<s>
The	O
Panasonic	B-Device
Lumix	I-Device
DMC-GH1	I-Device
is	O
a	O
digital	O
mirrorless	B-Device
interchangeable	I-Device
lens	I-Device
camera	I-Device
adhering	O
to	O
the	O
Olympus	O
and	O
Panasonic	O
developed	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
System	I-Operating_System
(	O
MFT	O
)	O
system	O
design	O
standard	O
.	O
</s>
<s>
Panasonic	O
classified	O
the	O
GH1	O
as	O
a	O
hybrid	O
stills/video	O
camera	O
and	O
the	O
GH1	O
was	O
introduced	O
and	O
marketed	O
as	O
a	O
higher	O
end	O
camera	O
than	O
Panasonic	O
's	O
first	O
MFT	O
camera	O
,	O
the	O
stills	O
only	O
,	O
non-video	O
capable	O
Lumix	B-Device
DMC-G1	I-Device
.	O
</s>
<s>
The	O
Panasonic	B-Device
Lumix	I-Device
DMC-GH1	I-Device
was	O
the	O
second	O
MFT	O
camera	O
introduced	O
under	O
the	O
MFT	O
design	O
standard	O
and	O
the	O
first	O
MFT	O
camera	O
to	O
include	O
HD	O
video	O
recording	O
capability	O
.	O
</s>
<s>
When	O
announced	O
in	O
March	O
2009	O
,	O
the	O
Panasonic	B-Device
Lumix	I-Device
DMC-GH1	I-Device
was	O
marketed	O
as	O
a	O
new	O
class	O
of	O
"	O
Creative	O
HD	O
Hybrid	O
"	O
camera	O
,	O
and	O
as	O
Panasonic	O
's	O
top-of-the-line	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
(	O
MFT	O
)	O
system	O
camera	O
.	O
</s>
<s>
The	O
resulting	O
GH1	O
camera	O
was	O
a	O
smaller	O
and	O
lighter	O
interchangeable	O
lens	O
camera	O
when	O
compared	O
with	O
traditional	O
Digital	B-Device
Single	I-Device
Lens	I-Device
Reflex	I-Device
(	O
DSLR	B-Device
)	O
s	O
.	O
Like	O
a	O
DSLR	B-Device
,	O
the	O
GH1	O
design	O
follows	O
the	O
interchangeable	O
lens	O
DSLR	B-Device
form	O
and	O
function	O
instead	O
of	O
the	O
more	O
traditional	O
handheld	O
consumer	O
video	O
camcorder	O
form	O
and	O
function	O
.	O
</s>
<s>
Unlike	O
the	O
DSLR	B-Device
,	O
the	O
GH1	O
,	O
eliminated	O
the	O
bulky	O
mirror	O
box	O
and	O
pentaprism	O
assembly	O
in	O
favour	O
of	O
a	O
high	O
resolution	O
electronic	B-Algorithm
viewfinder	I-Algorithm
(	O
EVF	O
)	O
,	O
allowing	O
smaller	O
,	O
lighter	O
overall	O
body	O
size	O
and	O
the	O
use	O
of	O
new	O
,	O
smaller	O
and	O
lighter	O
weight	O
lens	O
designs	O
.	O
</s>
<s>
At	O
first	O
glance	O
,	O
the	O
GH1	O
appeared	O
to	O
be	O
just	O
a	O
video	O
capable	O
version	O
of	O
the	O
world	O
's	O
first	O
MFT	O
system	O
camera	O
,	O
the	O
Panasonic	B-Device
Lumix	I-Device
DMC-G1	I-Device
mirrorless	B-Device
interchangeable	I-Device
lens	I-Device
camera	I-Device
,	O
first	O
introduced	O
in	O
September	O
2008	O
In	O
fact	O
,	O
there	O
