<s>
The	O
Canon	B-Algorithm
EF-M	I-Algorithm
lens	I-Algorithm
mount	I-Algorithm
,	O
introduced	O
in	O
2012	O
,	O
is	O
a	O
derivative	O
of	O
the	O
Canon	B-Application
EF	I-Application
lens	I-Application
mount	I-Application
designed	O
for	O
use	O
with	O
the	O
Canon	B-Algorithm
EOS	I-Algorithm
M	I-Algorithm
mirrorless	B-Device
interchangeable-lens	I-Device
camera	I-Device
.	O
</s>
<s>
The	O
EF-M	B-Algorithm
lens	I-Algorithm
mount	O
is	O
one	O
of	O
Canon	O
's	O
two	O
new	O
systems	O
for	O
mirrorless	B-Device
cameras	I-Device
,	O
the	O
other	O
being	O
the	O
RF	B-Algorithm
mount	I-Algorithm
.	O
</s>
<s>
The	O
M	O
system	O
has	O
an	O
18mm	O
flange	O
focal	O
distance	O
(	O
compared	O
to	O
20mm	O
for	O
RF	O
and	O
44mm	O
for	O
EF	O
and	O
EF-S	B-Algorithm
)	O
and	O
a	O
47mm	O
throat	O
diameter	O
(	O
compared	O
to	O
54mm	O
for	O
EF	O
,	O
EF-S	B-Algorithm
,	O
and	O
RF	O
)	O
.	O
</s>
<s>
As	O
it	O
is	O
designed	O
for	O
use	O
with	O
an	O
APS-C-sized	O
image	B-Algorithm
sensor	I-Algorithm
,	O
it	O
features	O
the	O
same	O
crop	O
factor	O
(	O
of	O
roughly	O
1.6	O
)	O
as	O
the	O
existing	O
EF-S	B-Algorithm
lens	I-Algorithm
mount	O
.	O
</s>
<s>
There	O
is	O
a	O
lack	O
of	O
native	O
lenses	O
with	O
a	O
large	O
aperture	B-General_Concept
,	O
the	O
exceptions	O
being	O
22mm	O
2.0	O
and	O
32mm	O
1.4	O
.	O
</s>
<s>
In	O
addition	O
,	O
it	O
is	O
possible	O
to	O
use	O
Canon	B-Application
EF	I-Application
and	O
EF-S	B-Algorithm
lenses	I-Algorithm
(	O
made	O
for	O
the	O
Canon	O
DSLRs	O
)	O
with	O
an	O
adapter	O
.	O
</s>
<s>
Suitable	O
adapters	O
(	O
from	O
EF	O
to	O
M	O
or	O
from	O
EF-S	B-Algorithm
to	O
M	O
)	O
are	O
made	O
by	O
Canon	O
as	O
well	O
as	O
third	O
party	O
manufacturers	O
.	O
</s>
<s>
As	O
is	O
common	O
with	O
mirrorless	B-Device
systems	O
,	O
the	O
adapter	O
solution	O
is	O
not	O
backwards-compatible	O
with	O
Canon	O
's	O
DSLR	O
cameras	O
:	O
this	O
means	O
that	O
you	O
cannot	O
put	O
M	O
lenses	O
on	O
a	O
non-M	O
DSLR	O
.	O
</s>
