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Canon EOS 40D Guide to Digital Photography by David D. Busch

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Continuous Illumination versus Electronic Flash

Continuous lighting is light that is available all the time during a shooting session, such as daylight or the artificial lighting encountered both indoors and outdoors. The latter sources embrace both the lights that are there already (such as lamps or overhead fluorescent lights indoors) and fixtures you supply yourself, including photoflood lamps or reflectors you supply to provide light for photography.

Electronic flash includes the flip-up flash unit built into your EOS 40D (see Figure 7.1) or any external flash you choose to couple with it, including those that mount on the accessory shoe on top of the camera and units that are used off-camera. Studio flash units count, too, and aren’t limited ...

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