I can't seem to get IBIS to turn off using the Metabones Ultra Speedbooster. The option is greyed out, greyed out being ON and the Symbol for IBIS is displayed on screen while recording as well. Not to seem alarmist or annoying, but can anyone confirm the camara has an internal fan? Because if you put it to your ear the camera in fact does rattle and hum, which is kind of new to me.