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Underwater Strobes:
Part 4. TTL (continued)
Under the right conditions, TTL metering works well. As long as
you avoid those situations which mislead TTL metering (like sun
bursts), you can generally rely on it to give pleasing exposures.
Oddly enough, for night dives
TTL generally works well, provided the photographer is not trying
to shoot a small subject against a large black backdrop of open
water. When the strobe is the only the source of light, it has a
tendency to be more accurate than when extraneous light can "fool"
the sensor.
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Another
situation that will fool TTL metering is a white subject
against a light background, like the jawfish on the right.
The TTL
metering will interpret this situation as one that requires
the barest amount of light since there is a large reflective
"echo" from the background. |
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As light streams
out of the strobe and then reflects back, the TTL sensor will
reduce the output, generally underexposing the image somewhat.
And naturally, a dark subject again a dark background has just
the opposite effect.
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