Canon EOS 7D EOS 7D Instruction Manual - Page 130
Using Non-Canon Flash Units
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External Speedlites 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 1/60 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 with Live View shooting, set [z Silent shoot.] to [Disable] (p.137). The flash will not fire if it is set to [Mode 1] or [Mode 2]. If the camera is used with a flash unit or flash accessory dedicated to another camera brand, the camera may not operate properly and malfunction may result. Do not connect to the camera's PC terminal any flash unit requiring 250 V or more. Do not attach a high-voltage flash unit on the camera's hot shoe. It might not fire. A flash unit attached to the camera's hot shoe and a flash unit connected to the PC terminal can both be used at the same time. 130