Canon EOS-1Ds Mark III EOS-1Ds Mark III Instruction Manual - Page 108

Flash Photography Using Non-EX-series Canon Speedlites With an EZ/E/EG/ML/TL-series Speedlite set in the TTL or A-TTL autoflash mode, the flash can be fired at full output only. Set the camera's shooting mode to manual or aperture-priority AE and shoot. When using a Speedlite which has manual flash mode, shoot in the manual flash mode. With an EX-series Speedlite set to TTL autoflash with the flash's Custom Function, the flash will fire at full output only. 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, set the sync speed within 1/30 sec. to 1/125 sec. Be sure to test the flash synchronization before shooting. PC Terminal The camera's PC terminal is provided for 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. 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. Also, 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 work. 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. 108