30
ADJUSTING
THE
FOCUS
-------------------------
Whi
le looking through the viewfinder,
if
the focus-
ing ring
is
turned either to the right or left
it
will,
make the blurred image
of
the subject become clear
and sharply focused .
•
The
focusing
is
very easy
as
the viewfinder shows
in its center a multi-microprism (collection
of
minute
prisms).
This
gives jagged edges to the image
as
soon
as
it
is
out
of
focus even in the slightest degree.
Light
is
collected to the focusing screen by means
of
a special system
of
fine-grained Fresnel lens and
condenser, which permits bright corner-to-corner
newlng.
Focu
sing for Infra-
Red Shots
For infra-red shoot-
ing, first set to Jccurate
focus in the normal
way,
then
shift
that
distance reading to
match the red
uR"
mark on the J perture
ring
of
the lens.
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