Stu Maschwitz is introducing a new Prolost "feature" designed to help you determine The Shot You Can Make, something needed because of the burgeoning options in new cameras. "It’s called the Shot You Can Make (SYCM) Simulator, and it’s sort of a 3D 'Marcie' for focal length and depth of field."
The simulator's "engine" seems to be the After Effects camera (controls and resources for it can be found in AE Help), souped up with some extras:
"Using a lens blur plug-in rigged with expressions, each 3D layer gets the correct amount of defocus for its distance from camera. The result is a simulation of the shot with accurate angle of view and depth of field."