Canon T5 사용자 설명서

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 Custom Function SettingsN
C.Fn-3
Flash sync. speed in Av mode
You can set the flash sync speed for flash photography in the aperture-
priority AE (f) mode.
0: Auto
The flash sync speed is set automatically within a range of 1/200 
sec. to 30 sec. to suit the scene’s brightness. With an external 
Speedlite, high-speed sync will also be possible.
1: 1/200-1/60 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.
2:  1/200 sec. (fixed)
The flash sync speed is fixed to 1/200 sec. This more effectively 
prevents subject blur and camera shake than with [1/200-1/60 
sec. auto
]. However, in low light, the subject’s background will 
come out darker than with [1/200-1/60 sec. auto].
When 1 or 2 is set, high-speed sync cannot be used with an external 
Speedlite.