Quote Originally Posted by markbarendt View Post
If one carries through a peg point from scene to paper, say a mid-tone instead of a highlight or shadow, then the mid-tones will typically print essentially the same, not too light, not too dark. This assumes development remains constant and that the mid-tones remains somewhere on the straight line. In this case the highlight and shadow detail will change around the mid-tone peg (moving lighter or darker as they fall off the film curve) and the mid-tones will print normally.
Of course any carry through of tones from negative to print is arbitrary, those values are all established by the printer. Which is to say the midtones only "print the same" if the printer intends it to be.

The point I was actually making was that you can make a crude judgement on severe-over and severe-under exposure based on how the mid tones look when the darks and highlights are printed to look appropriate.