<s>
Single-lens	B-Device
translucent	I-Device
(	O
SLT	O
)	O
is	O
a	O
Sony	O
proprietary	O
designation	O
for	O
Sony	B-Algorithm
Alpha	I-Algorithm
cameras	O
which	O
employ	O
a	O
pellicle	B-Algorithm
mirror	I-Algorithm
,	O
electronic	B-Algorithm
viewfinder	I-Algorithm
,	O
and	O
phase-detection	O
autofocus	O
system	O
.	O
</s>
<s>
They	O
employ	O
the	O
same	O
Minolta	B-Algorithm
A-mount	I-Algorithm
as	O
Sony	B-Algorithm
Alpha	I-Algorithm
DSLR	B-Device
cameras	I-Device
.	O
</s>
<s>
Sony	B-Device
SLT	I-Device
cameras	I-Device
have	O
a	O
semi-transparent	O
fixed	O
mirror	O
which	O
diverts	O
a	O
portion	O
of	O
incoming	O
light	O
to	O
a	O
phase-detection	O
autofocus	O
sensor	O
,	O
while	O
the	O
remaining	O
light	O
strikes	O
a	O
digital	B-Algorithm
image	I-Algorithm
sensor	I-Algorithm
.	O
</s>
<s>
The	O
image	B-Algorithm
sensor	I-Algorithm
feeds	O
the	O
electronic	B-Algorithm
viewfinder	I-Algorithm
,	O
and	O
also	O
records	O
still	O
images	O
and	O
video	O
on	O
command	O
.	O
</s>
<s>
The	O
utility	O
of	O
the	O
SLT	O
design	O
is	O
to	O
allow	O
full-time	O
phase-detection	O
autofocus	O
during	O
electronic	B-Algorithm
viewfinder	I-Algorithm
,	O
live	B-Device
view	I-Device
,	O
and	O
video	O
recording	O
operation	O
.	O
</s>
<s>
With	O
the	O
advent	O
of	O
digital	B-Algorithm
image	I-Algorithm
sensors	I-Algorithm
with	O
integrated	O
phase-detection	O
,	O
the	O
SLT	O
design	O
is	O
no	O
longer	O
required	O
to	O
accomplish	O
this	O
goal	O
,	O
as	O
evidenced	O
by	O
cameras	O
such	O
as	O
the	O
Sony	O
NEX-5R	O
,	O
Fujifilm	O
X-100s	O
,	O
and	O
Nikon	B-Algorithm
1	I-Algorithm
,	O
although	O
the	O
SLT	O
design	O
avoids	O
having	O
pixels	O
unavailable	O
for	O
image	O
formation	O
due	O
to	O
their	O
space	O
on	O
the	O
sensor	O
being	O
occupied	O
by	O
a	O
dedicated	O
phase	O
detection	O
autofocus	O
sensor	O
.	O
</s>
<s>
The	O
term	O
"	O
translucent	O
"	O
is	O
a	O
misnomer	O
for	O
the	O
actual	O
SLT	O
design	O
,	O
which	O
employs	O
a	O
pellicle	B-Algorithm
mirror	I-Algorithm
that	O
is	O
not	O
translucent	O
.	O
</s>
<s>
Pellicle	B-Algorithm
mirrors	I-Algorithm
have	O
been	O
used	O
in	O
single-lens	B-Algorithm
reflex	I-Algorithm
cameras	I-Algorithm
from	O
at	O
least	O
the	O
1960s	O
(	O
see	O
Canon	B-Algorithm
Pellix	I-Algorithm
)	O
and	O
in	O
the	O
Pentax	O
EI2000/Hewlett	O
Packard	O
912	O
digital	B-Device
SLR	I-Device
of	O
2000	O
which	O
used	O
an	O
optical	O
viewfinder	O
and	O
on-sensor	O
contrast-detection	O
focussing	O
.	O
</s>
<s>
All	O
of	O
the	O
above	O
cameras	O
record	O
1920x1080	O
video	O
at	O
60i/30p	O
(	O
NTSC	O
regions	O
)	O
or	O
50i/25p	O
(	O
PAL	O
regions	O
)	O
,	O
in	O
MPEG-4	B-Algorithm
,	O
AVCHD	O
or	O
H.264	B-Application
formats	O
.	O
</s>
