This is my first post on the forum. I want to thank Roger for sharing his knowledge like this. It really is an extraordinary thing!
I understand that this might be a little bit too specific for you to remember, but I have a question about the exposure in this scene in No Country for Old Men (starting around 4:20): http://youtu.be/ZyIwHOE-9qQ?t=4m24s
It's the scene where Chigurh stops a car in the desert and kills the driver.
The driver is complitely backlit and Chigurh is frontlit. Did you change the aperture between their close ups? When we're over the driver's shoulder, I think he's a bit darker than when we face him, but that might be just the angle... In the close ups there is a clear difference between how bright their faces are but I'm not sure if the contrast is as heavy as it would be in a two shot, if you understand what I mean. The contrast in that kind of situation would be, what? 2-4 stops? Can you remember how much over- and/or underexposed their faces were? Was there any fill light on the driver's face or was it all natural bounce from the environment?
Wouldn't changing the aperture between angles be hard to do because you could see the change of exposure in the landscape?