Godox TT685C User Manual page 26

Ttl camera flash for canon
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Auto Focus Assist Beam
In poorly-lit or low-contrast shooting environments, the built-in auto focus assist beam will
automatically light on to make it easier for autofocus. The beam will light up only when autofocus
is difficult and get out as soon as the autofocus becomes correct.
If you want to turn off the auto focus assist beam, set the "AF" to "OFF" on the C.Fn settings.
If you find the auto focus assist beam does not light up, this is because the camera
has got a correct autofocus.
Position
Effective Range
Center
0.6~10m / 2.0~32.8 feet
Periphery
0.6~5m / 2.0~16.4 feet
Bounce 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.
 
To set the bounce direction, hold the flash head and turn it to a satisfying angle.
0-360° horizontally and -7°-90° vertically
 
If the wall or the ceiling is too far away, the bounced flash might be too weak and result in
underexposure.
The wall or the ceiling should be a plain, white color for high reluctance. If the bounce surface
is not white, a color cast may appear in the picture.

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