<s>
The	O
Canon	O
EF-M	O
was	O
a	O
manual-focus	O
35mm	O
film	O
,	O
SLR	B-Algorithm
camera	I-Algorithm
which	O
used	O
the	O
Canon	B-Application
EF	I-Application
lens	I-Application
mount	I-Application
.	O
</s>
<s>
It	O
was	O
not	O
sold	O
as	O
part	O
of	O
the	B-Algorithm
EOS	I-Algorithm
range	I-Algorithm
;	O
the	O
camera	O
's	O
official	O
name	O
was	O
Canon	O
EF-M	O
rather	O
than	O
Canon	B-Algorithm
EOS	I-Algorithm
EF-M	O
.	O
</s>
<s>
The	O
EF-M	O
was	O
in	O
essence	O
a	O
Canon	B-Algorithm
EOS	I-Algorithm
1000	O
without	O
an	O
autofocus	O
system	O
,	O
a	O
built-in	O
flash	O
,	O
or	O
a	O
top-deck	O
LCD	O
.	O
</s>
<s>
Uniquely	O
amongst	O
Canon	B-Algorithm
EOS	I-Algorithm
bodies	O
it	O
came	O
with	O
an	O
optical	O
manual	O
focus	O
aid	O
,	O
a	O
split-image	O
focusing	O
screen	O
as	O
well	O
as	O
a	O
ring	O
of	O
microprisms	O
.	O
</s>
<s>
This	O
system	O
was	O
common	O
with	O
manual	O
focus	O
SLRs	B-Algorithm
but	O
had	O
since	O
fallen	O
out	O
of	O
use	O
in	O
the	O
autofocus	O
era	O
.	O
</s>
