<s>
The	O
Canon	B-Algorithm
FTb	I-Algorithm
is	O
a	O
35	O
mm	O
single-lens	B-Algorithm
reflex	I-Algorithm
camera	I-Algorithm
manufactured	O
by	O
Canon	O
of	O
Japan	O
from	O
March	O
1971	O
replacing	O
the	O
Canon	B-Algorithm
FT	I-Algorithm
QL	I-Algorithm
.	O
</s>
<s>
It	O
features	O
a	O
Canon	B-Algorithm
FD	I-Algorithm
lens	I-Algorithm
mount	I-Algorithm
,	O
and	O
is	O
also	O
compatible	O
with	O
Canon	O
's	O
earlier	O
FL-mount	B-Algorithm
lenses	O
in	O
stop-down	O
metering	O
mode	O
.	O
</s>
<s>
Launched	O
alongside	O
the	O
top-of-the-line	O
F-1	B-Algorithm
,	O
the	O
FTb	O
was	O
the	O
mass-market	O
camera	O
in	O
the	O
range	O
.	O
</s>
<s>
The	O
FTb	O
was	O
primarily	O
intended	O
to	O
be	O
a	O
camera	O
for	O
the	O
advanced	O
amateur	O
photographer	O
,	O
offering	O
many	O
of	O
the	O
same	O
features	O
and	O
same	O
build	O
quality	O
as	O
the	O
F-1	B-Algorithm
,	O
but	O
without	O
the	O
option	O
of	O
interchangeable	O
prisms	O
,	O
focusing	O
screens	O
,	O
or	O
motor	O
drives	O
.	O
</s>
<s>
The	O
Canon	B-Algorithm
FTb	I-Algorithm
was	O
released	O
at	O
a	O
retail	O
price	O
of	O
35,000	O
yen	O
for	O
the	O
camera	O
body	O
( $99	O
,	O
or	O
US$580	O
in	O
1971	O
USD	O
)	O
.	O
</s>
<s>
The	O
FTb	O
has	O
rubberized	O
silk	O
shutter	O
curtains	O
rather	O
than	O
the	O
more	O
durable	O
but	O
more	O
expensive	O
titanium	O
curtains	O
found	O
on	O
the	O
F-1	B-Algorithm
.	O
</s>
<s>
The	O
stop	O
down	O
lever	O
was	O
changed	O
to	O
the	O
same	O
style	O
as	O
that	O
found	O
on	O
the	O
F-1	B-Algorithm
.	O
</s>
