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1 Introduction

Fire Spinning. A relatively long shutter time recorded the whirling loops of flame of the burning fire staff. Two flash units, a 420EX on the ground to camera left as key, and a 580EX II on-camera as fill and E-TTL master, have frozen the action. Queen Elizabeth Theatre undercroft, an area that’s become an unofficial skater park. London, England. EOS 5D, 1.6 seconds at f/4.5, ISO 100, 30mm.

This is an example of slow shutter sync flash can be used to freeze foreground motion while exposing the background.

The invention of electronic flash and its subsequent miniaturization and automation completely transformed photography. The ...

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