<s>
The	O
Nikon	B-Algorithm
S-mount	I-Algorithm
is	O
a	O
type	O
of	O
interchangeable	B-Algorithm
lens	I-Algorithm
mount	O
used	O
by	O
a	O
series	O
of	O
Nikon	B-Algorithm
35mm	O
rangefinder	B-Algorithm
cameras	I-Algorithm
(	O
Nikon	B-Algorithm
I	I-Algorithm
,	O
Nikon	B-Algorithm
M	I-Algorithm
,	O
Nikon	B-Algorithm
S	I-Algorithm
,	O
Nikon	B-Algorithm
S2	O
,	O
Nikon	B-Algorithm
SP	I-Algorithm
,	O
Nikon	B-Algorithm
S3	I-Algorithm
,	O
Nikon	B-Algorithm
S4	I-Algorithm
)	O
.	O
</s>
<s>
The	O
mount	O
was	O
a	O
copy	O
of	O
the	O
Zeiss	O
Ikon	O
Contax	O
rangefinder	B-Algorithm
mount	O
,	O
however	O
,	O
small	O
differences	O
between	O
the	O
two	O
mean	O
that	O
although	O
Zeiss	O
wide-angle	O
lenses	O
can	O
be	O
used	O
on	O
the	O
Nikon	B-Algorithm
cameras	O
and	O
vice	O
versa	O
,	O
the	O
longer	O
lenses	O
(	O
50mm	O
and	O
above	O
)	O
,	O
if	O
used	O
,	O
will	O
not	O
be	O
able	O
to	O
focus	O
at	O
both	O
close	O
range	O
and	O
infinity	O
.	O
</s>
<s>
Nikon	B-Algorithm
made	O
a	O
small	O
number	O
of	O
longer	O
focal	O
length	O
lenses	O
specifically	O
designed	O
to	O
focus	O
properly	O
when	O
mounted	O
on	O
a	O
Contax	O
.	O
</s>
<s>
Nikon	B-Algorithm
produced	O
a	O
very	O
large	O
range	O
of	O
Nikkor	O
lenses	O
for	O
these	O
cameras	O
with	O
focal	O
lengths	O
from	O
21mm	O
to	O
1000mm	O
.	O
</s>
<s>
In	O
2002	O
,	O
Cosina	B-Algorithm
Voigtländer	I-Algorithm
manufactured	O
a	O
camera	O
(	O
the	O
Bessa	O
R2S	O
)	O
as	O
well	O
as	O
several	O
lenses	O
for	O
the	O
Nikon	B-Algorithm
S-mount	I-Algorithm
.	O
</s>
