<s>
The	O
Canon	B-Algorithm
EF-S	I-Algorithm
10	O
–	O
22mm	O
3.5	O
–	O
4.5	O
USM	O
lens	O
is	O
a	O
wide	O
to	O
ultra-wide	O
angle	O
zoom	O
lens	O
for	O
Canon	O
digital	B-Device
single-lens	I-Device
reflex	I-Device
cameras	I-Device
with	O
a	O
Canon	B-Algorithm
EF-S	I-Algorithm
lens	I-Algorithm
mount	I-Algorithm
.	O
</s>
<s>
The	O
field	O
of	O
view	O
has	O
a	O
35	O
mm	O
equivalent	O
focal	O
length	O
of	O
16	O
–	O
35mm	O
,	O
which	O
is	O
analogous	O
to	O
the	O
EF	O
16	O
–	O
35mm	O
2.8L	O
on	O
a	O
full-frame	B-Algorithm
camera	O
.	O
</s>
<s>
The	O
optical	O
construction	O
is	O
similar	O
to	O
L-series	O
lenses	O
,	O
but	O
it	O
is	O
not	O
designated	O
as	O
L-series	O
(	O
as	O
reflected	O
in	O
the	O
build	O
quality	O
)	O
,	O
which	O
some	O
have	O
argued	O
is	O
for	O
marketing	O
reasons	O
,	O
as	O
with	O
the	O
17	B-Algorithm
–	I-Algorithm
55	I-Algorithm
.	O
</s>
<s>
Cost	O
is	O
the	O
biggest	O
criticism	O
;	O
until	O
fairly	O
recently	O
,	O
the	O
10	O
–	O
22	O
cost	O
as	O
much	O
as	O
many	O
L-series	O
lenses	O
,	O
but	O
is	O
only	O
usable	O
on	O
APS-C	B-Algorithm
cameras	O
,	O
and	O
thus	O
is	O
questionable	O
as	O
a	O
long-term	O
investment	O
.	O
</s>
<s>
In	O
May	O
2014	O
,	O
Canon	O
announced	O
a	O
less	O
expensive	O
alternative	O
wide-angle	O
zoom	O
for	O
APS-C	B-Algorithm
bodies	O
,	O
the	O
EF-S	B-Algorithm
10	I-Algorithm
–	I-Algorithm
18mm	I-Algorithm
.	O
</s>
<s>
Sigma	O
offers	O
two	O
ultra-wide	O
angle	O
lenses	O
for	O
APS-C	B-Algorithm
sensors	O
—	O
the	O
8	O
–	O
16	O
DC	O
and	O
10	O
–	O
20DC	O
.	O
</s>
<s>
Tamron	O
also	O
offers	O
a	O
10	O
–	O
24mm	O
ultra-wide	O
zoom	O
lens	O
for	O
APS-C	B-Algorithm
cameras	O
as	O
well	O
as	O
an	O
older	O
11	O
–	O
18mm	O
lens	O
.	O
</s>
<s>
In	O
May	O
2008	O
,	O
"	O
PhotoZone	O
"	O
considered	O
the	O
Tokina	O
11	O
–	O
16mm	O
,	O
f/2.8	O
,	O
introduced	O
in	O
2008	O
,	O
to	O
be	O
the	O
best	O
ultra-wide	O
angle	O
lens	O
available	O
for	O
Canon	O
APS-C	B-Algorithm
Format	O
cameras	O
.	O
</s>
