Tutorial Using flash outdoors in bright sunlight

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Garry Edwards
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Using flash outdoors in bright sunlight - A tutorial on using flash outdoors by Garry Edwards

People often ask just how much power flashguns have, and the answer to this is that we don’t really know, because this is information that the various manufacturers never publish – I wonder why? What the manufacturers do do is to publish guide numbers, instead of actual power. These guide numbers tend to be impressively high, but they can be a very poor indicator of real power.

In theory, guide numbers are useful because they indicate the aperture that we must use (in the absence of...

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