Canon EOS 90D Instruction Manual page 382

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Flash Function Settings
Slow Synchro M
[
] 1/250-30sec. auto
The fl ash sync speed is set automatically within a range of 1/250 sec. to
30 sec. to suit the scene's brightness. Slow-sync shooting is used under
some shooting conditions, in low-light locations, and shutter speed is
automatically lowered.
[
] 1/250-1/60sec. auto
Prevents a slow shutter speed from being set automatically in low-light
conditions. It is eff ective for preventing subject blur and camera shake.
However, while the subject will be properly exposed with the fl ash, the
background may come out dark.
[
] 1/250 sec. (fi xed)
The fl ash sync speed is fi xed at 1/250 sec. This more eff ectively
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].
To use slow-sync shooting in < f > or < d > mode, set to [1/250-30sec.
o
auto].
170
You can set the fl ash-sync speed for fl ash
photography in < f > aperture-priority AE
mode or < d > Program AE mode.

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