Pentax 645 645 Manual - Page 38

photography.

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APERTURE-PRIORITY AE MODE 1 I • • • [ L ' J Aperture-priority AE Predetermine the f/stop to meet with a given photographic situation; the shutter speed will automatically adjust itself and provide the proper exposure in line with the subject's brightness. This method is ideally suited whenever the depth-of-field is considered important in general or portrait photography. 1. In this mode, the "Auto" and f/stop are externally displayed in the LCD window. Whenever a mode is switched from another to this particular setting, the display can be made visual by depressing the selecting button (either "up" or "down") and the mode button 36 simultaneously. 2. Desired selection of the f/stop can be effected with the depressing of the "up" or "down" selecting button. The "up" button should be operated when the aperture choice is toward the minimum aperture (example, f/22); the "down" button, when the aperture desired is toward the maximum aperture opening (f/2.8, etc.). A single depressing moves the value in 1/2 incremental stops, while continuous f/stop increments are possible by maintaining pressure upon the selecting button.

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APERTURE
-PRIORITY
AE
MODE
1
I
[
'
J
•
•
•
Aperture
-priority
AE
Predetermine
the
f/stop
to
meet
with
a
given
photographic
situation;
the
shutter
speed
will
automatically
adjust
itself
and
provide
the
proper
exposure
in
line
with
the
subject's
brightness.
This
method
is
ideally
suited
whenever
the
depth
-of
-field
is
considered
important
in
general
or
portrait
photography.
1.
In
this
mode,
the
"Auto"
and
f/stop
are
externally
displayed
in
the
LCD
window.
Whenever
a
mode
is
switched
from
another
to
this
particular
setting,
the
display
can
be
made
visual
by
depressing
the
selecting
button
(either
"up"
or
"down")
and
the
mode
button
L
simultaneously.
2.
Desired
selection
of
the
f/stop
can
be
effected
with
the
depressing
of
the
"up"
or
"down"
selecting
button.
The
"up"
button
should
be
operated
when
the
aperture
choice
is
toward
the
minimum
aperture
(example,
f/22);
the
"down"
button,
when
the
aperture
desired
is
toward
the
maximum
aperture
opening
(f/2.8,
etc.).
A
single
depressing
moves
the
value
in
1/2
incremental
stops,
while
continuous
f/stop
increments
are
possible
by
maintaining
pressure
upon
the
selecting
button.
36