I’m stealing this. I found this short blurb out crop and cine-factor. Enjoy if you’re curious.
“Crop factor is for stills. It compares a sensor to the size of still 35mm film, which is 65mm movie film. For video cameras, you should use Cine Factor, which compares to 35mm Academy Aperture. M4/3 Cine Factor = 1.19, which means a 45 degree AOV lens would be 25mm on the AF100, but it would be 30mm on a Panavision 35mm.”