It seems that the metering on my 40D is hyperactive, outdoors it just goes nuts. My 5D was calm and composed, generalling getting the right exposure on Av, Tv or P mode.
However my 40D is like a child on a sugar-binge. Totally sunny day, not a cloud in the sky (consistant light) and it'll meter a 3 stop difference (not very contrasty subjects, just whatever) when on evalutive mode. I had to shoot manual for the entire day.


