<s>
The	O
Canon	B-Algorithm
7	I-Algorithm
was	O
a	O
focal-plane	O
shutter	O
rangefinder	B-Algorithm
system	I-Algorithm
camera	I-Algorithm
with	O
an	O
integrated	O
selenium	O
light	O
meter	O
introduced	O
by	O
Canon	O
Inc	O
.	O
in	O
September	O
1961	O
,	O
the	O
last	O
model	O
compatible	O
with	O
the	O
Leica	O
M39	B-Algorithm
lens	I-Algorithm
mount	I-Algorithm
.	O
</s>
<s>
Later	O
versions	O
,	O
branded	O
Canon	B-Algorithm
7s	I-Algorithm
and	O
Canon	B-Algorithm
7s	I-Algorithm
Type	O
II	O
(	O
or	O
Canon	O
7sZ	O
)	O
,	O
had	O
a	O
cadmium	O
sulfide	O
light	O
meter	O
.	O
</s>
<s>
The	O
Canon	B-Algorithm
7	I-Algorithm
came	O
when	O
the	O
first	O
Canon	O
single-lens	B-Algorithm
reflex	I-Algorithm
cameras	I-Algorithm
were	O
already	O
on	O
the	O
market	O
,	O
but	O
it	O
was	O
felt	O
that	O
there	O
was	O
a	O
need	O
for	O
a	O
fast-shooting	O
rangefinder	B-Algorithm
camera	I-Algorithm
for	O
reportage	O
.	O
</s>
<s>
In	O
this	O
niche	O
,	O
the	O
Canon	B-Algorithm
7	I-Algorithm
came	O
into	O
direct	O
competition	O
with	O
the	O
Leica	B-Algorithm
M3	I-Algorithm
.	O
</s>
<s>
Some	O
Canon	B-Algorithm
7s	I-Algorithm
were	O
sold	O
in	O
the	O
US	O
branded	O
Bell	O
&	O
Howell	O
,	O
in	O
a	O
partnership	O
that	O
lasted	O
until	O
1975	O
.	O
</s>
