Pentax KM KM Manual - Page 28

Range, Light, Measurement

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RANGE OF LIGHT MEASUREMENT The exposure meter of the KM measures the brightness of the ground glass. Therefore, the meter needle should be centered after you have focused your subject on the ground glass. The area (A) in the table indicates the reading range of the meter, and should not be interpreted as the camera's total range of f/stop-shutter speed combinations. As you will note from the table, with an ASA 100 film, you may use any shutter speed from 1/4 sec. to 1/1000 sec. in combination with any aperture that will bring the meter needle to the midpoint in the viewfinder. The total range of the aperture settings is, of course, determined by the minimum and maximum apertures of the lens being used. For example, with the 50mm f/1.4 lens and ASA 100 film, any aperture from f/1.4 (the maximum aperture of this lens) to f/16 may be used with any shutter speed from 1/4 sec. to 1/1000 sec. that will bring the meter needle to midpoint. However, the combination of f/22 (minimum aperture) and 1/1000 sec. is beyond the measurability range (B), as shown in the table. As the ASA film speed changes, the measurability range varies. f N t4 2 2.8 4 5.6 8 11 16 22 1 B 1 2 1 4 1 1 1 15 1 30 A 1 60 1 123 1 1 1 1000 B 26 •

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RANGE
OF
LIGHT
MEASUREMENT
The
exposure
meter
of
the
KM
measures
the
brightness
of
the
ground
glass.
Therefore,
the
meter
needle
should
be
centered
after
you
have
focused
your
subject
on
the
ground
glass.
The
area
(A)
in
the
table
indicates
the
reading
range
of
the
meter,
and
should
not
be
interpreted
as
the
camera's
total
range
of
f/stop-shutter
speed
combinations.
As
you
will
note
from
the
table,
with
an
ASA
100
film,
you
may
use
any
shutter
speed
from
1/4
sec.
to
1/1000
sec.
in
combination
with
any
aperture
that
will
bring
the
meter
needle
to
the
midpoint
in
the
viewfinder.
The
total
range
of
the
aperture
settings
is,
of
course,
determined
by
the
minimum
and
maximum
apertures
of
the
lens
being
used.
For
example,
with
the
50mm
f/1.4
lens
and
ASA
100
film,
any
aperture
from
f/1.4
(the
maximum
aperture
of
this
lens)
to
f/16
may
be
used
with
any
shutter
speed
from
1/4
sec.
to
1/1000
sec.
that
will
bring
the
meter
needle
to
midpoint.
However,
the
combination
of
f/22
(minimum
aperture)
and
1/1000
sec.
is
beyond
the
measurability
range
(B),
as
shown
in
the
table.
As
the
ASA
film
speed
changes,
the
measurability
range
varies.
f
N
t4
2
2.8
4
5.6
8
11
16
22
1
B
1
2
1
4
1
1
1
15
1
30
A
1
60
1
123
1
1
1
1000
B
26
•