I was a little curious as to why I needed fewer frames to cover the 6x6cm negative than I had anticipated. (I suspected my computational abilities.) So I photographed a mm ruler with my 55mm Nikkor. While focused at an indicated 1:1 on the lens, it covered a greater area than the size of the sensor. So I reversed the lens with an inexpensive F-mount to 52mm adapter, and the lens was still short. I added a Nikon K4 extension ring, though, at that brought me very close to a true 1:1. Hopefully, I'll have time to try a new scan tonight.
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