<s>
The	O
EF	B-Application
17	O
–	O
40mm	O
4L	O
USM	O
lens	O
is	O
a	O
wide-angle	O
lens	O
made	O
by	O
Canon	O
Inc	O
.	O
</s>
<s>
The	O
lens	O
has	O
an	O
EF	B-Application
mount	I-Application
to	O
work	O
with	O
the	O
EOS	B-Algorithm
line	O
of	O
cameras	O
.	O
</s>
<s>
The	O
17	O
–	O
40mm	O
is	O
the	O
least	O
expensive	O
of	O
Canon	O
's	O
current	O
wide-angle	O
zooms	O
for	O
full-frame	O
bodies	O
,	O
with	O
the	O
EF	B-Application
16	O
–	O
35mm	O
4L	O
IS	O
USM	O
and	O
EF	B-Application
11	O
–	O
24mm	O
4L	O
USM	O
being	O
more	O
expensive	O
,	O
and	O
the	O
EF	B-Application
16	O
–	O
35mm	O
2.8L	O
USM	O
being	O
both	O
faster	O
and	O
more	O
expensive	O
.	O
</s>
<s>
This	O
lens	O
is	O
also	O
a	O
popular	O
step	O
up	O
from	O
the	O
stock	O
kit	O
lens	O
on	O
many	O
of	O
Canon	O
's	O
EOS	B-Algorithm
Digital	O
family	O
of	O
cameras	O
,	O
the	O
EF-S	B-Algorithm
18	O
–	O
55mm	O
3.5	O
–	O
5.6	O
,	O
for	O
those	O
still	O
wanting	O
a	O
wide	O
angle	O
lens	O
.	O
</s>
<s>
In	O
this	O
role	O
,	O
it	O
is	O
compared	O
with	O
the	O
EF-S	B-Algorithm
17	I-Algorithm
–	I-Algorithm
55mm	I-Algorithm
lens	I-Algorithm
,	O
with	O
which	O
it	O
can	O
unofficially	O
share	O
lens	O
hoods	O
.	O
</s>
<s>
This	O
lens	O
is	O
often	O
paired	O
with	O
an	O
L	O
series	O
telephoto	O
lens	O
,	O
such	O
as	O
the	O
EF	B-Application
28	O
–	O
300mm	O
3.5	O
–	O
5.6	O
L	O
USM	O
or	O
any	O
of	O
the	O
EF	B-Algorithm
70	I-Algorithm
–	I-Algorithm
200mm	I-Algorithm
family	O
(	O
4L	O
USM	O
,	O
4L	O
IS	O
USM	O
,	O
2.8L	O
USM	O
,	O
2.8L	O
IS	O
USM	O
,	O
2.8L	O
IS	O
II	O
USM	O
)	O
.	O
</s>
