<s>
Panasonic	B-Device
Lumix	I-Device
DMC-GF1	I-Device
was	O
introduced	O
in	O
September	O
2009	O
as	O
the	O
third	O
camera	O
in	O
Panasonic	O
's	O
LumixG-series	O
,	O
using	O
the	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
system	I-Operating_System
.	O
</s>
<s>
It	O
was	O
the	O
first	O
model	O
in	O
the	O
"	O
GF	O
"	O
line	O
,	O
which	O
is	O
primarily	O
distinguished	O
from	O
the	O
other	O
Lumix	B-Device
G	O
cameras	O
by	O
the	O
lack	O
of	O
an	O
integrated	O
electronic	O
viewfinder	O
.	O
</s>
<s>
The	O
design	O
of	O
the	O
DMC-GF1	B-Device
is	O
similar	O
to	O
that	O
of	O
the	O
Olympus	B-Algorithm
E-P1	I-Algorithm
which	O
was	O
introduced	O
a	O
few	O
months	O
earlier	O
.	O
</s>
<s>
It	O
has	O
the	O
same	O
12.1	O
megapixel	O
sensor	O
as	O
the	O
DMC-G1	B-Device
,	O
1280×720HD	O
recording	O
in	O
AVCHD	O
Lite	O
format	O
,	O
an	O
optional	O
hot-shoe	O
mounted	O
electronic	O
viewfinder	O
,	O
and	O
a	O
3-inch	O
LCD	O
with	O
460,000	O
dots	O
.	O
</s>
<s>
This	O
model	O
in	O
the	O
Lumix	B-Device
range	O
was	O
claimed	O
by	O
Panasonic	O
as	O
the	O
world	O
's	O
smallest	O
and	O
lightest	O
system	O
digital	O
camera	O
with	O
a	O
built-in	O
flash	O
capability	O
.	O
</s>
<s>
The	O
GF1	O
's	O
successor	O
,	O
the	O
Panasonic	B-Device
Lumix	I-Device
DMC-GF2	I-Device
was	O
announced	O
in	O
November	O
2010	O
.	O
</s>
<s>
The	O
GF	O
line	O
has	O
since	O
been	O
extended	O
with	O
the	O
Panasonic	B-Device
Lumix	I-Device
DMC-GF3	I-Device
(	O
announced	O
in	O
June	O
2011	O
)	O
,	O
the	O
Panasonic	B-Device
Lumix	I-Device
DMC-GF5	I-Device
(	O
announced	O
in	O
April	O
2012	O
)	O
and	O
the	O
Panasonic	B-Algorithm
Lumix	I-Algorithm
DMC-GF6	I-Algorithm
(	O
announced	O
in	O
April	O
2013	O
)	O
.	O
</s>
<s>
Many	O
enthusiasts	O
decried	O
the	O
move	O
away	O
from	O
the	O
GF1	O
's	O
button	O
driven	O
interface	O
and	O
the	O
omission	O
of	O
the	O
top	O
control	O
dial	O
in	O
the	O
GF2	B-Device
and	O
subsequent	O
models	O
.	O
</s>
<s>
Because	O
of	O
this	O
some	O
feel	O
that	O
the	O
Panasonic	B-Algorithm
Lumix	I-Algorithm
DMC-GX1	I-Algorithm
is	O
the	O
GF1	O
's	O
"	O
spiritual	O
successor	O
"	O
.	O
</s>
