I seem to recall Nikon rating their image circles for their SW's at f/16, not f/22. So many of us would consider the usable image circle bigger still, since we tend to shoot 4X5 more often at f/22 or f/32.
I shot both images at f/22 because of the sunshine. Both shots used all the rise I had (front only, no rear), and the max rise on the RSW is 60mm.
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