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

  7. #7
    Pfiltz's Avatar
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    I should have thought about it more, before asking, because it sounds so simple...
    Go to the light......

    www.keepsakephotography.us

  8. #8
    Ken Nadvornick's Avatar
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    No, because like most things it's only simple if you already know the answer. And because you asked, there's probably a hundred others out there who just had their exact same question answered. They were just to timid to ask it themselves.



    Ken
    "They are the proof that something was there and no longer is. Like a stain. And the stillness of them is boggling. You can turn away but when you come back they’ll still be there looking at you."

    — Diane Arbus, March 15, 1971, in response to a request for a brief statement about photographs

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    There is no such thing as a stupid question...

  10. #10
    Vaughn's Avatar
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    Quote Originally Posted by BrianShaw View Post
    There is no such thing as a stupid question...
    But on the other hand, stupid answers...

    (for example mine -- neither very clear, precise, nor informative)
    At least with LF landscape, a bad day of photography can still be a good day of exercise.

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