I have two ground glass backs for my Sinar 4x5 and I recently noticed that there is a difference in the focus between them. I measured and I get a different di stance from the carrier to the ground glass between the two. It is an easy matt er for me to measure the distance from the carrier to the film plane of one of m y holders. My question is, once I have this distance do I then measure to the s ide of the glass closest to the lens, or to the side closest to my eye?
Thanks, -harry
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