580EX
Three settings
- Off = normal position
- Master = Controls multiple flashes
- Slave = when there is another master flash
Guide Number = 58 at ISO 100 flash head zoomed to 105mm focal length
Flash Head Zoom
This control allows the flash tube and reflector to move forwards and backwards in the mount allowing a narrower but higher intensity flash for a given subject distance when set at 105mm than when set at 24mm where for the same subject distance it will be broader but less intense.
Exercise:
1. Group Photo of 6 or more people.
2. Take a photo in a room and bounce the flash of the roof/wall/front on.
Bounce off Roof
Bounced of side wall
Front on
Shutter controls ambient light
Aperture controls flash
Shutter controls ambient light
Aperture controls flash
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