<s>
The	O
EF	O
500mm	O
lenses	O
are	O
a	O
group	O
of	O
super-telephoto	O
prime	O
lenses	O
made	O
by	O
Canon	O
that	O
share	O
the	O
same	O
focal	B-Algorithm
length	I-Algorithm
.	O
</s>
<s>
These	O
lenses	O
have	O
an	O
EF	B-Application
type	I-Application
mount	I-Application
,	O
and	O
fit	O
the	O
Canon	B-Algorithm
EOS	I-Algorithm
line	O
of	O
digital	B-Device
single	I-Device
lens	I-Device
reflex	I-Device
cameras	I-Device
.	O
</s>
<s>
When	O
used	O
on	O
a	O
camera	O
with	O
a	O
field	O
of	O
view	O
compensation	O
factor	O
of	O
1.6x	O
,	O
such	O
as	O
the	O
Canon	B-Algorithm
EOS	I-Algorithm
400D	I-Algorithm
,	O
they	O
provide	O
a	O
narrower	O
field	O
of	O
view	O
,	O
equivalent	O
to	O
an	O
800mm	O
lens	O
mounted	O
on	O
a	O
35mm	O
frame	O
body	O
.	O
</s>
<s>
With	O
a	O
1.3x	O
body	O
such	O
as	O
the	O
Canon	B-Algorithm
EOS-1D	I-Algorithm
Mark	I-Algorithm
III	I-Algorithm
,	O
they	O
provide	O
a	O
less	O
narrow	O
field	O
of	O
view	O
,	O
equivalent	O
to	O
a	O
650mm	O
lens	O
mounted	O
on	O
a	O
35mm	O
frame	O
body	O
.	O
</s>
<s>
A	O
9	O
bladed	O
maximum	O
aperture	B-General_Concept
of	O
4.5	O
,	O
gives	O
this	O
lens	O
the	O
ability	O
to	O
create	O
depth	O
of	O
field	O
effects	O
.	O
</s>
<s>
This	O
lens	O
is	O
compatible	O
with	O
the	O
Canon	B-Algorithm
Extender	I-Algorithm
EF	I-Algorithm
teleconverters	O
.	O
</s>
<s>
An	O
8	O
bladed	O
maximum	O
aperture	B-General_Concept
of	O
4	O
gives	O
this	O
lens	O
the	O
ability	O
to	O
create	O
depth	O
of	O
field	O
effects	O
.	O
</s>
<s>
This	O
lens	O
is	O
compatible	O
with	O
the	O
Canon	B-Algorithm
Extender	I-Algorithm
EF	I-Algorithm
teleconverters	O
.	O
</s>
<s>
It	O
also	O
has	O
a	O
9-blade	O
aperture	B-General_Concept
instead	O
of	O
the	O
8	O
blades	O
of	O
the	O
Mark	O
I	O
.	O
</s>
<s>
Attribute	O
4.5L	O
USM	O
4L	O
IS	O
USM	O
4L	O
IS	O
II	O
USMImage100px	O
Key	O
features	O
Full-frame	B-Algorithm
compatible	I-Algorithm
15px|Yes	O
Yes	O
Image	O
stabilizer	O
15px|No	O
No	O
15px|Yes	O
Yes	O
Environmental	O
sealing	O
15px|Yes	O
Yes	O
Ultrasonic	O
Motor	O
15px|Yes	O
Yes	O
Stepping	O
Motor	O
15px|No	O
No	O
L-series	O
15px|Yes	O
Yes	O
Diffractive	O
Optics	O
15px|No	O
No	O
Macro	O
15px|No	O
No	O
Technical	O
data	O
Focal	B-Algorithm
length	I-Algorithm
500	O
mm	O
Aperture	B-General_Concept
(	O
max/min	O
)	O
4.5	O
/	O
32	O
4	O
/	O
32	O
Construction	O
8	O
elements	O
/	O
7	O
groups	O
17	O
elements	O
/	O
13	O
groups	O
16	O
elements	O
/	O
12	O
groups	O
#	O
of	O
diaphragm	O
blades	O
9	O
8	O
9	O
(	O
circular	O
aperture	B-General_Concept
)	O
Closest	O
focusing	O
distance	O
5	O
m	O
(	O
16.45	O
ft	O
)	O
4.5	O
m	O
(	O
14.8	O
ft	O
)	O
3.7	O
m	O
(	O
12.14	O
ft	O
)	O
Max	O
.	O
</s>
