Pentax KX KX Manual - Page 25

Range, Light, Measurement

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RANGE OF LIGHT MEASUREMENT The exposure meter of the KX measures the brightness of the ground glass. Therefore, the meter needles should be matched 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 sec. to 1/1000 sec. in combination with any aperture that will match the two needles in the viewfinder. The total range of 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 sec. to 1/1000 sec. 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. •23 1.4 2 2.8 4 5.6 8 11 16 22 1 2 1 4 15 30 A 60 1 125 250 1 500 1 1000

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RANGE
OF
LIGHT
MEASUREMENT
The
exposure
meter
of
the
KX
measures
the
brightness
of
the
ground
glass.
Therefore,
the
meter
needles
should
be
matched
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
sec.
to
1/1000
sec.
in
combination
with
any
aperture
that
will
match
the
two
needles
in
the
viewfinder.
The
total
range
of
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
sec.
to
1/1000
sec.
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.
•23
1.4
2
2.8
4
5.6
8
11
16
22
1
2
1
4
15
30
A
60
1
125
250
1
500
1
1000