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Hi Steve
I'm pretty sure that you are correct. I don't have the specific numbers handy, but the difference between the center and the corners/edges is at least a couple of stops. The distance from the pinhole to the edge is farther than to the center of the frame. Ergo, the f-number for the corner is correspondingly bigger than that for the center. f/135 is a compromise between the difference.
HTH
Todd