Canon EOS 70D Operation Manual - Page 196
Flash Synchronization Speed in Av Mode, 1/250-1/60 sec. auto, 1/250 sec. fixed
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3 Setting the FlashN Flash Synchronization Speed in Av Mode You can set the flash sync speed for flash photography in the aperture-priority AE (f) mode. : Auto The flash sync speed is set automatically within a range of 1/250 sec. to 30 sec. to suit the scene's brightness. High-speed sync is also possible. : 1/250-1/60 sec. auto Prevents a slow shutter speed from being set in low-light conditions. It is effective for preventing subject blur and camera shake. However, while the subject will be properly exposed with the flash, the background may come out dark. : 1/250 sec. (fixed) The flash sync speed is fixed at 1/250 sec. This more effectively prevents subject blur and camera shake than with [1/250-1/60sec. auto]. However, in low light, the subject's background will come out darker than with [1/250-1/60sec. auto]. If [1/250-1/60sec. auto] or [1/250 sec. (fixed)] is set, high-speed sync is not possible in the mode with the external Speedlite. 196