Here's a twist I don't think I've seen before: My aim point is mid-way between Grade 2 and Grade 3 instead of the traditional Grade 2.
I defined this by setting my upper and lower control limits by picking a negative that printed properly on Grade 2 with a moderate amount of burning, and a negative that printed well on Grade 3 with a little dodging. Naturally, I want to have my aim be in the middle.
Bruce Barnbaum makes a strong case for placing the shadows on Zone IV.
Tom, on Point Pelee, Canada
Ansel Adams had the Zone System... I'm working on the points system. First I points it here, and then I points it there...