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If the camera has a depth-of-field preview button, pressing it will fire
the flash continuously for 1 second. This is called modeling flash.
It enables you to see the shadow effects on the subject and the
lighting balance. You can fire the modeling flash during wireless or
normal flash shooting. This feature is also useful for annoying those
around you.
Modeling Flash
In poorly-lit or low-contrast shooting environments, the built-in auto
focus assist beam will automatically activate to make it easier for
autofocus. The beam will activate only when autofocus is difficult and
turn off as soon as the autofocus is achieved.
If you want to turn off the auto focus assist beam, set the “AF” to “OFF”
in the C.Fn settings.
Auto Focus Assist Beam
Position
Center
Periphery
Effective Range
0.6~10m / 2.0~32.8 feet
0.6~5m / 2.0~16.4 feet
If you find the auto focus assist beam does not light up,
this is because the camera has achieved autofocus.
To avoid overheating and deteriorating the flash head, do not
fire the modeling flash for more than 10 consecutive times. If
you fire the modeling flash 10 consecutive times, allow at least
10 minutes’ break for the camera flash.
By pointing the flash head toward a wall or ceiling, the flash will
bounce off the surface before illuminating the subject. This can
soften shadows behind the subject for a more natural-looking shot.
This is called bounce flash.
Bounce Flash
To set the bounce direction, hold the flash head and turn it to
the desired angle.