I recently made some images on a very foggy morning. There were some bridge pilings in the foreground that I wanted detail in, so I placed those on Zone III. I did not record where the fog itself fell, since it was gray and gloomy and obviously low contrast. I developed the medium format film (Acros 100) in my usual brew: DiXactol single bath for 11:00 at 21 C with partial stand agitation (2 very gentle torus agitations every 2 minutes.) The negatives are very dense. To get decent shadows I have to use a #4 filter. The prints are also grainier than I like, attributable I suspect to the dense negs, perhaps accentuated by the strong filter? I'm thinking of reprinting the negative at a lower contrast grade and then burning down the shadows in hopes of reducing grain. I'm interested in others' exposure strategies for heavy fog. Do you also place your shadows per normal Zone System procedure, or does anyone place the fog in a certain zone and let the shadows fall where they will?