<s>
A	O
C	O
mount	O
is	O
a	O
type	O
of	O
lens	B-Algorithm
mount	I-Algorithm
commonly	O
found	O
on	O
16	O
mm	O
movie	B-Application
cameras	I-Application
,	O
closed-circuit	O
television	O
cameras	O
,	O
machine	B-General_Concept
vision	I-General_Concept
cameras	O
and	O
microscope	O
phototubes	O
.	O
</s>
<s>
Some	O
TV	O
lenses	O
lack	O
provision	O
to	O
focus	O
or	O
vary	O
the	O
aperture	O
,	O
so	O
may	O
not	O
operate	O
properly	O
with	O
film	B-Application
cameras	I-Application
.	O
</s>
<s>
Also	O
,	O
some	O
TV	O
lenses	O
may	O
have	O
bits	O
that	O
protrude	O
behind	O
the	O
mount	O
far	O
enough	O
to	O
interfere	O
with	O
the	O
shutter	O
or	O
reflex	O
finder	O
mechanisms	O
of	O
a	O
film	B-Application
camera	I-Application
.	O
</s>
<s>
Although	O
C-mount	O
lenses	O
have	O
a	O
back	O
focal	O
distance	O
far	O
too	O
short	O
to	O
be	O
used	O
with	O
35mm	O
film	O
SLRs	O
or	O
any	O
existing	O
digital	O
SLR	O
(	O
except	O
some	O
mirrorless	B-Device
cameras	I-Device
,	O
e.g.	O
</s>
<s>
Canon	B-Algorithm
EOS	I-Algorithm
M	I-Algorithm
)	O
,	O
they	O
can	O
be	O
mounted	O
on	O
interchangeable-lens	O
mirrorless	B-Device
digital	I-Device
cameras	I-Device
such	O
as	O
the	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
used	O
by	O
Olympus	O
and	O
Panasonic	O
.	O
</s>
<s>
The	O
Nikon	B-Algorithm
1	I-Algorithm
series	I-Algorithm
and	O
the	O
Pentax	B-Device
Q	I-Device
series	I-Device
can	O
use	O
C-mount	O
lenses	O
without	O
vignetting	O
.	O
</s>
<s>
C	O
mount	O
was	O
created	O
by	O
Bell	O
&	O
Howell	O
for	O
their	O
Filmo	O
70	O
cine	B-Application
cameras	I-Application
.	O
</s>
<s>
Soon	O
after	O
,	O
other	O
camera	O
manufacturers	O
adopted	O
the	O
same	O
mount	O
,	O
and	O
it	O
became	O
a	O
de	O
facto	O
standard	O
for	O
16mm	O
cine	B-Application
cameras	I-Application
.	O
</s>
