Operation Manual

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Infrared
(IR)
rays
(wavelengths
longer
than
800
nm) form
an
image
on
a
plane further
away
from
the
lens
than the image plane
for
visible light. To
compensate for
this difference
you have
to align
the chosen distance
against
the
red IR
index in-
stead of the normal lens
index. Proceed
as
follows:
l. Establish
the
distance to
the subject
either by
measuring
or by focusing
on the focusing
screen adapter
(see
page
9).
2, Note
the measured
distance
or mark
the dis-
tance point
on the focusing
scale
opposite
the
lens
index line.
3.
Adjust
the
focusing
ring
until
the established
distance point
is
opposite the red IR index.
The
built-in
shutter
in
the Biogon
CF
lens is fully
synchronized. A flash
connected
to the PC
ter-
minal fires
when
the shutter is fully
open.
The
PC
terminal has
a
rubber
bushing
that secures
the cable
connector. Always
push
the connector
all the
way
in!
Electronic flash
units can
be used at all shutter
speeds
(B
and I
s
-11500
s).
The very
short focal length
of the 38
mm Biogon
CF lens provides
both a 90o angle
and a
large
depth-of-field.
This
allows
successful use of the
hyper-focal
distance
setting
method.It
is
based on
the fact
that the sharply
defined area of a photo-
graphic
image
extends both in front
of and beyond
the
focusing
point
as described in
the section cov-
ering'Focusing
and depth-of-field'. The
distances
limiting
the sharply
defined areaare known
as the
'near
limit'and
the'far
limit'.
To
use the hyperfocal
distance
setting
method,
first
determine
the
EV-setting
and then select
the slow-
est
applicable
shutter speed.
This
will
give you the
smallest possible
aperture,
and therefore the larg-
est
depth-of-field. Rotate
the
focusing
ring
so that
the infinity
mark is
set to the
far
limit, i.e.
oppo-
site the selected
aperture number
to the
right
of
the lens index.
Now you
can
read
the near limit
distance opposite
the aperture number
to the left
of the
lens
index.
Using this method
you will get
an
image
that
is
sharp from
the
near limit
to in-
finity.
Example:
The
measured EV is
13. The
selected
shutter
speed
is
1/60
s.
This results
in
an aperture
value of fll l. By
setting
the
infinity
mark
at
flLL
on
the
far limit,
the
near limit
will land
at a dis-
tance
of
t
.2
m
(4
ft.).
At the
widest apertur
e
(fla.s)
the
near limit is
3 m
(
I 0 ft.
)
and at the
smallest apertu re
(f122)
the near
limit is
as close
as 0.65 m
(26
in.).
The magazine
may
be
loaded
on or off the cam-
era. If it is
to
be
loaded
off the camera, then
the
magazine
slide must
be inserted, its flat
side
7Magazine
Operation
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