<s>
The	O
HD	O
Pentax-D	O
FA*	O
50mm	O
f/1.4	O
SDM	O
AW	O
lens	O
is	O
a	O
professional	O
normal	O
prime	O
lens	O
for	O
the	O
Pentax	B-Algorithm
K-mount	I-Algorithm
.	O
</s>
<s>
Its	O
notable	O
features	O
include	O
Pentax	B-Application
's	O
first	O
in-house	O
ring-type	O
ultrasonic	O
motor	O
for	O
fast	O
autofocus	O
,	O
full	O
dust	O
and	O
water	O
resistance	O
,	O
and	O
an	O
advanced	O
optical	O
formula	O
for	O
high-resolution	O
images	O
with	O
smooth	O
bokeh	O
.	O
</s>
<s>
While	O
this	O
lens	O
is	O
developed	O
and	O
manufactured	O
by	O
Pentax	B-Application
,	O
Tokina	O
offers	O
an	O
optically	O
identical	O
lens	O
as	O
part	O
of	O
their	O
"	O
Opera	O
"	O
series	O
for	O
Canon	O
EF	O
and	O
Nikon	O
F	O
mount	O
.	O
</s>
