<s>
The	O
Sony	B-Algorithm
E	I-Algorithm
20mm	I-Algorithm
F2.8	I-Algorithm
is	O
a	O
wide-angle	O
prime	O
lens	O
for	O
the	O
Sony	B-Algorithm
E-mount	I-Algorithm
,	O
announced	O
by	O
Sony	O
in	O
April	O
2013	O
.	O
</s>
<s>
The	O
lens	O
itself	O
is	O
colloquially	O
referred	O
to	O
as	O
a	O
pancake	O
lens	O
as	O
it	O
is	O
currently	O
the	O
thinnest	O
lens	O
offered	O
for	O
Sony	B-Algorithm
E-mount	I-Algorithm
.	O
</s>
<s>
The	O
image	O
quality	O
of	O
the	O
lens	O
is	O
significantly	O
better	O
than	O
that	O
of	O
the	O
16mm	B-Algorithm
pancake	I-Algorithm
lens	I-Algorithm
,	O
suffering	O
mild	O
barrel	O
distortion	O
and	O
moderate	O
vignetting	O
.	O
</s>
