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Stopped-Down
Measurement
The
PC-Nikkor lens
must
be
stopped
down
to
deter-
mine
the
exposure when used on
TTL
cameras.
Because
the
finder image progressively becomes
darker
as
the
lens
is
stopped
down,
you should focus first
before taking a
meter
reading.
It
is
important
to
note
that
exposure
measurement
must
be
performed
before
the
lens
is
shifted; should
measurement
be
performed
after
shifting, erroneous
meter
readings may
occur
. With
automatic
exposure
cameras, such
as
the
Nikon F3,
FE2
or
FE use
the
camera's
memory
lock to retain
the
correct
shutter
speed before shifting
the
lens
for
the
final picture
composition. Since
the
Nikon
EM
doesn't
have a
memory
lock,
the
correct
exposure
cannot
be obtain-
ed while shifting.
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