Exposure
determination
The amount of light reaching the film plane
is
determined by a
combination of the shutter speed and the lens aperture. A
shutter speed of
1/500 sec. lets
in
twice as much light as a set-
ting of 1/1000 sec
.,
and only half as much light as 1/250 sec.
An
aperture setting of
1111
lets
in
twice as much light as
1116,
half as
much
as
118.
Thus, if the correct exposure for a particular
picture-taking situation
is
1/500 at
1111,
then 1/250 at
1116
or
111000
at
118
will give the same exposure. It
is
very convenient
to know this interrelation when considering depth of field. The
following table illustrates the interrelation between shutter
speed and aperture.
1/4000
112000
1/1000 1/500 1/250
4 5.6 8
11
16
Exposure
display
The
LED
exposure indicator lamps can
be
seen
on
the right side
of the viewfield frame within the viewfinder. The shutter speed
number and IInumber
in
use are also visible. The
LED
exposure
display indicates exposure five ways, as shown
in
the table
below,
in
accordance with the conditions of each exposure.
Overexposure by more than 1 stop
Overexposure by
1/5
to 1 stop
Correct exposure
Underexposure by
1/5
to
1 stop
Underexposure by more than 1 stop
As correct exposure
is
approached, the
LED
exposure display
inside the viewfinder
is
liable to change rapidly and easily within
the very narrow range, so it
is
important to turn the lens aper-
ture ring and shutter speed dial carefully. Although intermediate
shutter speeds cannot
be
used, intermediate lens apertures
can-just
turn the aperture ring for fine adjustment.
Note: When the shutter speed dial
is
set at B (bulb), the
LEO
exposure
display inside the viewfinder is turned off.
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