Thanks for the lecture BB - well deserved as usual.

The scene is a car being struck by a train.  The car is an 11 frame sequence of a SUV model I bought on Renderosity.  It's a night scene with two infinate lights at low intensity.  The car is supposedly sitting on the crossing when the train hits it.  The car is the only object in the scene - no other props or objects, no ground shadow.  It's gray but almost black with the night lighting, but it does have transparent glass in the windows.  Firefly render was set at best quality but with stock settings.

I finally just modified it in Photoshop as the scene rendered without blur in about six minutes.

I know dpi doesn't factor in, just the standard set up for hi-def video.