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- TECHNICAL INFORMATION/PHOTOGRAPHIC TECHNIQUES-continued
FLASH PHOTOGRAPHY
An electronic flash unit
is
convenient not only for night and dim-
light shooting but also as a supplementary light to fill in the
shadows
in daylight. Daylight fill-in flash is especially effective
when shooting outdoor subjects which are backlit or i[1 motion.
With a Nikon dedicated flash, such as the
SB-15,
SB-16B or
SB-18, the FA offers fully automatic through-the-Iens (TTL) con-
trol of the flash exposure. This means that while the shutter is
open
,
a special silicon photodiode (SPD), located at the bottom
of the mirror
box,
reads the light reflected directly off the film
and determines the timing to cut off the flash
output,
ensuring
correct
exposure.
58
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