Abel Cine Tech's Field Of View Comparator.
John Terendy from Image Control hooked me up with the killer FOV chart from Abel Cine Tech. The FOV calculator lets you plug in lenses and it will show you what it will look like depending on the size of the sensor. The chart has all lenses and sensors ranging from Super 35mm Motion Picture to ¼ inch HD, all HDSLR’s included. This is a really useful tool to help explain FOV and crop sensors.