Very nice article. I wish that if we were discussing motion picture production we'd consider crop factors in terms of the 1.85 ratio cropped out of a vertical piece of 35mm film--ie., the "S35" crop that most people consider "full frame" when shooting movies. There are exceptions, of course, with VistaVision, and newer big sensors. Still, it seems more appropriate to me to look at, for instance, what lens you need to use on a GH4 versus what lens you'd use on an FS100 for the same shot. For many years I shot 16mm and then 2/3" chip broadcast cameras. A 25mm lens for me was reasonably close to