<s>
The	O
lens	O
is	O
produced	O
in	O
Canon	B-Application
EF	I-Application
mount	I-Application
,	O
Four	B-Architecture
Thirds	I-Architecture
System	I-Architecture
,	O
Nikon	B-Architecture
F-mount	I-Architecture
,	O
Pentax	B-Algorithm
K	I-Algorithm
mount	I-Algorithm
,	O
Sigma	O
's	O
own	O
SA	B-Algorithm
mount	I-Algorithm
,	O
and	O
the	O
Sony/Minolta	B-Application
AF	I-Application
Mount	I-Application
varieties	O
,	O
all	O
have	O
the	O
same	O
optical	O
formula	O
.	O
</s>
<s>
A	O
nine-blade	O
,	O
maximum	O
aperture	B-General_Concept
of	O
1.4	O
gives	O
the	O
lens	O
the	O
ability	O
to	O
create	O
shallow	O
depth-of-field	O
effects	O
.	O
</s>
<s>
When	O
used	O
on	O
a	O
digital	O
crop	O
body	O
with	O
a	O
field	O
of	O
view	O
compensation	O
factor	O
of	O
2×	O
(	O
Four	B-Architecture
Thirds	I-Architecture
body	O
)	O
,	O
it	O
provides	O
a	O
field	O
of	O
view	O
equivalent	O
to	O
a	O
100mm	O
lens	O
mounted	O
in	O
a	O
35mm	O
body	O
.	O
</s>
<s>
In	O
a	O
1.6	O
×	O
body	O
,	O
such	O
as	O
the	O
Canon	B-Algorithm
EOS	I-Algorithm
7D	I-Algorithm
,	O
it	O
provides	O
a	O
narrower	O
field	O
of	O
view	O
,	O
equivalent	O
to	O
an	O
80mm	O
lens	O
mounted	O
on	O
a	O
35	O
mm	O
frame	O
body	O
.	O
</s>
<s>
With	O
a	O
1.5	O
×	O
body	O
such	O
as	O
the	O
Nikon	B-Algorithm
D300	I-Algorithm
,	O
it	O
provides	O
a	O
less	O
narrow	O
field	O
of	O
view	O
,	O
equivalent	O
to	O
a	O
75mm	O
lens	O
mounted	O
on	O
a	O
35mm	O
frame	O
body	O
.	O
</s>
<s>
With	O
a	O
1.3	O
×	O
body	O
such	O
as	O
the	O
Canon	B-Algorithm
EOS-1D	I-Algorithm
Mark	I-Algorithm
III	I-Algorithm
,	O
it	O
provides	O
an	O
even	O
less	O
narrow	O
field	O
of	O
view	O
,	O
equivalent	O
to	O
a	O
65mm	O
lens	O
mounted	O
on	O
a	O
35mm	O
frame	O
body	O
.	O
</s>
