<s>
The	O
Leica	B-Algorithm
M3	I-Algorithm
is	O
a	O
35	O
mm	O
rangefinder	B-Algorithm
camera	I-Algorithm
by	O
Ernst	O
Leitz	O
GmbH	O
(	O
now	O
Leica	O
Camera	O
AG	O
)	O
,	O
introduced	O
in	O
1954	O
.	O
</s>
<s>
The	O
M3	O
introduced	O
several	O
features	O
to	O
the	O
Leica	O
,	O
among	O
them	O
the	O
combination	O
of	O
viewfinder	O
and	O
rangefinder	B-Algorithm
in	O
one	O
bright	O
window	O
,	O
like	O
on	O
the	O
Contax	B-Algorithm
II	I-Algorithm
,	O
a	O
bayonet	O
lens	O
mount	O
,	O
and	O
rapid	O
film	O
advance	O
lever	O
.	O
</s>
<s>
It	O
was	O
succeeded	O
by	O
a	O
number	O
of	O
later	O
film	O
M	B-Algorithm
series	I-Algorithm
cameras	I-Algorithm
,	O
including	O
the	O
Leica	B-Algorithm
M-A	I-Algorithm
film	O
camera	O
in	O
2014	O
.	O
</s>
<s>
The	O
earliest	O
Leica	B-Algorithm
M3	I-Algorithm
pre-model	O
that	O
was	O
built	O
,	O
sold	O
at	O
auction	O
in	O
2009	O
for	O
€	O
72,000	O
.	O
</s>
<s>
This	O
new	O
bayonet	O
mount	O
,	O
which	O
has	O
not	O
been	O
changed	O
in	O
the	O
following	O
half	O
century	O
,	O
is	O
called	O
the	O
Leica	B-Algorithm
M-mount	I-Algorithm
.	O
</s>
<s>
It	O
was	O
the	O
first	O
Leica	O
to	O
combine	O
rangefinder	B-Algorithm
and	O
viewfinder	O
into	O
one	O
window	O
.	O
</s>
<s>
(	O
Other	O
cameras	O
,	O
such	O
as	O
the	O
Contax	B-Algorithm
II	I-Algorithm
,	O
already	O
had	O
this	O
feature	O
before	O
World	O
War	O
II	O
;	O
and	O
other	O
companies	O
were	O
making	O
screwmount	O
bodies	O
with	O
combined	O
finders	O
.	O
)	O
</s>
<s>
a	O
separate	O
viewfinder	O
slid	O
into	O
the	O
accessory	B-Algorithm
shoe	I-Algorithm
.	O
</s>
<s>
the	O
so-called	O
Leica	O
"	O
Specs	O
"	O
or	O
"	O
glasses	O
"	O
:	O
These	O
auxiliary	O
lenses/prisms	O
are	O
put	O
in	O
front	O
of	O
the	O
viewfinder	O
and	O
rangefinder	B-Algorithm
windows	O
for	O
the	O
35mm	O
focal	O
length	O
.	O
</s>
<s>
This	O
parallax	B-Device
problem	O
is	O
compensated	O
in	O
the	O
M3	O
by	O
moving	O
the	O
framelines	O
when	O
the	O
lens	O
is	O
focused	O
.	O
</s>
<s>
This	O
full	O
parallax	B-Device
compensation	O
is	O
limited	O
to	O
one	O
metre	O
;	O
closer	O
distances	O
require	O
special	O
"	O
Leica	O
glasses	O
"	O
as	O
described	O
above	O
.	O
</s>
<s>
For	O
fear	O
of	O
tearing	O
the	O
film	O
,	O
early	O
M3s	O
had	O
a	O
double	O
stroke	O
advance	O
lever	O
,	O
like	O
the	O
Neoca	B-Algorithm
2s	I-Algorithm
would	O
.	O
</s>
<s>
The	O
Leica	O
24x27	O
was	O
a	O
camera	O
with	O
neither	O
rangefinder	B-Algorithm
nor	O
viewfinder	O
,	O
made	O
for	O
the	O
postal	O
service	O
to	O
photograph	O
electricity	O
meters	O
.	O
</s>
<s>
The	O
M3	O
was	O
supplemented	O
by	O
the	O
M2	B-Algorithm
with	O
a	O
0.72	O
×	O
viewfinder	O
more	O
suited	O
to	O
wide-angle	O
lenses	O
.	O
</s>
<s>
The	O
next	O
model	O
was	O
the	O
rangefinder-less	O
M1	B-Algorithm
,	O
intended	O
as	O
an	O
interface	O
with	O
scientific	O
instruments	O
or	O
with	O
a	O
visoflex	O
.	O
</s>
<s>
With	O
the	O
exception	O
of	O
the	O
larger	O
Leica	B-Algorithm
M5	I-Algorithm
,	O
subsequent	O
Leica	O
M-series	O
cameras	O
have	O
a	O
strong	O
family	O
resemblance	O
to	O
the	O
M3	O
.	O
</s>
<s>
In	O
2002	O
,	O
a	O
miniature	O
replica	O
camera	O
,	O
the	O
Digital	B-Device
Classic	I-Device
Camera	I-Device
Leica	I-Device
M3	I-Device
,	O
was	O
made	O
by	O
Minox	O
(	O
by	O
then	O
bought	O
by	O
Leica	O
)	O
.	O
</s>
