<s>
The	O
Panasonic	B-Device
Lumix	I-Device
DMC-G1	I-Device
was	O
the	O
first	O
digital	O
mirrorless	B-Device
interchangeable-lens	I-Device
camera	I-Device
(	O
MILC	B-Device
)	O
adhering	O
to	O
the	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
system	I-Operating_System
design	O
standard	O
.	O
</s>
<s>
The	O
G1	O
camera	O
is	O
similar	O
to	O
the	O
larger	O
Four	B-Architecture
Thirds	I-Architecture
system	I-Architecture
format	O
DSLR	B-Device
cameras	I-Device
,	O
but	O
replaces	O
the	O
complex	O
optical	O
path	O
needed	O
for	O
the	O
optical	O
viewfinder	O
with	O
an	O
electronic	B-Algorithm
viewfinder	I-Algorithm
EVF	B-Algorithm
displaying	O
a	O
live	B-Device
view	I-Device
image	O
directly	O
from	O
the	O
sensor	O
.	O
</s>
<s>
The	O
DMC-G1	B-Device
(	O
also	O
known	O
as	O
simply	O
the	O
"	O
G1	O
"	O
)	O
was	O
displayed	O
for	O
the	O
first	O
time	O
at	O
photokina	O
2008	O
;	O
it	O
was	O
available	O
for	O
sale	O
in	O
the	O
United	O
States	O
and	O
Europe	O
in	O
November	O
2008	O
.	O
</s>
<s>
The	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
system	I-Operating_System
standard	O
uses	O
the	O
same	O
sized	O
sensor	O
(	O
nominal	O
4000	O
pixels	O
by	O
3000	O
pixels	O
)	O
as	O
the	O
original	O
Four	B-Architecture
Thirds	I-Architecture
system	I-Architecture
.	O
</s>
<s>
One	O
advantage	O
of	O
the	O
smaller	O
MFT	B-Operating_System
system	O
sensor	O
(	O
when	O
compared	O
to	O
market	O
leaders	O
Canon	O
and	O
Nikon	O
APS-C	O
and	O
full	O
frame	O
sized	O
)	O
is	O
the	O
ability	O
to	O
engineer	O
smaller	O
and	O
lighter	O
lenses	O
since	O
the	O
smaller	O
sensor	O
allows	O
for	O
a	O
reduced	O
image	O
circle	O
.	O
</s>
<s>
The	O
G1	O
camera	O
and	O
its	O
lenses	O
are	O
smaller	O
than	O
competing	O
DSLRs	B-Device
.	O
</s>
<s>
It	O
uses	O
a	O
sophisticated	O
projection	O
system	O
to	O
achieve	O
a	O
clearer	O
,	O
smoother	O
image	O
in	O
its	O
electronic	B-Algorithm
viewfinder	I-Algorithm
than	O
in	O
compact	O
camera	O
EVFs	O
.	O
</s>
<s>
The	O
performance	O
of	O
this	O
AF	O
system	O
is	O
comparable	O
to	O
the	O
phase-detect	O
systems	O
in	O
conventional	O
DSLRs	B-Device
.	O
</s>
<s>
The	O
G1	O
was	O
packaged	O
with	O
a	O
14	O
–	O
45mm	O
ƒ/3.5	O
–	O
5.6	O
kit	O
lens	O
(	O
28	O
–	O
90mm	O
equivalent	O
)	O
and	O
can	O
use	O
all	O
native	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
System	I-Operating_System
lenses	O
regardless	O
of	O
manufacturer	O
.	O
</s>
<s>
Four	B-Architecture
Thirds	I-Architecture
System	I-Architecture
lenses	O
can	O
be	O
used	O
with	O
an	O
adapter	O
,	O
although	O
response	O
time	O
,	O
especially	O
focus	O
response	O
,	O
can	O
be	O
slower	O
.	O
</s>
<s>
Legacy	O
lenses	O
from	O
nearly	O
every	O
major	O
manual	O
focus	O
camera	O
mount	O
,	O
such	O
as	O
Leica	B-Algorithm
M	I-Algorithm
,	O
Leica	B-Algorithm
R	I-Algorithm
,	O
Olympus	B-Algorithm
OM	I-Algorithm
,	O
Nikon	B-Algorithm
F	I-Algorithm
,	O
Canon	B-Algorithm
FD	I-Algorithm
,	O
Minolta	O
SR	O
,	O
M42	B-Algorithm
Screw	I-Algorithm
Mount	I-Algorithm
,	O
Contax/Yashica	O
Mount	O
and	O
others	O
can	O
also	O
be	O
mounted	O
and	O
used	O
in	O
manual	O
mode	O
.	O
</s>
<s>
Canon	B-Application
EF	I-Application
mount	I-Application
lenses	O
can	O
be	O
used	O
with	O
an	O
adapter	O
.	O
</s>
<s>
The	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
system	I-Operating_System
specification	O
supports	O
lenses	O
with	O
optical	O
image	O
stabilization	O
.	O
</s>
<s>
In	O
many	O
ways	O
,	O
the	O
G1	O
was	O
considered	O
a	O
landmark	O
camera	O
,	O
kicking	O
off	O
a	O
new	O
market	O
for	O
mirrorless	B-Device
interchangeable	O
lens	O
system	O
cameras	O
.	O
</s>
<s>
The	O
G1	O
's	O
successor	O
model	O
is	O
the	O
Panasonic	B-Device
Lumix	I-Device
DMC-G2	I-Device
which	O
was	O
announced	O
in	O
March	O
2010	O
.	O
</s>
<s>
The	O
third	O
model	O
in	O
the	O
"	O
G	O
"	O
line	O
,	O
the	O
Panasonic	B-Device
Lumix	I-Device
DMC-G3	I-Device
,	O
was	O
announced	O
in	O
May	O
2011	O
.	O
</s>
