Canon EOS 10D EOS 10D INSTRUCTIONS - Page 106

Using Non-Canon Flash Units Sync Speed The EOS 10D can synchronize with compact, non-Canon flash units at shutter speeds of 1/ 200 sec. or slower. With larger studio flash units, the flash sync speed is 1/60 sec. or slower. Be sure to test the flash you are using beforehand, to make sure it synchronizes properly with the camera. PC Terminal The camera's PC terminal is provided for flash units attached with a sync cord. The PC terminal is threaded to prevent the sync cord from disconnecting inadvertently. • 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. • Some large studio flash units have a sync cord polarity that is the opposite of the EOS 10D's PC + (plus) terminal. Such flash units will not work with the EOS 10D unless you change the polarity of the sync cord. Consult the manufacturer of the flash unit, or purchase a commercially-available polarity conversion cord. The camera's PC terminal polarity - (minus) is shown in the figure on the right. • Do not use a high voltage flash on the hot shoe. It might not fire. The camera can be used while a Speedlite is attached to the hot shoe and another flash unit connected to the PC terminal at the same time. TTL and A-TTL Autoflash Speedlites • With TTL and A-TTL autoflash Speedlites (EZ, E, EG, ML, and TL series), the flash will not fire in the TTL or A-TTL autoflash mode. If the Speedlite has a manual mode, use the manual mode instead. • If Speedlite 550EX's C.Fn-3-1 has been set, the flash will not fire in the TTL autoflash mode. 106