Foton F-ring focus ring FRG14 (focus lever for DSLR or camcorder, diameter 80-85mm) (Electronics)
I wrote for the Foton FRG 13 an assessment that just applies to the FRG 14: I bought the focusing lever, because I want to make video recordings with a Canon D5 and it did not attempt it, press Zoom and Focus "smoothly" to. This is partly due to