<s>
The	O
Canon	B-Application
EF	I-Application
28	O
–	O
135	O
3.5	O
–	O
5.6	O
IS	O
USM	O
is	O
a	O
"	O
standard	O
"	O
zoom	O
lens	O
that	O
was	O
introduced	O
in	O
February	O
,	O
1998	O
.	O
</s>
<s>
The	O
lens	O
has	O
a	O
4.82x	O
zoom	O
range	O
and	O
is	O
based	O
on	O
the	O
EF	B-Application
Lens	I-Application
Mount	I-Application
and	O
works	O
with	O
all	O
film	O
and	O
digital	O
EOS	B-Algorithm
cameras	I-Algorithm
that	O
support	O
this	O
mount	O
.	O
</s>
<s>
Although	O
labeled	O
as	O
"	O
Macro	O
"	O
on	O
the	O
lens	O
and	O
in	O
some	O
literature	O
,	O
this	O
is	O
not	O
a	O
true	O
macro	O
lens	O
and	O
cannot	O
reproduce	O
the	O
subject	O
image	O
at	O
1:1	O
ratio	O
on	O
the	O
film	O
or	O
image	O
sensor	O
,	O
as	O
with	O
the	O
Canon	B-Algorithm
EF	I-Algorithm
100mm	I-Algorithm
lens	I-Algorithm
for	O
full-frame	O
bodies	O
or	O
the	O
Canon	B-Algorithm
EF-S	I-Algorithm
60mm	I-Algorithm
f/2.8	I-Algorithm
Macro	I-Algorithm
USM	I-Algorithm
lens	I-Algorithm
for	O
EF-S	O
bodies	O
with	O
a	O
1.6	O
crop	O
factor	O
.	O
</s>
<s>
There	O
is	O
a	O
Canon	B-Algorithm
EF	I-Algorithm
50mm	I-Algorithm
lens	I-Algorithm
that	O
produces	O
a	O
1:2	O
maximum	O
image	O
ratio	O
and	O
is	O
advertised	O
as	O
a	O
"	O
compact	O
macro	O
,	O
"	O
which	O
is	O
also	O
not	O
a	O
true	O
1:1	O
macro	O
but	O
may	O
produce	O
adequate	O
results	O
in	O
some	O
applications	O
.	O
</s>
