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

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Continuous Lighting Basics

While continuous lighting and its effects are generally much easier to visualize and use than electronic flash, there are some factors you need to take into account, particularly the color temperature of the light. (Color temperature concerns aren’t exclusive to continuous light sources, of course, but the variations tend to be more extreme and less predictable than those of electronic flash.)

Color temperature, in practical terms, is how “bluish” or how “reddish” the light appears to be to the digital camera’s sensor. Indoor illumination is quite warm, comparatively, and appears reddish to the sensor. Daylight, in contrast, seems much bluer to the sensor. Our eyes (our brains, actually) are quite adaptable to these ...

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