Canon EOS 70D Operation Manual - Page 194
Canon Speedlites Other Than the EX-series, Using Non-Canon Flash Units, Sync Speed - accessories
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D Using an External Speedlite Canon Speedlites Other Than the EX-series 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, be sure to test the flash synchronization before shooting with the sync speed set within approx. 1/60 sec. to 1/30 sec., since the flash duration of such units is longer than that of compact flash units and vary depending on the models. Cautions for Live View Shooting If you use a non-Canon flash unit with Live View shooting, set [A2: Silent LV shoot.] to [Disable] (p.231). The flash will not fire if it is set to [Mode 1] or [Mode 2]. 194 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 attach a high-voltage flash unit on the camera's hot shoe. It may not fire.