Eye
Correction
Lens
This lens, designed
to
correct
visibility
, is installed
inside
the
eyepiece ring
of
the
Porrofinder, CdS Por-
rofinder,
or
Prism Finder.
The image in
the
finder coincides
with
persons
with
ordinary eyesight who easily visualize objects
without
becoming fatigued. Persons who do
not
wear glasses
in
spite
of
their
nearsightedness
or
farsightedness,
or
whose
sight
is
not
suffi
ciently corrected
by
glasses,
usually
find
it
very
difficult
to
observe
the
finder image.
Such
person~
may
find
this
lens a boon
to
facilitating
picture
tak
ing.
Nine types
of
lenses are provided
from
+
2.5
to
- 2
diopter
(each
diopter
is +
2.5,
+
2.0,
+
1.5,
+
1.0,
+
0.5,
-
0.5,
-
1.0,
-
1.5,
and
-2.0
).
The
diopter
has no relation
to
values such
as
1.0
in
a
test
of
visual power, and cannot
be
converted
to
other
values; therefore, have
an
optician determine
the
diopter
suitable
to
your glasses.
Supposing
that
your
glasses were +
1.5
diopter,
it
would be very easy
to
view
the
finder image when
using a lens having
+
1.5
diopter. Of course,
if
the
individual wears glasses perfectly
fitted
to
his eyes,
this
accessory lens is unnecessary.
When installing
the
lens on
the
f inder, hold
the
milled
portion
of
the
eyepiece
ring
with
the
thumb
and finger, and
turn
it
counterclockwise
to
remove
the
ring. When
the
lens is a plus (convex) lens,
position
it
with
the
flat
surface outside, and when
it
is a
minus
(concave) lens, place
the
concave
surf
a
ce
on
the
ex-
terior, then screw
the
ring
into
its
original position.
Magnifying
Hood
This magnifying hood may
be used instead
of
the
focus-
ing
hood. By
turning
the
knob
on
the
side
of
this
hood, either
3.5X
or
6X
magnification can
be selected.
Magnifier
A very convenient accessory
for
accurate focusing,
this
magnifying
glass, used by at-
taching
it
to
the
side plates
of
the
focusing hood
from
above, magnifies
the
pictUre on
the
ground glass focusing
screen
5.5
times.
By
turn
i
ng
the
eye lens
ring
of
the
magni-
fier
,
visibility
can
be
adjusted.
28
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