<s>
The	O
Canon	B-Algorithm
Extender	I-Algorithm
EF	I-Algorithm
lenses	O
are	O
a	O
group	O
of	O
teleconverter	O
lenses	O
made	O
by	O
Canon	O
.	O
</s>
<s>
These	O
lenses	O
are	O
used	O
between	O
any	O
compatible	O
EF	B-Application
type	I-Application
lens	I-Application
and	O
any	O
of	O
the	O
Canon	B-Algorithm
EOS	I-Algorithm
line	O
of	O
cameras	O
.	O
</s>
<s>
For	O
example	O
,	O
using	O
a	O
1.4x	O
or	O
2x	O
extender	O
with	O
the	O
Canon	B-Algorithm
EF	I-Algorithm
500mm	I-Algorithm
f/4L	I-Algorithm
IS	I-Algorithm
USM	I-Algorithm
would	O
result	O
in	O
a	O
700mm	O
f/5.6	O
or	O
1000mm	O
f/8	O
lens	O
.	O
</s>
<s>
These	O
Extender	O
EF	B-Application
lenses	I-Application
can	O
only	O
be	O
used	O
with	O
lenses	O
that	O
have	O
a	O
compatible	O
mount	O
.	O
</s>
<s>
While	O
all	O
EF	B-Application
lenses	I-Application
have	O
mount	O
designs	O
that	O
can	O
be	O
used	O
with	O
EOS	B-Algorithm
bodies	O
,	O
only	O
lenses	O
with	O
accordant	O
mounts	O
can	O
be	O
used	O
with	O
the	O
extender	O
EF	B-Application
lenses	I-Application
.	O
</s>
<s>
Autofocus	O
speed	O
of	O
any	O
used	O
EF	B-Application
lens	I-Application
is	O
also	O
affected	O
.	O
</s>
<s>
Image	O
stabilization	O
may	O
not	O
work	O
on	O
lenses	O
that	O
are	O
equipped	O
with	O
an	O
extender	O
,	O
or	O
on	O
certain	O
EOS	B-Algorithm
bodies	O
.	O
</s>
<s>
Some	O
EOS	B-Algorithm
bodies	O
are	O
unable	O
to	O
autofocus	O
when	O
the	O
maximum	O
aperture	O
of	O
a	O
lens	O
is	O
smaller	O
than	O
f/5.6	O
.	O
</s>
<s>
The	O
following	O
is	O
a	O
list	O
of	O
EF	B-Application
lenses	I-Application
that	O
are	O
compatible	O
with	O
the	O
Extender	O
EF	B-Application
lenses	I-Application
together	O
with	O
their	O
resulting	O
focal	O
lengths	O
,	O
and	O
apertures	O
.	O
</s>
<s>
15px|Maybe	O
-	O
AF	O
works	O
only	O
with	O
EOS	B-Algorithm
bodies	O
that	O
can	O
AF	O
at	O
8	O
.	O
</s>
<s>
15px|Maybe	O
-	O
IS	O
works	O
only	O
with	O
supported	O
EOS	B-Algorithm
bodies	O
(	O
generally	O
,	O
bodies	O
introduced	O
since	O
approximately	O
1995	O
)	O
.	O
</s>
<s>
Canon	B-Algorithm
EOS	I-Algorithm
bodies	O
that	O
have	O
a	O
high	O
density	O
,	O
high	O
precision	O
auto-focus	O
sensor	O
with	O
45	O
or	O
more	O
AF	O
points	O
are	O
able	O
to	O
autofocus	O
at	O
maximum	O
apertures	O
of	O
8	O
.	O
</s>
<s>
Canon	B-Algorithm
EOS	I-Algorithm
bodies	O
that	O
have	O
Dual	O
Pixel	O
CMOS	O
AF	O
like	O
the	O
70D	O
and	O
later	O
models	O
support	O
autofocusing	O
in	O
Liveview	O
mode	O
,	O
with	O
maximum	O
apertures	O
as	O
small	O
as	O
f/11	O
.	O
</s>
