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 meteri
ng
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.
23
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