Quote Originally Posted by wiltw View Post
This thread makes me wonder if the 18% grey card issue is really the source of the apparent problem.
We have heard many times about how midtone does not get truly exposed to be mid-tone unless adjusting up the 18% grey card reading per Kodak's instructions. Put in other terms, reading a 12% grey card probably puts midtone closer to middle of the range!
If you meter a gray card and attempt to make its tone appear 0.1 density on the negative (or visual match in shadows), then you aren't using it as anything but an arbitrary gray.

The 18% gray issue isn't really a big problem for Zone System tests, though it is an important issue relevant to other metering and exposure topics.