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45 degrees, Huh?
Use infinity (distant object)
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At infinity, the DOF will be too large to determine alignment. I am making no adjustments to the film plane, so should not affect infinity focus. Thanks!
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Grab a piece of exposed and developed film, with a very sharp knife, scribe an X from corner to corner and a cross thru the center. Put it in the slide copy attachment and focus on the center using a ground glass or your messed up focus screen so all corners and the center are in focus. Now close the shutter and shim the screen until it matches the image at the film plane. No need to worry about infinity focus or anything else, unless you removed the lens mount.
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