<s>
The	O
Leica	B-Algorithm
R3	I-Algorithm
was	O
a	O
35mm	O
SLR	B-Algorithm
camera	I-Algorithm
by	O
Leica	O
and	O
the	O
first	O
model	O
of	O
their	O
R	B-Algorithm
series	O
.	O
</s>
<s>
Leica	O
launched	O
the	O
Leica	B-Algorithm
R3	I-Algorithm
in	O
1976	O
.	O
</s>
<s>
It	O
was	O
the	O
successor	O
of	O
the	O
Leicaflex	B-Algorithm
SL2	I-Algorithm
,	O
and	O
was	O
developed	O
in	O
cooperation	O
with	O
Minolta	O
,	O
together	O
with	O
the	O
Minolta	B-Algorithm
XE	I-Algorithm
bodies	O
.	O
</s>
<s>
It	O
was	O
a	O
35mm	O
SLR	B-Algorithm
with	O
a	O
Copal	O
CLS	O
electronic	O
focal	O
plane	O
shutter	O
,	O
which	O
was	O
produced	O
for	O
Leica	O
and	O
Minolta	O
only	O
.	O
</s>
<s>
Following	O
the	O
Leicaflex	B-Algorithm
series	O
Leica	O
took	O
a	O
totally	O
new	O
approach	O
;	O
the	O
R3	O
was	O
developed	O
in	O
cooperation	O
with	O
Minolta	O
and	O
closely	O
based	O
on	O
their	O
XE	O
.	O
</s>
<s>
In	O
appearance	O
very	O
similar	O
to	O
the	O
Minolta	B-Algorithm
XE	I-Algorithm
using	O
the	O
same	O
electronics	O
,	O
the	O
camera	O
incorporated	O
a	O
Leica	O
developed	O
shutter	O
and	O
modifications	O
to	O
the	O
metering	O
system	O
offering	O
Leica	O
's	O
traditional	O
facility	O
of	O
selective	O
metering	O
in	O
addition	O
to	O
integrated	O
(	O
centre	O
weighted	O
)	O
metering	O
.	O
</s>
<s>
It	O
was	O
the	O
first	O
Leica	O
SLR	B-Algorithm
camera	I-Algorithm
to	O
offer	O
automatic	O
exposure	O
.	O
</s>
<s>
The	O
camera	O
was	O
a	O
commercial	O
success	O
at	O
a	O
very	O
difficult	O
time	O
for	O
the	O
company	O
,	O
sales	O
of	O
the	O
latest	O
rangefinder	O
Leica	B-Algorithm
M5	I-Algorithm
had	O
been	O
very	O
poor	O
and	O
the	O
previous	O
Leicaflex	B-Algorithm
series	O
had	O
made	O
little	O
or	O
no	O
profit	O
leaving	O
the	O
company	O
in	O
a	O
precarious	O
financial	O
state	O
,	O
the	O
R3	O
's	O
success	O
seemed	O
to	O
indicate	O
a	O
new	O
direction	O
.	O
</s>
<s>
For	O
selective	O
measurement	O
the	O
R3	O
used	O
a	O
secondary	O
mirror	O
with	O
light	O
cell	O
in	O
the	O
base	O
just	O
like	O
the	O
Leicaflex	B-Algorithm
SL	I-Algorithm
.	O
</s>
<s>
The	O
Leicaflex	B-Algorithm
camera	O
lenses	O
had	O
either	O
one	O
or	O
two	O
sloping	O
cams	O
for	O
aperture	O
connection	O
.	O
</s>
<s>
From	O
then	O
on	O
most	O
lenses	O
were	O
made	O
with	O
all	O
three	O
cams	O
but	O
a	O
few	O
,	O
especially	O
those	O
supplied	O
with	O
R	B-Algorithm
cameras	O
,	O
had	O
only	O
the	O
third	O
stepped	O
cam	O
and	O
were	O
marked	O
"	O
Leica	B-Algorithm
R	I-Algorithm
Only	O
"	O
.	O
</s>
