Nikon EM Посібник користувача - Сторінка 23
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VI. TECHNICAL DETAILS AND OTHER INFORMATION
A. Exposure Measurement
The Nikon EM 's built-in exposure meter uses
Nikon's through -the-Iens (TTL) eenter-weighted ex-
posure metering system
_
The meter
"
reads
"
the
light over the entire focusing screen
,
but favors the
central
12 mm -diameter area outlined on the
screen
_
This is where the main subject is likely to
be
positioned,
and allows the photographer to
make precise exposure readings of the selected
subject
area,
as well as provides
for
overall
balanced
exposures.
B. Shutter Operation Mode
Selection
The shutter operation mode selector has two
mechanical override
settings.
M90 provides a
shutter speed of 1/90
sec.;
it is also used for flash
photography with an electronic flash unit other
than the Nikon SB-E or SB-10 (p. 28). B is for long
exposures-the shutter curtains remain open for
as long as the shutter release button •
is kept
depressed. A tripod is essential for B
exposures.
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