<s>
The	O
Contaflex	B-Algorithm
series	O
is	O
a	O
family	O
of	O
35mm	O
leaf-shuttered	O
SLR	B-Algorithm
cameras	I-Algorithm
,	O
produced	O
by	O
Zeiss	O
Ikon	O
in	O
the	O
1950s	O
and	O
1960s	O
.	O
</s>
<s>
The	O
name	O
was	O
first	O
used	O
in	O
1935	O
on	O
a	O
35mm	O
Twin-lens	B-Algorithm
reflex	I-Algorithm
camera	I-Algorithm
,	O
the	O
Contaflex	B-Algorithm
TLR	O
also	O
by	O
Zeiss	O
Ikon	O
,	O
the	O
-flex	O
part	O
in	O
the	O
name	O
referring	O
to	O
integral	O
mirror	O
for	O
the	O
viewfinder	O
.	O
</s>
<s>
The	O
first	O
models	O
,	O
the	O
Contaflex	B-Algorithm
I	O
and	O
II	O
have	O
fixed	O
lenses	O
,	O
while	O
the	O
later	O
models	O
have	O
interchangeable	O
lenses	O
,	O
and	O
eventually	O
the	O
Contaflexes	B-Algorithm
became	O
a	O
camera	O
system	O
with	O
a	O
wide	O
variety	O
of	O
accessories	O
.	O
</s>
<s>
The	O
first	O
Contaflex	B-Algorithm
SLR	I-Algorithm
was	O
introduced	O
in	O
1953	O
as	O
one	O
of	O
the	O
earliest	O
35mm	O
SLR	B-Algorithm
cameras	I-Algorithm
equipped	O
with	O
a	O
leaf	O
shutter	O
,	O
but	O
with	O
a	O
fixed	O
lens	O
.	O
</s>
<s>
The	O
Mecaflex	B-Algorithm
was	O
presented	O
at	O
photokina	O
in	O
1951	O
and	O
launched	O
two	O
years	O
later	O
with	O
a	O
leaf	O
shutter	O
behind	O
the	O
removable	O
lens	O
,	O
while	O
the	O
Hasselblad	O
500C	O
of	O
1957	O
has	O
a	O
leaf	O
shutter	O
in	O
its	O
interchangeable	O
lens	O
.	O
</s>
<s>
This	O
design	O
,	O
using	O
a	O
leaf	O
shutter	O
in	O
an	O
SLR	B-Algorithm
,	O
involves	O
a	O
complex	O
sequence	O
of	O
events	O
when	O
the	O
shutter	O
is	O
released	O
,	O
more	O
looked	O
upon	O
as	O
a	O
challenge	O
than	O
a	O
drawback	O
at	O
Zeiss	O
Ikon	O
,	O
but	O
no	O
Contaflex	B-Algorithm
model	O
ever	O
got	O
a	O
rapid	O
return	O
mirror	O
.	O
</s>
<s>
Three	O
years	O
later	O
,	O
during	O
1956	O
,	O
the	O
Kodak	B-Algorithm
Retina	I-Algorithm
Reflex	I-Algorithm
was	O
launched	O
,	O
followed	O
by	O
the	O
Voigtländer	B-Algorithm
Bessamatic	I-Algorithm
and	O
the	O
Ultramatic	B-Algorithm
.	O
</s>
<s>
The	O
market	O
soon	O
flourished	O
with	O
leaf-shuttered	O
SLR	B-Algorithm
cameras	I-Algorithm
.	O
</s>
<s>
The	O
Contaflex	B-Algorithm
I	O
,	O
launched	O
in	O
1953	O
,	O
was	O
equipped	O
with	O
a	O
fixed	O
Zeiss	O
Tessar	O
45mm	O
f:2.8	O
lens	O
with	O
front-cell	O
focusing	O
.	O
</s>
<s>
The	O
very	O
first	O
Contaflex	B-Algorithm
I	O
had	O
a	O
Synchro-Compur	O
shutter	O
