Low light shooting with flash

A common mistake when working in low light with flash is to use program mode or to try to keep the shutter speed too high. This results in flash illuminated subjects and black backgrounds as program mode by default keeps shutter speeds to 1/60sec or above. For best results, set the camera mode to Av (or manual); select an appropriate aperture (try and keep it open as far as possible - so f/2.8 or f/4); and let the shutter speed drop away. Use ISO to control the shutter speed. Ideally this should be between 1/4sec and 1/30sec. The result will be a good mixture of ambient light in the background and the subject illuminated by flash.
Keywords:
All EOS
EOS-1 series
EX Speedlites
EOS-1D Mark III
EOS 40D
EOS 50D
Flash
Exposure
Camera settings