Piduretaldng-Wh
en 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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