with	O
the	O
old	O
scale	O
of	O
shutter	O
speeds	O
(	O
1-2-5-10-25-50-100-250-500	O
)	O
,	O
but	O
very	O
soon	O
it	O
adopted	O
the	O
new	O
scale	O
1-2-4-8-15-30-60-125-250-500	O
.	O
</s>
<s>
The	O
Contaflex	B-Algorithm
II	O
,	O
introduced	O
the	O
following	O
year	O
,	O
was	O
the	O
same	O
camera	O
with	O
an	O
uncoupled	O
selenium	O
meter	O
added	O
to	O
one	O
side	O
of	O
the	O
front	O
plate	O
.	O
</s>
<s>
The	O
Contaflex	B-Algorithm
III	O
,	O
launched	O
in	O
1956	O
,	O
was	O
the	O
same	O
as	O
the	O
I	O
,	O
but	O
equipped	O
with	O
a	O
Zeiss	O
Tessar	O
50mm	O
f:2.8	O
with	O
helical	O
focusing	O
.	O
</s>
<s>
The	O
front	O
element	O
of	O
the	O
lens	O
was	O
removable	O
and	O
could	O
be	O
replaced	O
by	O
supplementary	O
lenses	O
,	O
discussed	O
in	O
the	O
section	O
Contaflex	B-Algorithm
lenses	O
.	O
</s>
<s>
The	O
Contaflex	B-Algorithm
IV	O
,	O
introduced	O
the	O
same	O
year	O
,	O
was	O
the	O
same	O
camera	O
with	O
the	O
uncoupled	O
meter	O
inherited	O
from	O
the	O
Contaflex	B-Algorithm
II	O
.	O
</s>
<s>
The	O
Contaflex	B-Algorithm
Alpha	O
and	O
Contaflex	B-Algorithm
Beta	O
,	O
both	O
introduced	O
in	O
1957	O
,	O
were	O
based	O
on	O
the	O
same	O
body	O
but	O
equipped	O
with	O
a	O
Zeiss	O
Pantar	O
45mm	O
f:2.8	O
three-element	O
lens	O
and	O
a	O
Prontor	O
Reflex	O
shutter	O
up	O
to	O
1/300	O
.	O
</s>
<s>
The	O
Contaflex	B-Algorithm
Rapid	O
was	O
introduced	O
in	O
1958	O
and	O
had	O
a	O
slightly	O
longer	O
body	O
,	O
a	O
built-in	O
accessory	O
shoe	O
,	O
a	O
winding	O
lever	O
and	O
a	O
rewind	O
crank	O
.	O
</s>
<s>
The	O
Contaflex	B-Algorithm
Super	O
,	O
launched	O
the	O
following	O
year	O
,	O
was	O
based	O
on	O
the	O
Rapid	O
and	O
had	O
a	O
coupled	O
selenium	O
exposure	O
meter	O
on	O
the	O
front	O
side	O
of	O
the	O
prism	O
.	O
</s>
<s>
The	O
Contaflex	B-Algorithm
Prima	O
,	O
launched	O
in	O
1959	O
and	O
sold	O
until	O
1965	O
,	O
was	O
based	O
on	O
the	O
body	O
of	O
the	O
Rapid	O
,	O
but	O
with	O
the	O
Pantar	O
lenses	O
and	O
the	O
Prontor	O
shutter	O
like	O
the	O
Alpha	O
and	O
Beta	O
.	O
</s>
<s>
The	O
Contaflex	B-Algorithm
Super	O
(	O
new	O
)	O
and	O
Contaflex	B-Algorithm
Super	O
B	O
are	O
very	O
similar	O
cameras	O
.	O
</s>
<s>
(	O
Magazine	O
backs	O
,	O
rare	O
among	O
35mm	O
cameras	O
,	O
were	O
also	O
supplied	O
for	O
the	O
Contarex	B-Algorithm
of	O
Zeiss	O
Ikon	O
.	O
)	O
</s>
<s>
The	O
Contaflex	B-Algorithm
Super	O
