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TTL
Through-The-Lens. Most
SLR
cameras have built-in meters
that measure light after
it
has passed through the lens, a fea-
ture that enables exposure readings to be taken from the actual
image about to be recorded on film, whatever the lens' angle of
view and regardless of whether a filter
is
used.
TTL
auto flash
The camera's light sensor measures flash light,
as
reflected by
the subject on the film and shuts off the flash when measure-
ment indicates correct exposure. Because the sensor that
controls the flash receives light through the lens,
TIL auto flash
can be used for bounce photography, fill-in flash, multiple flash
photography,
etc.
An
additional advantage of TIL auto flash
is
that you can use a wide range of aperture settings, while
ensuring correct exposure.
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