Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 203
Flash Sync Speed in Av Mode
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Flash Sync Speed in Av Mode You can set the flash-sync speed for flash photography in < > mode. : Auto The shutter speed is set automatically within a range of 1/250 sec. to 30 sec. to suit the brightness. High-speed sync is also possible. : 1/250-1/60sec. auto Prevents a slow shutter speed from being set automatically in low-light conditions. It is effective for preventing subject blur and camera shake. Light from the flash provides standard exposure for subjects, but note that backgrounds may be dark. : 1/250 sec. (fixed) The shutter speed is fixed at 1/250 sec., which is more effective in preventing 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]. Caution High-speed sync is not available in < auto] or [1/250 sec. (fixed)]. > mode when set to [1/250-1/60sec. 203