ROLLEIFLEX SL 2000F - Page 56

ffi
ff
#
Depth
Of freld
Even
the
best
of
lenses
can
only reproduce
absolute
sharpness
on
objects
situated
on
onefocal
plane.
Any-
thing
lying
outside
the
limits
of
thisfocal
planewill
be
out
offocus
(fi4.
55
and
56). With
stop-down
metering
the
photographer
can
then
get
the
areas
infront
of and
behind
thisfocal
plane
infull
focus.
This'depth
offield"
extendsfrom
approximately
one third
of the
distance
in
front
of
thefocal
plane
to two
thirds
behind
it. It
is deter-
mined
by the
position
of the
photographer
and his
selectedfocal
length
and
aperture
setting.The
more
one
opens
the
aperture,
e.g.f 1.4,
the
less
scope
there
isfor
depth
offield;
the
more
one closes
the
aperture,for
instance
down
tof
II,
then
the
depth
offield
range
be-
cgmes
largerThis
effect
can be
intentionally
used
to
pro-
duce
more
creative
photography.
Portrait
photography,
for
example,
can
bevery
effectivewith
a blurred
bick-
ground
whilst
using
a highf
numberfor
an
opened-up
aperture;whereas
the
blurred
effect
disappears
once
the
photographer
closes
down
the
aperture.
The
depth
ofJietd
table
shows
you
the
possibilities
with
each Rollei
lens.
By
using
the
stop-down
buttonforworking
aperture
metering,
you
can comfortably
assess
the
depth
offield
through
the
SL 2000
FviewJinder
before
shooting
the
picture.
Aher Fuctors
Affectiny
Image
Sharpness
A blurred
picture
can
also resultfrom
theJilm
material
that
has
been
used. A
highly
sensitive 27
DII{film,for
instance
which
has
perhaps
been
"overstrained"
to above
30
DIN,
will never
reach
thefocusing
quatity
that
a
medium
or
less
sensitivefilmwould.This
applies
to
both
black
and
white
and
colourJilms.
The
outside
atmosphere
can
also have
a strong
influence
on
photography,
sometimes
resulting
in
relatively
blurred,
but above
all dull
pictures
without
contrast.When
the
heat
of the
day causes
the
air to
"flicker",
which
can
often
be
seen
quite
clearly
on
road
surfaces,
then this
also
happens
where
it
is not
perceptible
to the
human
eye; it
can occur
in
the open
countryside,
especially
when
work-
i ng
w i t h
I o ng
fo
ca
I d i s t
an c es. Th
e
uns u
cces sfu
I
p
ho t
o-
graphs (visual
range)
are
neither
due
to the
camera,
nor
to the
lenses.The
same
applies
to haze
in the
atmosphere
which
is
hardly
noticeable
to the
qte;
likewise,
tobacco
smoke
in
bars
or halls
causes
"dull"
pictures.
Finally,
even the
best Zeiss
lenses
on the Rolleiflex
SL
2000
F
cannot
work wonders
if the/ilm
has
become
grained
and blurred
due
to
incorrect
developing.
51