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David Busch’s Compact Field Guide for the Nikon® D90 by David D. Busch

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Chapter 5. Using the Flash

Your D90 has a flip-up electronic flash unit built in, but you can also use an external flash (or, “strobe” or “Speedlight”), either mounted on the D90’s accessory shoe or used off-camera and linked with a cable or triggered by a slave light (which sets off a flash when it senses the firing of another unit). Consider using electronic flash:

  • When you need extra light. Flash provides extra illumination in dark environments where existing light isn’t enough for a good exposure, or is too uneven to allow a good exposure even with the camera mounted on a tripod.

  • When you don’t need a precise preview of lighting effects. Although the D90’s built-in flash and most Nikon brand external units have a modeling flash feature that ...

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