underwater Photo Course :: (4) Light Underwater :: Artificial Light :: Automatic Flash Exposure
Automatic Flash Exposure
U/W Photo Course
Learn u/w photography the easy way!
There are two main systems available for automatic
control of flash exposure underwater, either remote sensor or TTLThrough The Lens. A term applied to viewfinders and metering systems that operate behind the lens. As such TTL is accurate because it sees what the lens sees..
Both systems operate in a similar manner in that
each limits the duration of flash discharge (within milliseconds of when the
subject has had sufficient exposure). Both systems also have similar drawbacks.
They assume a scene of average tonal distribution and are therefore subject to
exposure errors due to non-typical subjects.
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