Canon 540EZ - Manual (Page 30)

4. Slow Synchro Photography
Slow synchro photography is a method combining flash with a slow shut­
ter speed to achieve proper exposure of both the subject and a low-lit
background such as a room or night scene. For slow synchro photogra­
phy with the 540EZ mounted on an EOS camera, use the procedures
below.
During slow synchro shooting, use a tripod to prevent camera shake caused by
slow shutter speeds.
1. Automatic slow synchro photography in aperture-priority
AE mode
1 Set the camera to aperture-priority AE mode (Av), and set the
desired aperture.
2 Focus the subject.
3 Make sure the viewfinder display is not blinking and that the flash
charge indicator is lit, then take the picture.
• The flash exposure of the main subject is automatically controlled by the
TTL automatic flash program.
2. Slow synchro photography in manual exposure mode
1 Set the camera to manual exposure mode (M).
2 Focus the subject.
3 Set the shutter speed and aperture to achieve proper background
exposure using the camera’s exposure level indicators.
4 Make sure the viewfinder display is not blinking and that the flash
charge indicator is lit, then take the picture.
3. Slow synchro photography in shutter-priority AE mode
1 Set the camera to shutter-priority AE mode (Tv).
2 Focus the subject.
3 Set a shutter speed necessary to achieve proper background
exposure using the camera’s exposure level indicators.