<s>
The	O
Sigma	B-Algorithm
19mm	I-Algorithm
F2.8	I-Algorithm
EX	I-Algorithm
DN	I-Algorithm
lens	O
is	O
a	O
wide-angle	O
prime	O
lens	O
for	O
Sony	B-Algorithm
E	I-Algorithm
and	O
Micro	B-Operating_System
Four-Thirds	I-Operating_System
mounts	O
,	O
announced	O
by	O
Sigma	O
in	O
January	O
2012	O
.	O
</s>
<s>
Along	O
with	O
the	O
Sigma	B-Algorithm
30mm	I-Algorithm
F2.8	I-Algorithm
EX	I-Algorithm
DN	I-Algorithm
,	O
it	O
was	O
part	O
of	O
the	O
first	O
release	O
of	O
Sigma	O
lenses	O
for	O
compact	B-Device
interchangeable	I-Device
lens	I-Device
cameras	I-Device
,	O
and	O
hence	O
the	O
inception	O
of	O
the	O
"	O
DN	O
"	O
line	O
,	O
created	O
by	O
Sigma	O
to	O
cater	O
to	O
these	O
cameras	O
,	O
an	O
offering	O
that	O
in	O
January	O
2013	O
was	O
expanded	O
with	O
another	O
lens	O
,	O
the	O
Sigma	B-Algorithm
60mm	I-Algorithm
f/2.8	I-Algorithm
DN	I-Algorithm
Art	I-Algorithm
.	O
</s>
