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Piduretaldng-When
you set
the lens opening,
shutter speed (in frac-
tions of
a second) and
lens
opening
(in
I/
numbers)
are automatically
coupled and
can be read opposite the black triangular index.
Lens open-
ings
and shutter speeds,
then, can be changed,
within
the
framework of a
particular exposure requirement, by rotating the
shutter speed ring
by
its black notched handles. A change in one means that
a simultaneous
compensating change is made
in
the other. For
example:
the
camera
may
be set for a combination of lens
opening 1/8 and 1/60 second. Suppose
this combination is not
suitable for your subject
because
you
need
a
fast-
er shutter speed such as 1/500 second for a sports shot.
In that case, turn
the
shutter speed
ring
from
1/60 to 1/500
second. This automatically
adjusts
the lens opening
to 1/2.8 and
thus compensates
for
the
faster
shutter speed
time.
On the other hand, if
you
intend to take
a
picture
which calls for good
depth of field,
*
for example,
needing
a
lens opening
such as
1/
16, you
must rotate the
shutter speed ring
in the
same
manner until the
figure 16
on the lens opening
scale
is
opposite
the
index
mark.
This changes
the
shutter speed
to
1/15 second. Such an exposure
should,
however,
only
be made with the camera on
a
firm
support, for
there is
risk of camera
movement
at exposure
times longer than
1/
30
second.
*Depth
of field
is
described
on page
17.
14
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