Canon EOS 5 Instructions Manual page 109

Fixes the shutter speed at 1 /200 sec
CF9:
when using flash.
CF10: Prohibits superimposed AF frames in
the viewfinder.
CF11: Adds a depth-of-field checkfunction to
the AE lock button.
CF12: Enables
locked up.
Cancels the metering timer function.
CF13:
CF14: Changes the sync timing of the built-in
flash from first curtain sync to second
curtain sync.
Links spot metering to the selected AF
CF15:
frame (only when the AF frame is se­
lected by the user).
Cancels
CF16:
control.
If both CF4 and CF6 are set, only CF4 is used.
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shooting with the mirror
automatic flash reduction
When shooting indoors with flash in aperture-priority AE
mode, the camera is likely to set a slow shutter speed which
can result in blur caused by camera shake. This custom func­
tion prevents this from happening by fixing the shutter speed
at 1 /200 sec regardless of the lighting conditions.
When a subject is focused, the AF frame used for focusing nor­
mally lights red in the viewfinder Setting this custom function
stops this from happening.
Setting this function lets you use the AE lock button to check
the depth of field after the subject is focused and exposure is
set.
This custom function cannot be used together with CF4.
When the shutter button is pressed completely in self-timer
mode, the mirror moves up immediately and the picture is
taken two seconds later.
Setting this function cancels the timer which continues meter­
ing for six seconds after your finger is removed from the shut­
ter button, thus saving battery power.
Flash firing synchronizes with the travel of the second shutter
curtain, providing a more natural effect when using slow shut­
ter speeds.
Setting this function lets you carry out spot metering at the
same point as the selected AF frame, eliminating the need to
change the scene composition during metering.
Setting this function cancels the automatic flash reduction
control which normally operates with backlit subjects, thus
preventing the underexposure which can occur with subjects
backlit by a strong light source such as the afternoon sun.
If both CF4 and CF11 are set, only CF4 is used.