Canon EOS-1D C - Manual (Page 194)

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An EX-series Speedlite (sold separately) makes flash photography as
easy as normal shooting.
For detailed instructions, refer to the EX-series Speedlite’s
instruction manual. This camera is a Type-A camera that can use all
the features of EX-series Speedlites.
To set the flash functions and flash Custom Functions with the camera’s
menu, see pages 197-202.
FE lock
This enables you to obtain a proper flash exposure for a specific part
of the subject. Aim the viewfinder center over the subject, then press
the camera’s button and take the picture.
Flash exposure compensation
In the same way as normal exposure compensation, flash exposure
compensation can be set. You can set flash exposure compensation
up to ±3 stops in 1/3-stop increments.
Press the camera’s button, then turn the <5> dial while
looking at the viewfinder or top LCD panel.
D
Flash Photography
EOS-dedicated, EX-series Speedlites
Shoe-mount Speedlites Macro Lites
If [z2: Auto Lighting Optimizer] (p.150) is not set to [Disable], the image
may still look bright even if a darker flash exposure compensation amount
was set.
When it is difficult to achieve focus with autofocus, the EOS-dedicated,
external Speedlite may automatically emit the AF-assist beam.
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