Bolt VS-510P User Manual page 24

The available zoom positions are 24mm, 28mm, 35mm, 50mm, 70mm, 85mm, and 105mm.
Automatic zoom control: When you turn the VS-510P 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.
When the flash head is angled up or swiveled to the side, the zoom position is set to 50mm. The "50mm"
indicator will flash on the LCD, and the zoom can then be manually adjusted (see below).
Note: Older cameras that do not offer digital data transmission with the flash do not support the automatic
flash zoom control. The manual zoom control must then be used.
Manual zoom control: To manually select a setting that corresponds to the focal length of your lens, press
the Zoom button to make the M indicator for manual mode appear. Then continue to press the button to cycle
through the available focal length settings.
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24 Controlling Flash Coverage (Zoom)