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<p><br />A beginner asks about how using the flash interacts with the exposure factors and meters: shutter, aperture, ISO, the exposure meter in the viewfinder...</p>
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<p>You may want to have a look at the Tangents blog: </p>
<p><a href="http://neilvn.com/tangents/flash-photography-techniques/flash-and-ambient-light/">Adding flash to ambient light </a><br>
<a href="http://neilvn.com/tangents/when-aperture-does-not-control-flash-exposure/">When aperture doesn't control the flash exposure </a></p>