Pentax SF-1 SF-1 Manual - Page 43

Shutter-Speed/Aperture

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Programmed AE Diagram This camera has three Programmed AE modes - Normal Program, Program Action and Program Depth. The thick solid lines of the diagram at left represent the shift in the combination of shutter speeds and apertures. This combination can be shifted up to the maximum aperture of the lens in use: the combination of an f/2.8 lens is indicated by a red dotted line as an example. In the Normal Program mode, the combination is automatically shifted to a program for one of three sub-modes - Wide, Standard and Tele - depending on the lens in use. The Program Action mode is programmed to select a high shutter speed. The Program Depth mode is programmed to increase the depth of field by selecting a small aperture. The thin solid lines and thin dotted lines on both sides of the diagram indicate different coupling ranges when lenses with different maximum and minimum apertures are used, or when the ISO film speed is changed. As the aperture range of the lens (f/1.4 - f /22) changes, the limits of the metering range change as well. Metering Range and Shutter-Speed/Aperture Coupling Range Metering range refers to the range of subject illumination within which the built-in exposure meter can operate to control an exposure. The shutter-speed/aperture coupling range is a part of the metering range within which possible combinations of shutter-speed and aperture values for proper exposure control can be found. For example, the metering range for a 50mm f/1.4 standard lens with ISO 100 film is from EV 1 (f/1.4, 1 sec.) to EV 20 (f/22, 1/2000 sec.). As the ISO film speed changes, the metering range changes as well. The thin slanted red lines in the diagram at left indicate the change in metering ranges in relation to ISO film speed. The inside of the center frame represents the meter and shutter-speed/aperture coupling range. EV (Exposure Value) EV represents the brightness of the subject and is indicated by a number. 39e

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Programmed
AE
Diagram
This
camera
has
three
Programmed
AE
modes
—
Normal
Program,
Program
Action
and
Program
Depth.
The
thick
solid
lines
of
the
diagram
at
left
represent
the
shift
in
the
combination
of
shutter
speeds
and
apertures.
This
combination
can
be
shifted
up
to
the
maximum
aperture
of
the
lens
in
use:
the
combination
of
an
f/2.8
lens
is
indicated
by
a
red
dotted
line
as
an
example.
In
the
Normal
Program
mode,
the
combination
is
automatically
shifted
to
a
program
for
one
of
three
sub
-modes
—
Wide,
Standard
and
Tele
—
depending
on
the
lens
in
use.
The
Program
Action
mode
is
programmed
to
select
a
high
shutter
speed.
The
Program
Depth
mode
is
programmed
to
increase
the
depth
of
field
by
selecting
a
small
aperture.
The
thin
solid
lines
and
thin
dotted
lines
on
both
sides
of
the
diagram
indicate
different
coupling
ranges
when
lenses
with
different
maximum
and
minimum
apertures
are
used,
or
when
the
ISO
film
speed
is
changed.
As
the
aperture
range
of
the
lens
(f/1.4
—
f
/22)
changes,
the
limits
of
the
metering
range
change
as
well.
Metering
Range
and
Shutter-Speed/Aperture
Coupling
Range
Metering
range
refers
to
the
range
of
subject
illumination
within
which
the
built-in
exposure
meter
can
operate
to
control
an
exposure.
The
shutter-speed/aperture
coupling
range
is
a
part
of
the
metering
range
within
which
possible
combinations
of
shutter
-speed
and
aperture
values
for
proper
exposure
control
can
be
found.
For
example,
the
metering
range
for
a
50mm
f/1.4
standard
lens
with
ISO
100
film
is
from
EV
1
(f/1.4,
1
sec.)
to
EV
20
(f/22,
1/2000
sec.).
As
the
ISO
film
speed
changes,
the
metering
range
changes
as
well.
The
thin
slanted
red
lines
in
the
diagram
at
left
indicate
the
change
in
metering
ranges
in
relation
to
ISO
film
speed.
The
inside
of
the
center
frame
represents
the
meter
and
shutter-speed/aperture
coupling
range.
EV
(Exposure
Value)
EV
represents
the
brightness
of
the
subject
and
is
indicated
by
a
number.
39e