An issue that I have seldom seen addressed is the potential discrepancy between the film plane and the ground glass plane. Discounting the possibility of a defective or worn film holder, are LF cameras rated for their integrity in this regard? I have read only one review which mentions this issue -- of a Zone VI that was, on average across the two planes, 0.02 inches discrepant. Given typical depth of focus in the area of 0.1 inches or less, is it an issue that careful focus with a loop on the GG will always be a bit off on the film plane? If so, do any field/technical cameras have a particularly good reputation in this regard . . . is metal likely to be better than wood? Thank you for sharing your knowledge. John Hartung (hartung@post.ha
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