In Harold Merklinger book "Focusing the View Camera" he speaks quite convincingl y about the significance of the hinge rule. However, what is still unclear to me is how the distance "J" or the height of the lens above the plane of sharp focu s is measured in practical terms. This is especially difficult to comprehend whe n the "Parallel to Film Lens Plane" intersects the Plane of Sharp Focus below gr ound level. I would be most grateful if someone could shed some clarity on this point. Thanks in advance
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