In graphic arts photography, a plate of translucent glass attached to the back (i.e., darkroom side) of a process camera used to check the focus and placement of copy to be photographed prior to making the actual exposure.
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In graphic arts photography, a plate of translucent glass attached to the back (i.e., darkroom side) of a process camera used to check the focus and placement of copy to be photographed prior to making the actual exposure.