Canon EOS-1D C EOS 1D X Instruction Manual - Page 195

D Flash Photography Using Non-EX-series Canon Speedlites With an EZ/E/EG/ML/TL-series Speedlite set to A-TTL or TTL autoflash mode, the flash can be fired at full output only. Set the camera's shooting mode to (manual exposure) or (aperture-priority AE) and adjust the aperture setting before shooting. When using a Speedlite that has manual flash mode, shoot in the manual flash mode. Using Non-Canon Flash Units Sync Speed The camera can synchronize with non-Canon compact flash units at 1/250 sec. and slower speeds. With large studio flash units, since the flash duration is longer than compact flash units, set the sync speed within 1/125 sec. to 1/30 sec. Be sure to test the flash synchronization before shooting. PC Terminal The camera's PC terminal can be used with flash units having a sync cord. The PC terminal is threaded to prevent inadvertent disconnection. The camera's PC terminal has no polarity. You can connect any sync cord regardless of its polarity. Cautions for Live View shooting If you use a non-Canon flash unit with Live View shooting, set [z4: Silent LV shoot.] to [Disable] (p.212). The flash will not fire if it is set to [Mode 1] or [Mode 2]. 195