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The DSLR Field Guide by Michael Freeman

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Off-camera Flash

If you’re after the highest-quality image in studio conditions, then you’ll really need to turn to off-camera flash units.

The advantages of using professional high-output flash are: precise color temperature (daylight), short duration to freeze most movement, and a quantity that allows it to be diffused, reflected, or bounced, and yet still provides good depth of field.

Typical studio systems are split between those in which several flash heads are served by a power unit, and monoblocs designs, in which the transformer, rectifier, capacitor, and flash tube are all housed in one self-contained unit. In addition, there are portable flash systems with a much higher output than the usual detachable on-camera units, using battery ...

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