BC	O
was	O
introduced	O
in	O
1965	O
,	O
and	O
was	O
a	O
Super	O
B	O
with	O
the	O
selenium	O
meter	O
replaced	O
by	O
a	O
CdS	O
through-the-lens	O
exposure	O
meter	O
.	O
</s>
<s>
The	O
Contaflex	B-Algorithm
S	O
was	O
the	O
last	O
variant	O
,	O
introduced	O
in	O
1968	O
,	O
and	O
was	O
simply	O
a	O
renamed	O
Super	O
BC	O
.	O
</s>
<s>
It	O
had	O
a	O
black	O
rectangle	O
marked	O
Contaflex	B-Algorithm
S	O
on	O
the	O
front	O
,	O
and	O
a	O
different	O
,	O
newer	O
Zeiss	O
Ikon	O
logo	O
.	O
</s>
<s>
Both	O
the	O
Contaflex	B-Algorithm
Super	O
BC	O
and	O
S	O
were	O
,	O
along	O
with	O
the	O
126-format	O
Contaflex	B-Algorithm
126	O
,	O
available	O
in	O
chrome	O
or	O
black	O
finish	O
.	O
</s>
<s>
We	O
have	O
already	O
seen	O
that	O
the	O
Contaflex	B-Algorithm
I	O
and	O
II	O
could	O
only	O
take	O
the	O
Teleskop	O
1.7x	O
supplementary	O
lenses	O
,	O
and	O
that	O
the	O
Alpha	O
,	O
Beta	O
and	O
Prima	O
had	O
their	O
own	O
limited	O
range	O
of	O
Pantar	O
supplementary	O
lenses	O
.	O
</s>
<s>
The	O
Contaflex	B-Algorithm
126	O
is	O
a	O
completely	O
different	O
body	O
.	O
</s>
<s>
Its	O
only	O
relation	O
to	O
the	O
rest	O
of	O
the	O
Contaflex	B-Algorithm
family	O
is	O
its	O
name	O
.	O
</s>
<s>
It	O
was	O
one	O
of	O
the	O
very	O
few	O
SLRs	B-Algorithm
taking	O
126	O
film	O
,	O
and	O
one	O
of	O
the	O
very	O
few	O
ambitious	O
cameras	O
using	O
that	O
film	O
.	O
</s>
<s>
(	O
Two	O
other	O
examples	O
of	O
126	O
SLRs	B-Algorithm
are	O
the	O
Rollei	O
SL26	O
and	O
Kodak	O
Instamatic	O
Reflex	O
.	O
)	O
</s>
<s>
The	O
Contaflex	B-Algorithm
126	O
is	O
an	O
SLR	B-Algorithm
with	O
a	O
focal-plane	O
shutter	O
and	O
interchangeable	O
lenses	O
.	O
</s>
<s>
The	O
Contaflex	B-Algorithm
126	O
lenses	O
are	O
often	O
confused	O
with	O
other	O
lenses	O
by	O
the	O
sellers	O
.	O
</s>
<s>
They	O
can	O
only	O
be	O
used	O
on	O
the	O
Contaflex	B-Algorithm
126	O
body	O
,	O
that	O
can	O
only	O
take	O
the	O
obsolete	O
126	O
cartridge	O
,	O
so	O
the	O
value	O
of	O
these	O
lenses	O
is	O
not	O
very	O
high	O
,	O
despite	O
their	O
famous	O
names	O
.	O
</s>
<s>
One	O
of	O
them	O
was	O
the	O
SL725	O
,	O
which	O
would	O
be	O
a	O
successor	O
to	O
the	O
Contaflex	B-Algorithm
line	O
with	O
an	O
electronic	O
shutter	O
.	O
</s>
<s>
The	O
lens	O
mount	O
was	O
a	O
modification	O
of	O
the	O
Contarex	B-Algorithm
camera	I-Algorithm
lens	I-Algorithm
mount	I-Algorithm
.	O
</s>
