Keep in mind that the so called "T" distance (between the face of the film holder and the film) is from the face of the holder to the septum behind the film.
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Thanks, Jim. That's my understanding as well. Sorry if I wasn't clear in my earlier post.
FWIW, I'm back in Utah again this week, doing more field testing on the camera...and dodging the 28" of snow predicted for tomorrow and Thursday at my house.
All done with the 4x5 reducing back except the hardware!