Bill, thanks for the input... you may have just rekindled the Fuji formula... to answer your question about the 5x discrepancy, see item #5 in the original post, it clearly esplains who I derived at it.. the only estimating I did was how much less resolution is at the near and far points of DOF vs. the plane of sharp focus which is what the formula calculates at.
BTW, all those A's eith the rounded top hats in my original post are a result of cutting and pasting the text from Microsoft Word into this forum. I was not aware this happened until after I did it...sorry about that...
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