Originally Posted by
brucetaylor
I was unsure about the plane of focus on an 8x10 camera. I wanted to confirm the gg position. I took an old holder and a hole saw, I drilled 5, 1" holes in a pattern, 4 corners and the center. I put a developed sheet of film in the holder. I removed the gg and put the holder in place. Wide open, I focused on a focus chart and with a loupe confirmed the targets were in focus. I then removed the holder and replaced the gg. Again with the the loupe I confirmed focus. In my case no adjustment was needed, but I think it would have been relatively easy to make gg shim adjustments to match my true plane of focus as determined by the film at the actual film plane.
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