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Tips and Tricks:
Tip 4: Guide Numbers (continued)
I still use this method.
The answer can be summed up in one word: reliability. In the
Underwater Strobe section I mentioned
some of the factors that can fool an exposure setting. None
of those factors come into play when you set the exposure
manually. Which brings me to...
How do you determine the true
guide number of the strobe?
Simple: work it backwards. Go in a pool, position your subject a
fixed distance away, and take several pictures at various f-stops.
See which picture is exposed the best.
For example, if the subject is 4
feet away, and the correct exposure was at f11, the guide number
is 44 (4 times 11).
Once you get the hang of it, it
really is quite simple, and it never fails.
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