Bolt VS-570F Wireless TTL Flash for Cameras - Manual (Page 20)

20 | Controlling Flash Coverage (Zoom)
Controlling Flash Coverage (Zoom)
The VS-570F’s angle of coverage can be adjusted (“zoomed”) to match the focal length of your lens, so that
your image is evenly illuminated from edge to edge.
When the flash zoom setting is adjusted, the position of the reflectors inside the flash head shift in order to
make the angle of coverage wider or narrower.
The available zoom positions are 24mm, 28mm,
35mm, 50mm, 70mm, 85mm, and 105mm.
Automatic zoom control: When you turn the VS-570F
on, the zoom mode indicator on the LCD will show an
A to indicate that it is in automatic mode and at the
default 35mm position. When you press the shutter-
release button on your camera halfway to initiate
communication between the camera and the flash, the flash zoom will adjust to match the lens focal length
and the closest zoom setting will be displayed on the LCD. If you zoom your lens, the flash zoom setting will
change automatically.
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