U.M. 3
Index
Pre
-
set
Aperture
Ring
A · M
Ring
Pre-
Set
Aperture
and
Checking
of
Depth-of-Field
Lens
with
A-M
Ring
1
Pre-
Setting
of
Aperture
: Set
the
A·M
ring
at
" A" .
Then
set
the
desired
F
stop
on
the
pre-set
aperture
ring
to
the
index. The
dia
·
phragm
will
close
down
to
the
pre-
set
F
stop
only
for
the
instant
that
the
shutter
is releas·
ed . Except
for
the
instant
that
the
shutter
is
released,
the
diaphragm
will
remain
fully
open.
2
Manually
Operated
Aperture
: When
the
A·M
ring
is
set
at
" M"
the
diaphragm
closes
down
to
the
pre-
set
F
stop
. In
this
way
the
depth
·
of.field
at
the
time
of
shutter
release can be
checked. When
the
A·M
ring
is
reset
at
" A"
the
diaphragm
again
returns
to
maximum
opening
.
14
Index
Pre
-
set
Aperture
Ring
Manual
Aperture
Ring
Lens
with
Manual
Apertur
e
Ring
1
Pre-
Setting
of
Aperture
: Set
the
desired
F
stop
on
the
pre-
set
aperture
ring
to
t he
index
.
Then
set
the
index
of
the
man
ual
aper
·
ture
ring
to
this
pre-set F
stop
. The
dia
·
phragm
will
close
down
to
the
pre-set F
stop
only
for
the
instant
that
the
shutter
is released.
2
Manually
Operated
Aperture
: When
the
manual
aperture
ring
is t urned in
the
direc
·
tion
of
closing
down
the
diaphragm,
after
setting
the
desired F
stop
on
the
pre-set
aperture
ring
to
the
index,
the
diaphragm
will close
down
to
the
pre-set F
stop
and
the
depth
-
of
.
fie
ld can
be checked. The
manual
aperture
ring
can·
not
be
turned
when
set
at
maximum
aperture
opening
.
• Refer
to
pages
34
.
35
concerning
depth
-
of
.
field
.
Relation Between the Mirror, Diaphragm, and Shutter
11:1
Th
e .shutter
is
clicked.
0
-0-0-0-
0
Press
the shutter
release
button
Th
e
di
aphragm
begins
to
close.
Closed
down
to
pre
-s
et
po
si
ti
on
.
The
diaphragm
beg
i
ns
to
open
.
Th
e diaphragm i.s fully
opened.
c9
r:9
c9
~
~
- - - \
•
Mirror
begins
to
sna
p
up.
Mirror is up. Mirror
beeins
to
return. Mi
rr
or retu
rns
to
former p
osi
t
io
n.
15