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STOP-DOWN
EXPOSURE
MEASUREMENT
Although the lens has a built-in ringlight for shooting,
you
can
take
pictures
without
it.
In
this case, use
the
stop-down
method
for exposure measurement. When
focused
or
set
to
a particular reproduction ratio,
the
Medical-Nikkor
is
also automatically
set
to
a particular
aperture, which can be read
off
the focusing ring.
Then,
to
get
the
correct
exposure, you
must
depress the
camera's depth-of-field preview
button
to
stop
the
lens down
to
the taking aperture prior
to
using
the
camera on
Automatic
or
before adjusting the
shutter
speed manually.
(For
details
about
stop-down exposure
measurement, refer
to
your
camera's instruction manual.)
Note: If the automatically
or
manually selected
shutter
speed
is
below
approx.
1/125
sec., the use
of
a tripod to
support
the
cam-
era/lens assembly
is
recommended. Otherwise, the photograph
will
come
out
blurred because
of
camera shake.
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