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Olympus Pen FT - Focusing Aids and Depth of Field; Pre-view Button Functionality; Interpreting Depth of Focus Scale

Olympus Pen FT
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7 Pre-view button "
- (to verify Fj
stop
selection):
~~=====
The
unmarked
button
on
the
base
of
the
lens
is
called
the
"
Pre·view
button"
. Even
after
the
F/
stop
on
the
Pen
FT
is
set,
it
will
not
close
down
to
this
opening
unless
the
shutter
release
button
is
pressed
.
At
all
other
times
the
lens
diaphragm
is
wide
open.
This
fully
automatic
diaphragm
system
allows
focusing
and
framing
at
full
brightness
.
The
pre·view
button
on
the
Pen FT
closes
the
pre·set
opening,
making
it
possible
to
see
the
subject
through
the
viewfinder
with
the
same
brightness
as
that
of
the
F/
stop
setting.
(See
section
8 &
11,
Depth
of
Focus
& Dis-
tance
Scale.)
This
ensures
perfect
focusi
ng
of
both
subject
and
background
.
8
Reading the depth
of focus scale:
--
The
depth
of
focus
is in-
dicated
by
a
set
numbers
;
4,
8
and
16
;
which
corres
-
pond
to
lens
openings
and
are
written
on
each
side
of
the
red
mark
(6
)-
Reading
the
depth
of
focus
is
ex
-
plained
by
the
following
ex
-
ample
:
The
distance
be-
tween
the
camera
and
the
subject
is 3
meters
and
the
F/
stop
setting
is
16
.
Depth
of
focus
is
i nd
icated
be-
tween
16
to
the
left
of
the
mark
(1.5
m)
and
16
to
the
right
of
the
mark
(co)
The
focused
range
can
also
be
determined
by
pressing
the
pre-view
button
while
viewing
through
the
finder
,
as
explained
in
Section
7.

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