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Pentax 645 User Manual

Pentax 645
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INTERCHANGEABLE
FOCUSING
SCREENS
UC-21
Split-image
Microprism
Matte
•
The
UC-21
focusing
screen
is
buiit-in
standard
focusing
device
for
general
use;
the
split
image
covers
an
area
of
3.5
mm
in
diameter,
while
the
microprism
area
is
8mm
in
diameter,
including
a
prism
angle
of
6®.
UA-21
Microprism
Matte
•
For
general
use,
with
a
microprism
area
of
8
mm
in
diameter,
and
prism
angle
of
6®.
UB-21
Split
Image
Matte
•
General
purpose
screen
possessing
a
prism
angle
of
6°.
When
combined
with
a
lens
with
a
maximum
aperture
smaller
than
f/6.6,
the
plain
matte
area
is
utilized
for
focusing.
UE-20
Plain
Matte
•
All
the
screen
surface
except
for
the
central
spot
(11mm
diameter)
is
covered
by
the
fresnel
lens,
and
has
been
designed
for
the
slower
speed
lenses
with
a
maximum
aperture
smaller
than
f/5.6:
situations
under
which
microprism
and
split-Image
areas
are
not
clearly
defined
in
focusing.
r
j
~>G20r
UG-20
Section-line
Matte
•
A
variation
of
the
UE-20
plain
matte
screen;
it
includes
sectional
lines.
Intervals
of
both
vertical
and
horizontal
lines
are
9mm.
It
is
suited
particularly
for
the
precise
composing
of
a
subject
or
for
checking
vertical
or
horizontal
lines.
63

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Pentax 645 Specifications

General IconGeneral
BrandPentax
Model645
CategoryDigital Camera
LanguageEnglish

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