<s>
A	O
depth-of-field	B-Algorithm
adapter	I-Algorithm
(	O
often	O
shortened	O
to	O
DOF	B-Algorithm
adapter	I-Algorithm
)	O
is	O
used	O
to	O
achieve	O
shallow	O
depth	O
of	O
field	O
on	O
a	O
video	O
camera	O
whose	O
fixed	O
lens	O
or	O
interchangeable	O
lens	O
selection	O
is	O
limited	O
or	O
economically	O
prohibitive	O
at	O
providing	O
such	O
effect	O
.	O
</s>
<s>
A	O
DOF	B-Algorithm
adapter	I-Algorithm
could	O
theoretically	O
be	O
used	O
on	O
a	O
multitude	O
of	O
platforms	O
,	O
although	O
it	O
is	O
most	O
useful	O
on	O
prosumer	O
digital	O
camcorders	O
where	O
high	O
resolution	O
is	O
a	O
capability	O
but	O
the	O
sensor	O
size	O
is	O
still	O
small	O
enough	O
to	O
elicit	O
use	O
of	O
the	O
adapter	O
.	O
</s>
<s>
The	O
term	O
35mm	B-Algorithm
adapter	I-Algorithm
is	O
common	O
,	O
since	O
most	O
designs	O
use	O
a	O
focusing	O
screen	O
the	O
size	O
of	O
a	O
35mm	O
film	O
frame	O
(	O
24×36	O
mm	O
)	O
and	O
interface	O
with	O
lenses	O
designed	O
for	O
35mm	O
cameras	O
.	O
</s>
<s>
The	O
use	O
of	O
adapters	O
has	O
decreased	O
largely	O
due	O
to	O
the	O
video	O
function	O
available	O
on	O
newer	O
DSLR	B-Device
cameras	I-Device
.	O
</s>
<s>
A	O
DOF	B-Algorithm
adapter	I-Algorithm
focuses	O
an	O
image	O
onto	O
a	O
translucent	O
screen	O
(	O
similar	O
to	O
how	O
one	O
would	O
look	O
at	O
a	O
focused	O
image	O
through	O
a	O
system	B-Algorithm
camera	I-Algorithm
's	O
viewfinder	O
)	O
located	O
between	O
an	O
external	O
lens	O
and	O
the	O
camera	O
's	O
main	O
lens	O
.	O
</s>
<s>
A	O
DOF	B-Algorithm
adapter	I-Algorithm
comes	O
with	O
a	O
few	O
limitations	O
.	O
</s>
<s>
To	O
help	O
address	O
this	O
issue	O
while	O
filming	O
,	O
an	O
external	O
monitor	O
such	O
as	O
a	O
small	O
LCD	B-Device
screen	I-Device
may	O
be	O
mounted	O
upside	O
down	O
to	O
view	O
the	O
image	O
in	O
its	O
correct	O
orientation	O
.	O
</s>
<s>
Some	O
LCD	B-Device
screens	I-Device
feature	O
both	O
mirror	O
and	O
flip	O
options	O
that	O
correctly	O
orient	O
the	O
image	O
(	O
flip	O
vertically	O
and	O
mirror	O
horizontally	O
)	O
.	O
</s>
<s>
However	O
the	O
camera	O
LCD	B-Device
will	O
still	O
flip	O
the	O
image	O
,	O
and	O
an	O
external	O
LCD	B-Device
monitor	O
is	O
still	O
required	O
.	O
</s>
<s>
A	O
flip	O
module	O
is	O
yet	O
another	O
addition	O
to	O
35mm	B-Algorithm
adapter	I-Algorithm
construction	O
set	O
that	O
is	O
made	O
up	O
of	O
a	O
series	O
of	O
mirrors	O
or	O
prisms	O
that	O
literally	O
"	O
flip	O
"	O
the	O
image	O
while	O
shooting	O
.	O
</s>
<s>
This	O
avoids	O
the	O
burden	O
of	O
needing	O
an	O
external	O
LCD	B-Device
monitor	O
,	O
but	O
at	O
the	O
cost	O
of	O
additional	O
light	O
loss	O
.	O
</s>
<s>
A	O
basic	O
DOF	B-Algorithm
adapter	I-Algorithm
usually	O
has	O
four	O
components	O
:	O
a	O
macro	O
lens	O
,	O
an	O
optional	O
plano-convex	O
lens	O
,	O
a	O
translucent	O
focusing	O
screen	O
,	O
and	O
finally	O
a	O
photographic	O
lens	O
of	O
the	O
user	O
's	O
choice	O
.	O
</s>
<s>
The	O
price	O
of	O
a	O
DOF	B-Algorithm
adapter	I-Algorithm
ranges	O
from	O
tens	O
of	O
thousands	O
of	O
US	O
dollars	O
for	O
a	O
professional	O
solution	O
to	O
less	O
than	O
a	O
hundred	O
by	O
using	O
parts	O
available	O
from	O
a	O
local	O
hardware	O
store	O
.	O
</s>
<s>
The	O
pricing	O
of	O
a	O
DOF	B-Algorithm
adapter	I-Algorithm
unit	O
also	O
depends	O
on	O
the	O
material	O
and	O
technologies	O
used	O
.	O
</s>
