<s>
The	O
Nikkor	O
13mm	O
5.6	O
is	O
an	O
ultra-wide	O
angle	O
rectilinear	O
lens	O
which	O
was	O
manufactured	O
by	O
Nikon	B-Algorithm
for	O
use	O
on	O
Nikon	B-Algorithm
135	O
film	O
format	O
SLR	O
cameras	O
until	O
1998	O
,	O
at	O
which	O
time	O
it	O
was	O
discontinued	O
.	O
</s>
<s>
The	O
lens	O
was	O
produced	O
by	O
Nikon	B-Algorithm
only	O
upon	O
receipt	O
of	O
an	O
order	O
,	O
thus	O
making	O
it	O
one	O
of	O
the	O
Nikon	B-Algorithm
lenses	O
with	O
the	O
least	O
number	O
manufactured	O
.	O
</s>
