Pentax 645 645 Manual - Page 32

Focusing, Procedure

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FOCUSING PROCEDURE View the subject through the viewfinder, and rotate the focusing ring of the lens. Focusing is possible in three ways; using split-image, microprism, and/or matte field. With the spl it-image method, the focusing ring should be rotated until the upper and lower image halves are perfectly aligned. When using the microprism collar, control focusing until glitter vanishes within the collar area. In the case of the matte surface, focusing should be adjusted until the image becomes sharp and crisp. At times, when the maximum aperture of the lens in use is limited in f/stop capability (less than f/5.6; example, f/8), the split-image or microprism collar may not render a satisfactory focusing view. In this event, the use of the matte field is recommended; or, an appropriate interchangeable focusing screen 645 (separately available) can be used. (Refer to P-62 for further details concerning this particular use.) Out of focus In focus 30

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FOCUSING
PROCEDURE
View
the
subject
through
the
viewfinder,
and
rotate
the
focusing
ring
of
the
lens.
Focusing
is
possible
in
three
ways;
using
split
-image,
microprism,
and/or
matte
field.
With
the
spl
it
-image
method,
the
focusing
ring
should
be
rotated
until
the
upper
and
lower
image
halves
are
perfectly
al
igned.
When
using
the
microprism
col
lar,
control
focusing
until
glitter
vanishes
within
the
collar
area.
In
the
case
of
the
matte
surface,
focusing
should
be
adjusted
until
the
image
becomes
sharp
and
crisp.
At
times,
when
the
maximum
aperture
of
the
lens
in
use
is
l
imited
in
f/stop
capabi
lity
(less
than
f/5.6;
example,
f/8),
the
spl
it
-image
or
microprism
collar
may
not
render
a
satisfactory
focusing
view.
In
this
event,
the
use
of
the
matte
field
is
recommended;
or,
an
appropriate
interchangeable
focusing
screen
645
(separately
available)
can
be
used.
(Refer
to
P-62
for
further
details
concerning
this
particular
use.)
Out
of
focus
In
focus
30