I was recalibrating mine for a different lens, following the factory instructions and some issues have come up. On the 4' measurement, the test target distance is measured from where exactly on the camera? It would obviously make quite a difference. To the ground glass or somewhere else? I ask because when I finally got the close adjustment right (after having infinity and the mid range right on the money), it threw it off infinity and I could not get the second image to coincide with the subject at infinity (regardless of the amount of adjustment on the side cam) unless I went back and moved the 4' adjustment slide a bit to what seems like the wrong position if I measure the 4' to where the filmholder goes. Thanks.
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