<s>
The	O
Leica	B-Algorithm
Standard	I-Algorithm
,	O
Model	O
E	O
was	O
the	O
fourth	O
version	O
of	O
the	O
original	O
35	O
mm	O
Leica	O
camera	O
to	O
be	O
launched	O
from	O
Ernst	O
Leitz	O
in	O
Wetzlar	O
,	O
Germany	O
.	O
</s>
<s>
The	O
Leica	B-Algorithm
Standard	I-Algorithm
,	O
Model	O
E	O
was	O
the	O
fourth	O
version	O
of	O
the	O
original	O
35	O
mm	O
Leica	O
camera	O
to	O
be	O
launched	O
from	O
Ernst	O
Leitz	O
in	O
Wetzlar	O
,	O
Germany	O
.	O
</s>
<s>
The	O
Leica	B-Algorithm
Standard	I-Algorithm
was	O
introduced	O
as	O
a	O
basic	O
model	O
by	O
Ernst	O
Leitz	O
,	O
Wetzlar	O
in	O
October	O
1932	O
.	O
</s>
<s>
The	O
camera	O
began	O
production	O
in	O
the	O
same	O
year	O
as	O
the	O
Leica	B-Algorithm
II	I-Algorithm
with	O
a	O
coupled	B-Algorithm
rangefinder	I-Algorithm
.	O
</s>
<s>
The	O
Leica	B-Algorithm
III	I-Algorithm
with	O
lower	O
shutter	O
speeds	O
was	O
introduced	O
in	O
1933	O
;	O
this	O
model	O
would	O
later	O
have	O
the	O
faster	O
speed	O
of	O
1/1000	O
sec	O
with	O
the	O
IIIa	O
of	O
1935	O
,	O
though	O
the	O
Leica	B-Algorithm
III	I-Algorithm
would	O
continue	O
in	O
parallel	O
production	O
for	O
several	O
years	O
.	O
</s>
<s>
All	O
these	O
models	O
use	O
the	O
standardised	O
lens	B-Algorithm
mount	I-Algorithm
with	O
distance	O
from	O
film	O
plane	O
to	O
lens	O
flange	O
fixed	O
to	O
28.8mm	O
,	O
a	O
Leitz	O
standard	O
.	O
</s>
<s>
This	O
feature	O
was	O
first	O
seen	O
on	O
late	O
Leica	O
I	O
model	O
C	O
cameras	O
in	O
1931	O
,	O
and	O
all	O
Leica	B-Algorithm
II	I-Algorithm
,	O
Model	O
D	O
from	O
1932	O
,	O
identified	O
by	O
a	O
"	O
0	O
"	O
(	O
zero	O
)	O
stamped	O
on	O
the	O
lens	B-Algorithm
mount	I-Algorithm
flange	O
at	O
the	O
top	O
,	O
to	O
indicate	O
the	O
implementation	O
of	O
the	O
standard	O
,	O
a	O
practice	O
that	O
was	O
continued	O
for	O
some	O
time	O
.	O
</s>
<s>
It	O
is	O
found	O
on	O
early	O
Leica	B-Algorithm
Standards	I-Algorithm
as	O
well	O
.	O
</s>
<s>
The	O
original	O
lens	O
for	O
the	O
Leica	B-Algorithm
Standard	I-Algorithm
when	O
introduced	O
was	O
the	O
Leitz	O
Elmar	O
1:3.5	O
F	O
=	O
50mm	O
in	O
a	O
collapsible	O
nickel-plated	O
focusing	O
mount	O
with	O
infinity	O
catch	O
.	O
</s>
<s>
The	O
Leica	B-Algorithm
Standard	I-Algorithm
was	O
at	O
first	O
made	O
only	O
in	O
black	O
enamel	O
finish	O
,	O
with	O
nickel-plated	O
lens	O
barrel	O
and	O
camera	O
controls	O
.	O
</s>
<s>
The	O
accessory	B-Algorithm
shoe	I-Algorithm
on	O
the	O
top	O
plate	O
sits	O
exactly	O
above	O
the	O
lens	B-Algorithm
mount	I-Algorithm
for	O
fitting	O
either	O
a	O
rangefinder	B-Algorithm
or	O
an	O
accessory	O
viewfinder	O
.	O
</s>
<s>
The	O
Standard	O
in	O
its	O
basic	O
version	O
is	O
not	O
a	O
rangefinder	B-Algorithm
camera	I-Algorithm
.	O
</s>
<s>
However	O
,	O
the	O
black	O
enamelled	O
FOKOS	O
short	O
base	O
rangefinder	B-Algorithm
was	O
made	O
available	O
from	O
the	O
start	O
,	O
as	O
well	O
as	O
a	O
higher	O
ever-ready	O
case	O
accommodating	O
it	O
.	O
</s>
<s>
The	O
measured	O
subject	O
distance	O
using	O
the	O
rangefinder	B-Algorithm
must	O
be	O
set	O
on	O
the	O
lens	O
 '	O
distance	O
scale	O
manually	O
.	O
</s>
<s>
Some	O
Standard	O
cameras	O
were	O
assembled	O
at	O
Leitz	O
New	O
York	O
during	O
the	O
1940s	O
from	O
spare	O
parts	O
using	O
Leica	B-Algorithm
III	I-Algorithm
body	O
shells	O
and	O
equipped	O
them	O
with	O
Wollensak	O
lenses	O
.	O
</s>
