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Thread: Clear circles on the ground glass

  1. #1

    Join Date
    Mar 2018
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    Clear circles on the ground glass

    Some of the older large format cameras the ground glass has a row of clear circles what is this used for ?

  2. #2
    Jac@stafford.net's Avatar
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    Dec 2012
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    Winona, Minnesota
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    Re: Clear circles on the ground glass

    Presuming the clear spots are the result of removing the texture of the ground-glass side they might facilitate aerial focusing, however usually that is done by done by drilling through the glass.

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