<s>
The	O
Smooth	B-Algorithm
Trans	I-Algorithm
Focus	I-Algorithm
(	O
STF	B-Algorithm
)	O
technology	O
in	O
photographic	O
lenses	O
uses	O
an	O
apodization	B-Algorithm
filter	I-Algorithm
to	O
realize	O
notably	O
smooth	O
bokeh	O
with	O
rounded	O
out-of-focus	O
highlights	O
in	O
both	O
the	O
foreground	O
and	O
background	O
.	O
</s>
<s>
This	O
is	O
accomplished	O
by	O
utilizing	O
a	O
concave	O
neutral-gray	O
tinted	O
lens	O
element	O
next	O
to	O
the	O
aperture	O
blades	O
as	O
apodization	B-Algorithm
filter	I-Algorithm
,	O
a	O
technology	O
originally	O
invented	O
(	O
and	O
patented	O
)	O
by	O
Minolta	O
in	O
the	O
1980s	O
,	O
and	O
first	O
implemented	O
in	O
a	O
commercially	O
available	O
lens	O
in	O
1999	O
.	O
</s>
<s>
In	O
contrast	O
to	O
soft	O
focus	O
lenses	O
,	O
STF	B-Algorithm
lenses	O
render	O
a	O
perfectly	O
sharp	O
image	O
in	O
the	O
focus	O
plane	O
.	O
</s>
<s>
Lenses	O
featuring	O
Smooth	B-Algorithm
Trans	I-Algorithm
Focus	I-Algorithm
technology	I-Algorithm
:	O
</s>
