<s>
The	O
Leica	B-Algorithm
M2	I-Algorithm
is	O
a	O
35	O
mm	O
rangefinder	B-Algorithm
camera	I-Algorithm
by	O
Ernst	O
Leitz	O
GmbH	O
of	O
Wetzlar	O
,	O
Germany	O
,	O
introduced	O
in	O
1957	O
.	O
</s>
<s>
The	O
M2	O
was	O
considered	O
to	O
be	O
a	O
more	O
affordable	O
,	O
simplified	O
version	O
of	O
the	O
1954	O
Leica	B-Algorithm
M3	I-Algorithm
.	O
</s>
<s>
This	O
system	O
was	O
close	O
to	O
that	O
of	O
the	O
Leica	B-Algorithm
III	I-Algorithm
series	O
,	O
and	O
unlike	O
that	O
of	O
the	O
M3	O
,	O
which	O
is	O
an	O
independent	O
frame	O
counter	O
,	O
visible	O
through	O
a	O
window	O
in	O
the	O
top	O
plate	O
,	O
that	O
automatically	O
resets	O
to	O
zero	O
when	O
the	O
film	O
take-up	O
spool	O
is	O
removed	O
.	O
</s>
<s>
The	O
rangefinder	B-Algorithm
system	O
was	O
also	O
simplified	O
from	O
that	O
of	O
the	O
M3	O
and	O
this	O
made	O
it	O
potentially	O
more	O
prone	O
to	O
rangefinder	B-Algorithm
flare	O
.	O
</s>
<s>
The	O
M2	O
has	O
a	O
rangefinder	B-Algorithm
with	O
a	O
0.72	O
magnification	O
and	O
framelines	O
for	O
35	O
,	O
50	O
and	O
90mm	O
lenses	O
instead	O
of	O
the	O
0.91	O
magnification	O
and	O
50	O
,	O
90	O
and	O
135mm	O
framelines	O
of	O
the	O
M3	O
.	O
</s>
<s>
The	O
M2	O
was	O
followed	O
by	O
the	O
still	O
simpler	O
Leica	B-Algorithm
M1	I-Algorithm
and	O
then	O
the	O
Leica	B-Algorithm
M4	I-Algorithm
,	O
which	O
used	O
a	O
similar	O
rangefinder	B-Algorithm
design	O
but	O
re-introduced	O
the	O
M3	O
style	O
frame	O
counter	O
and	O
added	O
a	O
faster	O
loading	O
system	O
and	O
a	O
canted	O
rewind	O
lever	O
.	O
</s>
<s>
Both	O
cameras	O
are	O
made	O
to	O
a	O
similar	O
level	O
of	O
quality	O
,	O
and	O
the	O
M2	O
's	O
framelines	O
have	O
proved	O
to	O
be	O
more	O
versatile	O
over	O
time	O
,	O
with	O
all	O
subsequent	O
Leica	O
rangefinder	B-Algorithm
models	O
having	O
35mm	O
framelines	O
included	O
.	O
</s>
<s>
There	O
are	O
a	O
number	O
of	O
variations	O
of	O
the	O
Leica	B-Algorithm
M2	I-Algorithm
.	O
</s>
<s>
Near	O
the	O
end	O
of	O
production	O
,	O
Leica	O
also	O
produced	O
a	O
number	O
of	O
M2-R	O
models	O
,	O
which	O
had	O
the	O
faster	O
loading	O
system	O
of	O
the	O
later	O
Leica	B-Algorithm
M4	I-Algorithm
.	O
</s>
