<s>
The	O
waist-level	B-Algorithm
finder	I-Algorithm
(	O
WLF	O
)	O
,	O
also	O
called	O
waist-level	O
viewfinder	O
(	O
WLVF	O
)	O
,	O
is	O
a	O
type	O
of	O
viewfinder	O
that	O
can	O
be	O
used	O
on	O
twin	B-Algorithm
lens	I-Algorithm
and	O
single	B-Algorithm
lens	I-Algorithm
reflex	I-Algorithm
cameras	I-Algorithm
.	O
</s>
<s>
The	O
waist-level	B-Algorithm
finder	I-Algorithm
makes	O
this	O
screen	O
viewable	O
from	O
above	O
,	O
where	O
the	O
image	O
is	O
seen	O
upright	O
but	O
reversed	O
left-to-right	O
.	O
</s>
<s>
The	O
eye-level	O
finder	O
is	O
an	O
evolution	O
of	O
the	O
waist-level	B-Algorithm
finder	I-Algorithm
,	O
using	O
a	O
roof	O
pentaprism	O
or	O
pentamirror	O
to	O
correct	O
the	O
image	O
while	O
making	O
it	O
viewable	O
through	O
an	O
eyepiece	O
at	O
the	O
rear	O
of	O
the	O
camera	O
.	O
</s>
<s>
Some	O
digital	O
cameras	O
have	O
an	O
articulating	B-Device
screen	I-Device
or	O
a	O
swivel	O
lens	O
,	O
this	O
allows	O
the	O
screen	O
to	O
be	O
angled	O
to	O
make	O
it	O
viewable	O
at	O
waist-level	O
.	O
</s>
<s>
With	O
live	B-Device
preview	I-Device
the	O
screen	O
can	O
be	O
used	O
as	O
a	O
viewfinder	O
.	O
</s>
