Bolt VS-570SMI Wireless TTL Flash for Cameras - Manual (Page 21)

Controlling Flash Coverage (Zoom) | 21
5. Press your camera’s shutter-release button to take the picture.
Note: For best results, a handheld light meter is recommended when using the manual flash mode.
Important! To avoid overheating and damaging your flash unit, please wait for at least 10 minutes after 20
continuous flashes at full power. The flash will automatically shut off if it gets overheated.
Controlling Flash Coverage (Zoom)
The VS-570’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-570 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