<s>
The	O
Canon	B-Algorithm
F-1	I-Algorithm
is	O
a	O
35	O
mm	O
single-lens	B-Algorithm
reflex	I-Algorithm
camera	I-Algorithm
produced	O
by	O
Canon	O
of	O
Japan	O
from	O
March	O
1971	O
until	O
the	O
end	O
of	O
1981	O
,	O
at	O
which	O
point	O
it	O
had	O
been	O
superseded	O
by	O
the	O
New	B-Algorithm
F-1	I-Algorithm
launched	O
earlier	O
that	O
year	O
.	O
</s>
<s>
The	O
Canon	B-Algorithm
FD	I-Algorithm
lens	I-Algorithm
mount	I-Algorithm
was	O
introduced	O
along	O
with	O
the	O
F-1	O
,	O
but	O
the	O
previous	O
Canon	O
FL-mount	O
lenses	O
and	O
older	O
R	B-Algorithm
-	I-Algorithm
series	I-Algorithm
lenses	O
were	O
also	O
compatible	O
with	O
the	O
camera	O
with	O
some	O
limitations	O
.	O
</s>
<s>
The	O
Canon	B-Algorithm
F-1	I-Algorithm
was	O
marketed	O
as	O
a	O
competitor	O
to	O
the	O
Nikon	B-Algorithm
F	I-Algorithm
and	O
Nikon	B-Algorithm
F2	I-Algorithm
single	B-Algorithm
lens	I-Algorithm
reflex	I-Algorithm
cameras	I-Algorithm
by	O
Nikon	B-Algorithm
.	O
</s>
<s>
The	O
F-1	O
was	O
Canon	O
's	O
first	O
successful	O
professional-grade	O
SLR	B-Algorithm
system	O
,	O
supporting	O
a	O
huge	O
variety	O
of	O
accessories	O
and	O
interchangeable	O
parts	O
so	O
it	O
could	O
be	O
adapted	O
for	O
different	O
uses	O
and	O
preferences	O
.	O
</s>
<s>
In	O
1972	O
Canon	O
launched	O
a	O
Highspeed	O
model	O
with	O
a	O
fixed	O
pellicle	B-Algorithm
mirror	I-Algorithm
that	O
allowed	O
the	O
user	O
to	O
see	O
the	O
subject	O
at	O
all	O
times	O
.	O
</s>
<s>
The	O
Canon	B-Algorithm
F-1	I-Algorithm
uses	O
the	O
Canon	B-Algorithm
FD	I-Algorithm
lens	I-Algorithm
mount	I-Algorithm
,	O
which	O
was	O
introduced	O
alongside	O
the	O
camera	O
.	O
</s>
<s>
Between	O
1970	O
and	O
1979	O
,	O
a	O
total	O
of	O
68	O
different	O
FD	B-Algorithm
mount	I-Algorithm
lens	O
models	O
were	O
produced	O
,	O
ranging	O
from	O
7.5mm	O
to	O
800mm	O
in	O
focal	B-Algorithm
length	I-Algorithm
.	O
</s>
<s>
One	O
exception	O
is	O
the	O
FLP	O
38mm	O
F2.8	O
,	O
which	O
was	O
designed	O
for	O
the	O
Canon	B-Algorithm
Pellix	I-Algorithm
.	O
</s>
<s>
This	O
lens	O
 '	O
rear	O
element	O
extends	O
further	O
into	O
the	O
camera	O
body	O
than	O
other	O
FL-mount	O
lenses	O
,	O
and	O
would	O
obstruct	O
the	O
moving	O
mirror	O
of	O
the	O
Canon	B-Algorithm
F-1	I-Algorithm
.	O
</s>
<s>
The	O
Canon	B-Algorithm
F-1	I-Algorithm
has	O
one	O
of	O
the	O
largest	O
set	O
of	O
accessories	O
of	O
any	O
35mm	O
SLR	B-Algorithm
ever	O
produced	O
.	O
</s>
<s>
A	O
Data	O
Back	O
F	O
(	O
for	O
the	O
original	O
F-1	O
and	O
F-1n	O
)	O
or	O
Data	O
Back	O
FN	O
(	O
for	O
the	O
New	B-Algorithm
F-1	I-Algorithm
)	O
(	O
which	O
being	O
mechanical	O
is	O
now	O
incapable	O
of	O
putting	O
the	O
current	O
year	O
on	O
a	O
photo	O
)	O
or	O
a	O
bulk	O
film	O
back	O
that	O
could	O
hold	O
250	O
exposures	O
could	O
be	O
attached	O
.	O
</s>
<s>
The	O
CATS	O
flash	O
equipment	O
was	O
for	O
the	O
later	O
electronic	O
Canon	B-Algorithm
F1	I-Algorithm
New	O
(	O
1981	O
)	O
and	O
it	O
allowed	O
aperture	O
settings	O
from	O
the	O
camera	O
to	O
be	O
communicated	O
to	O
the	O
flash	O
unit	O
.	O
</s>
<s>
TTL	O
Flash	O
was	O
introduced	O
on	O
the	O
Nikon	B-Algorithm
F3	O
(	O
1981	O
)	O
which	O
was	O
a	O
direct	O
competitor	O
of	O
the	O
F1	O
New	O
.	O
</s>
<s>
For	O
many	O
this	O
was	O
considered	O
as	O
a	O
considerable	O
advantage	O
although	O
the	O
ergonomics	O
of	O
the	O
Nikon	B-Algorithm
F3	O
with	O
its	O
liquid	O
crystal	O
display	O
lacked	O
the	O
clarity	O
of	O
the	O
Canon	B-Algorithm
F1	I-Algorithm
.	O
</s>
<s>
A	O
comprehensive	O
set	O
of	O
close-up	O
,	O
macro	O
and	O
microphoto	O
accessories	O
was	O
available	O
for	O
the	O
F-1	O
,	O
including	O
three	O
bellows	O
units	O
,	O
reversing	O
rings	O
and	O
couplers	O
,	O
macro	O
and	O
micro	O
photo	O
hoods	O
and	O
couplers	O
,	O
copy	O
stands	O
,	O
manual	O
and	O
automatic	O
extension	O
tubes	O
and	O
3	O
different	O
focal	B-Algorithm
length	I-Algorithm
macro	O
lenses	O
.	O
</s>
<s>
This	O
revised	O
version	O
is	O
sometimes	O
called	O
the	O
F-1n	O
(	O
not	O
to	O
be	O
confused	O
with	O
the	O
1981	O
New	B-Algorithm
F-1	I-Algorithm
)	O
.	O
</s>
<s>
These	O
Laser	O
Matte	O
screens	O
were	O
noticeably	O
brighter	O
than	O
the	O
earlier	O
screens	O
,	O
and	O
they	O
were	O
continued	O
with	O
the	O
New	B-Algorithm
F-1	I-Algorithm
.	O
</s>
