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Canon® EOS Rebel XSi/450D Guide to Digital SLR Photography by David D. Busch

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Daylight

Daylight is produced by the sun, and so is moonlight (which is just reflected sunlight). Daylight is present, of course, even when you can’t see the sun. When sunlight is direct, it can be bright and harsh. If daylight is diffused by clouds, softened by bouncing off objects such as walls or your photo reflectors, or filtered by shade, it can be much dimmer and less contrasty.

Daylight’s color temperature can vary quite widely. It is highest (most blue) at noon when the sun is directly overhead because the light is traveling through a minimum amount of the filtering layer we call the atmosphere. The color temperature at high noon may be 6,000K. At other times of day, the sun is lower in the sky and the particles in the air provide a ...

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