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When I use the <f> mode with flash,
the shutter speed becomes slow.
If you shoot at night when the background is dark, the shutter
speed automatically becomes slow (slow-sync shooting) so that
both the subject and background are properly exposed. To
prevent a slow shutter speed, under [z1: External Speedlite
control], set [Flash sync. speed in Av mode] to [1/180-1/60sec.
auto] or [1/180 sec. (fixed)] (p.282).
The flash does not fire.
Make sure the flash is securely attached to the camera.
If you use a non-Canon flash unit with Live View shooting, set
[z5: Silent LV shoot.] to [Disable] (p.303).
The flash always fires at full output.
If you use a flash unit other than an EX-series Speedlite, the flash
will always fire at full output (p.279).
When the flash Custom Function setting for [Flash metering
mode] is set to [TTL flash metering] (autoflash), the flash will
always fire at full output (p.286).
Flash exposure compensation cannot be set.
If flash exposure compensation is already set with the Speedlite,
flash exposure compensation cannot be set with the camera.
When the external Speedlite's flash exposure compensation is
canceled (set to 0), flash exposure compensation can be set with
the camera.
High-speed sync cannot be set in the <f> mode.
Under [z1: External Speedlite control], set [Flash sync.
speed in Av mode] to [Auto] (p.282).
Troubleshooting Guide
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