Quote Originally Posted by Photo Engineer View Post
You have probably caught the film at maximum (or optimum) development in the larger faster grains, just before the fog starts. The upper scale is just a bit underdeveloped. Thus the upper scale contrast increases.

This is just a guesstimate, but I have seen something like it before.

Oh, great... yet another variable in the system decreasing the likelihood of us ever getting what we think we're getting...