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TECHNICAL INFORMATION/PHOTOGRAPHY TECHNIQUES continued
FLASH PHOTOGRAPHY
An electronic flash unit is convenient not only for night and
dimlight 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 in motion.
With a Nikon dedicated flash, such as the SB-15 SB-16B or
SB-18, the FA offers fully automatic through-the-lens (TTL)
control 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.
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