Pentax ME-F ME-F Manual - Page 22

underexposure

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125% X B. • 121ti • 18 APERTURE SETTING Preselection of the lens aperture is optional when shooting in the "M" (Manual) mode. However, when shooting on "AUTO", it is recommended that you preset the aperture. This is because the shutter speed selected by the automatic exposure system is determined in relation to the lens aperture used. By presetting the aperture control ring to an f-number that is appropriate for lighting conditions in the picture, problems of over and underexposure can be largely eliminated. When shooting on "AUTO" (or Manual when applicable), preset the lens aperture as suggested in the following table. Fine weather Cloudy weather Indoors f/8 - f/11 f/4 - f/5.6 f/1.4 - f/2.8 To set aperture: The calibrations on the aperture control ring of the lens are referred to as f-numbers or f-stops and denote the size of the lens aperture. To set the aperture, align the figure equivalent to the recommended f-number with the diamond index mark. Note on f-numbers: Lower f/numbers (such as f/1.4) denote wider lens apertures, while higher-f-numbers (such as f/22) denote smaller apertures. With the 50mm f/1.4 lens, for example, f/1.4 is the widest, aperture or "open-aperture," while f/22 is the smallest aperture or "minimum aperture." As the size of the aperture also affects the overall sharpness of the photo, you may occasionally wish to vary the aperture setting from the norm for different effects (See page 54).

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APERTURE
SETTING
125%
X
B.
121ti
•
•
18
Preselection
of
the
lens
aperture
is
optional
when
shooting
in
the
"M"
(Manual)
mode.
However,
when
shooting
on
"AUTO",
it
is
recom-
mended
that
you
preset
the
aperture.
This
is
because
the
shutter
speed
selected
by
the
automatic
exposure
system
is
determined
in
relation
to
the
lens
aperture
used.
By
presetting
the
aperture
control
ring
to
an
f-number
that
is
appropriate
for
lighting
conditions
in
the
picture,
problems
of
over
and
underexposure
can
be
largely
eliminated.
When
shooting
on
"AUTO"
(or
Manual
when
applicable),
preset
the
lens
aperture
as
suggested
in
the
following
table.
Fine
weather
f/8
—
f/11
Cloudy
weather
f/4
-
f/5.6
Indoors
f/1.4
-
f/2.8
To
set
aperture:
The
calibrations
on
the
aperture
control
ring
of
the
lens
are
referred
to
as
f-numbers
or
f-stops
and
denote
the
size
of
the
lens
aperture.
To
set
the
aperture,
align
the
figure
equivalent
to
the
recommended
f-number
with
the
diamond
index
mark.
Note
on
f-numbers:
Lower
f/numbers
(such
as
f/1.4)
denote
wider
lens
apertures,
while
higher
-f-numbers
(such
as
f/22)
denote
smaller
apertures.
With
the
50mm
f/1
.4
lens,
for
example,
f/1.4
is
the
widest,
aperture
or
"open
-aperture,"
while
f/22
is
the
smallest
aperture
or
"minimum
aperture."
As
the
size
of
the
aperture
also
affects
the
overall
sharpness
of
the
photo,
you
may
occasionally
wish
to
vary
the
aperture
setting
from
the
norm
for
different
effects
(See
page
54).