•
•
•
-
with
ftko".tl
kngfll.'
or
J
1-1
l11i11imdcrs_
Al
f/ttt(
j
Ih~
~olor
~t!in.&).
!I\l' hypcrllH.:al
tlisl;lnc,,-"
i the
n
...
'
..
r
Hntit
of
the
sharp
fi~h.I
when
tht! c.lmer.i is
-
foeusa]
10
INFlNITY\
i~
42
ih:L
At
f;42
Uh~
bl'll:k and
whit~
st'llingi.
{he hypt'rfocal distan\.'e
tlrops
to
Mfect.
The
di3gonal fieW
of
view is
55<>.
-
while tilt'
anguJ<lf
field
(;]t
INFINITY)
is
36<1
X
4t," .
RANGEFINDERS/VIEWFINDERS
-
111t'rc are
Ihrt~c
types
of
f.lIlgellnders/v1t'wfindefS
llscd in Polaroid
Land
aU[om;.atil: pack
cameras.
-
The first.
is
a relatively simple image
slZ!!r
which
frames the subject and provides a scale for
cstj~
mation
of
distance between e:.lmera and subject.
The
second model
is
a true
rangdinderJview~
nnder
which
focuses
by
superimposing
two
images
of
thl;' subject,
Separate
windows
are
pro~
vided for the focusing and
fmming
functions. The
-
-
third
type
js
the
Zeiss Ikon model which also
focuses
by
superimposing
two
images.
However.
both
the focusing
and
framing images are viewed
-
through a single
window.
Image Sizer
-
The
jma.ge sizer is used
on
the
Model 104, 125.
115.
210,and
315 cameras. figure
2-7
shows the
internal construction
of
the image sizer.
-
-
INCIOENT
LIGHT
-
GLASS
-
MASK
ASSEMeL'I'
_""",-
-
MASK
-
-
MIRROR
T!J~
_'.;ubJt',:t
is
rroj~dl:l1lO
lIn:·
cyt' km. through
Ill
....
Irallsluc-t.'nt
lIi~hmk
mirror.
IA~
tbt"d
In
Polaroid c;lInt!ras:. a t1khmit"
nmror
can
bl:
dc-
tinetJ as
an
optil:
t1cvio."1:
whkh
rdl",·\:l:o.
an
im.,g~"
impJrting
10
it
a \:\.:rtOlin
color
dlarJct;..>ristit;. while
it allows
another
imllg;t'
to
pas.,
..
through
it
ill
ib
natural
",olon
•.
For
example.
Figure
2·7
show~
incident
light
being
rcOt't'lt'd
off
one
side
of
[h
....
dh.::hmit:
mirror
before
it
rt'Jt;hes
the
eye. Thl!
inddent
light
hikes:
on
tht!
t"olor
of
Ih
....
mirror
either
purple
or
amber.
At
the
lklnll.!
liml.!.lhl.'
scene light passes
through
the
mirror
10
till.!
eye
in
its
natural
colors.
In this
way.
Albada lines
framing
th~
subject
c.m
be
contrasted against
natural
scen~
light.)
When
vi~wed.
the
subjet't is
outlined
by a
(r"me
of
small diamonds.
Th~
diamonds
are
the
result
of
!nddent light shining
through
the
mask
ass~mbly
{whit:h forms the
diamonds) lind then
reOecting
off
(he metl'll
mirror
and
the
colored side
of
(he
dichroic
mirror.
The
distance scale.
fixed
horizontal
line.
and
movable
arrow
are
brought
to
the eye
I~ns
in the
same
way.
As
the camera
is
focused. the mask assembly
moves in such a
manner
tha t the area
el1com~
passed by the
diamonds
is
either
enlarged
or
re~
duced. In coincidence
with
this.
the
arrow moves
~
_____
SUBJECT
\
\
--===\;!!;===::>-
___
IMAGESIZER
L
t-
WINDOW
I
=::r-----Eve
LENS
•
~
~FIXEOLINE
=DISTANCE
____
....
~
SCALE
.'
•
MOVA8t£
S
ARROW
-
•
.
•
\
FIG. 2.7
IMAGE
SIZER INTERNAL CONFIGURATION
5
To Next Page
Loading...
Need help?
General
