<s>
The	O
Contarex	B-Algorithm
is	O
a	O
35mm	O
SLR	B-Algorithm
camera	I-Algorithm
made	O
by	O
Zeiss	O
Ikon	O
.	O
</s>
<s>
It	O
is	O
popularly	O
known	O
as	O
the	O
Contarex	B-Algorithm
I	O
,	O
the	O
Bullseye	O
or	O
the	O
Cyclops	O
.	O
</s>
<s>
However	O
,	O
it	O
is	O
rugged	O
and	O
roller	O
bearings	O
are	O
used	O
in	O
the	O
aperture	B-General_Concept
mechanism	O
.	O
</s>
<s>
The	O
Contarex	B-Algorithm
was	O
the	O
first	O
35mm	O
SLR	B-Algorithm
focal	O
plane	O
shutter	O
camera	O
providing	O
direct	O
meter	O
coupling	O
to	O
the	O
shutter-	O
,	O
aperture-	O
,	O
and	O
film	O
speed-settings	O
;	O
they	O
are	O
interconnected	O
by	O
cords	O
.	O
</s>
<s>
An	O
aperture	B-General_Concept
simulator	O
for	O
the	O
exposure	O
meter	O
in	O
the	O
Cyclops	O
window	O
uses	O
an	O
iris	O
in	O
front	O
of	O
the	O
selenium	O
meter	O
cell	O
.	O
</s>
<s>
A	O
thumb-wheel	O
on	O
the	O
camera	O
controls	O
the	O
lens	O
aperture	B-General_Concept
,	O
and	O
the	O
value	O
is	O
shown	O
in	O
a	O
window	O
on	O
top	O
of	O
the	O
centrally	O
located	O
meter	O
cell	O
(	O
the	O
Cyclops	O
window	O
)	O
.	O
</s>
<s>
The	O
aperture	B-General_Concept
in	O
the	O
interchangeable	O
automatic	O
lens	O
closes	O
when	O
the	O
shutter	O
release	O
is	O
depressed	O
and	O
reopens	O
when	O
the	O
camera	O
is	O
wound	O
on	O
for	O
the	O
next	O
exposure	O
.	O
</s>
<s>
Due	O
to	O
the	O
limited	O
meter	O
range	O
,	O
not	O
every	O
camera	O
setting	O
combination	O
is	O
possible	O
to	O
accommodate	O
on	O
the	O
Contarex	B-Algorithm
I	O
exposure	O
meter	O
.	O
</s>
<s>
A	O
custom	O
modified	O
Contarex	B-Algorithm
was	O
used	O
by	O
astronaut	O
Ed	O
White	O
during	O
the	O
first	O
NASA	O
extra	O
vehicular	O
activity	O
(	O
EVA	O
)	O
on	O
June	O
3	O
,	O
1965	O
,	O
during	O
the	O
flight	O
of	O
Gemini	O
4	O
.	O
</s>
<s>
There	O
is	O
no	O
aperture	B-General_Concept
ring	O
on	O
the	O
Contarex	B-Algorithm
lens	O
itself	O
.	O
</s>
<s>
It	O
is	O
set	O
on	O
the	O
camera	O
aperture	B-General_Concept
wheel	O
.	O
</s>
<s>
The	O
Contarex	B-Algorithm
lens	B-Algorithm
mount	I-Algorithm
takes	O
only	O
Contarex	B-Algorithm
lenses	O
and	O
accessories	O
.	O
</s>
