<s>
The	O
Sony	B-Algorithm
Alpha	I-Algorithm
a550	O
(	O
DSLR-A550	O
)	O
is	O
a	O
midrange-level	O
digital	B-Device
single-lens	I-Device
reflex	I-Device
camera	I-Device
(	O
DSLR	B-Device
)	O
marketed	O
by	O
Sony	O
and	O
aimed	O
at	O
enthusiasts	O
,	O
it	O
was	O
released	O
in	O
August	O
2009	O
.	O
</s>
<s>
The	O
camera	O
features	O
a	O
14.2	O
megapixel	O
APS-C	B-Algorithm
Type	O
CMOS	B-Device
Exmor	I-Device
Sensor	O
and	O
features	O
Sony	O
's	O
patented	O
SteadyShot	O
INSIDE	O
stabilisation	O
system	O
which	O
works	O
with	O
any	O
attached	O
lens	O
.	O
</s>
<s>
The	O
Sony	B-Algorithm
Alpha	I-Algorithm
a550	O
's	O
main	O
selling	O
point	O
is	O
its	O
dual	O
Live	B-Device
View	I-Device
mode	O
's	O
,	O
Sony	O
's	O
normal	O
secondary	O
;	O
smaller	O
sensor	O
based	O
Live	B-Device
View	I-Device
mode	O
and	O
another	O
which	O
uses	O
the	O
main	O
sensor	O
with	O
no	O
autofocus	O
.	O
</s>
<s>
The	O
Sony	B-Algorithm
Alpha	I-Algorithm
a550	O
is	O
"	O
big	O
brother	O
"	O
to	O
the	O
Sony	B-Device
Alpha	I-Device
a500	I-Device
,	O
an	O
almost	O
identical	O
DSLR	B-Device
with	O
a	O
smaller	O
12.3	O
megapixel	O
APS-C	B-Algorithm
CMOS	B-Architecture
sensor	I-Architecture
,	O
no	O
7frame/s	O
continuous	O
shooting	O
and	O
a	O
lower	O
resolution	O
LCD	B-Device
.	O
</s>
<s>
The	O
a550	O
stands	O
out	O
from	O
other	O
DSLR	B-Device
's	O
in	O
its	O
price	O
range	O
with	O
its	O
use	O
of	O
2	O
separate	O
Live	B-Device
View	I-Device
modes	O
.	O
</s>
<s>
The	O
first	O
mode	O
operates	O
in	O
the	O
same	O
way	O
other	O
DSLR	B-Device
's	O
do	O
,	O
by	O
switching	O
from	O
using	O
the	O
main	O
sensor	O
to	O
using	O
a	O
secondary	O
,	O
smaller	O
sensor	O
.	O
</s>
<s>
This	O
allows	O
the	O
a550	O
to	O
autofocus	O
in	O
its	O
first	O
Live	B-Device
View	I-Device
mode	O
.	O
</s>
<s>
The	O
second	O
Live	B-Device
View	I-Device
mode	O
is	O
named	O
Manual	O
Focus	O
Check	O
Live	B-Device
View	I-Device
.	O
</s>
<s>
This	O
mode	O
uses	O
the	O
main	O
14.2	O
megapixel	O
APS-C	B-Algorithm
Type	O
CMOS	B-Device
Exmor	I-Device
Sensor	O
to	O
provide	O
a	O
100%	O
view	O
on	O
the	O
rear	O
LCD	B-Device
.	O
</s>
<s>
This	O
mode	O
does	O
not	O
allow	O
auto	O
focusing	O
,	O
hence	O
the	O
name	O
Manual	O
Focus	O
Check	O
Live	B-Device
View	I-Device
.	O
</s>
<s>
When	O
in	O
Live	B-Device
View	I-Device
mode	O
the	O
a550	O
uses	O
its	O
3.0	O
TFT	O
Xtra	O
Fine	O
LCD	B-Device
,	O
with	O
921,600	O
dots	O
which	O
can	O
be	O
adjusted	O
to	O
point	O
downwards	O
,	O
for	O
overhead	O
shooting	O
or	O
upwards	O
for	O
below	O
eye	O
level	O
shooting	O
.	O
</s>
<s>
When	O
Live	B-Device
View	I-Device
mode	O
is	O
not	O
in	O
use	O
the	O
optical	O
viewfinder(OVF )	O
is	O
used	O
and	O
only	O
provides	O
95%	O
coverage	O
of	O
the	O
actual	O
image	O
taken	O
by	O
the	O
sensor	O
.	O
</s>
<s>
The	O
a550	O
uses	O
a	O
14.2	O
megapixel	O
APS-C	B-Algorithm
Type	O
CMOS	B-Device
Exmor	I-Device
Sensor	O
.	O
</s>
<s>
It	O
is	O
a	O
23.4	O
x	O
15.6mm	O
APS-C	B-Algorithm
Type	O
CMOS	B-Device
Exmor	I-Device
Sensor	O
with	O
an	O
RGB	O
Color	O
Filter	O
Array	O
,	O
Built-in	O
fixed	O
low-pass	O
filter	O
,	O
with	O
14.6	O
million	O
total	O
pixels	B-Algorithm
and	O
14.2	O
million	O
effective	O
pixels	B-Algorithm
.	O
</s>
<s>
The	O
Sony	B-Algorithm
Alpha	I-Algorithm
a550	O
incorporates	O
Sony	O
's	O
patented	O
SteadyShot	O
INSIDE	O
stabilization	O
system	O
which	O
works	O
with	O
any	O
attached	O
lens	O
.	O
</s>