were	O
many	O
distinguishing	O
features	O
that	O
made	O
the	O
GH1	O
a	O
unique	O
,	O
and	O
perhaps	O
even	O
a	O
ground	O
breaking	O
product	O
.	O
</s>
<s>
Some	O
of	O
these	O
features	O
,	O
as	O
well	O
as	O
some	O
that	O
appeared	O
on	O
the	O
DMC-G1	B-Device
are	O
discussed	O
below	O
including	O
a	O
new	O
multi-aspect	O
image	O
ratio	O
sensor	O
,	O
full	O
AVCHD	O
HD	O
video	O
capability	O
,	O
stereo	O
sound	O
recording	O
,	O
dual	O
CPU	O
image	O
processing	O
,	O
and	O
a	O
super	O
zoom	O
lens	O
optimized	O
for	O
video	O
.	O
</s>
<s>
Panasonic	O
first	O
pioneered	O
the	O
concept	O
of	O
a	O
multi-aspect	O
ratio	O
image	O
sensor	O
in	O
its	O
high-end	O
compact	B-Algorithm
camera	I-Algorithm
,	O
the	O
2008	O
Panasonic	B-Algorithm
Lumix	I-Algorithm
DMC-LX3	I-Algorithm
which	O
used	O
a	O
much	O
smaller	O
1/1.63	O
"	O
CCD	B-Algorithm
technology	O
sensor	O
.	O
</s>
<s>
Building	O
on	O
the	O
multi-aspect	O
ratio	O
sensor	O
concept	O
,	O
the	O
HD	O
video	O
capable	O
GH1	O
was	O
designed	O
around	O
a	O
much	O
larger	O
four	B-Architecture
thirds	I-Architecture
sized	O
sensor	O
(	O
about	O
four	O
times	O
more	O
area	O
)	O
;	O
a	O
unique	O
14.0	O
megapixel	O
(	O
12.1	O
megapixel	O
effective	O
)	O
Live	B-Algorithm
MOS	I-Algorithm
sensor	I-Algorithm
.	O
</s>
<s>
On	O
the	O
other	O
hand	O
,	O
most	O
DSLRs	B-Device
crop	O
their	O
3:2	O
native	O
image	O
aspect	O
ratio	O
on	O
the	O
top	O
and	O
the	O
bottom	O
to	O
achieve	O
16:9	O
,	O
or	O
in	O
some	O
cases	O
,	O
crop	O
the	O
3:2	O
native	O
image	O
on	O
either	O
side	O
to	O
achieve	O
4:3	O
images	O
.	O
</s>
<s>
All	O
still	O
or	O
video/sound	O
recording	O
is	O
to	O
a	O
SD	B-Device
or	O
SDHC	O
memory	B-Device
card	I-Device
.	O
</s>
<s>
The	O
user	O
is	O
also	O
able	O
to	O
manually	O
select	O
shutter	O
speed	O
and	O
aperture	B-General_Concept
openings	O
for	O
more	O
creative	O
control	O
over	O
HD	O
video	O
recording	O
.	O
</s>
<s>
In	O
the	O
United	O
States	O
,	O
the	O
HD	O
video	O
recording	O
length	O
is	O
limited	O
to	O
the	O
capacity	O
of	O
the	O
memory	B-Device
card	I-Device
(	O
or	O
the	O
battery	O
life	O
,	O
unless	O
the	O
AC	O
power	O
adapter	O
is	O
used	O
)	O
.	O
</s>
<s>
File	O
sizes	O
are	O
no	O
larger	O
than	O
4	O
GB	O
due	O
to	O
the	O
SDHC	O
file	B-Application
allocation	I-Application
table	I-Application
limits	O
,	O
but	O
the	O
video	O
will	O
be	O
seamless	O
between	O
files	O
.	O
</s>
<s>
This	O
dual	O
CPU	O
greatly	O
speeds	O
up	O
HD	O
image	O
processing	O
and	O
offers	O
a	O
number	O
of	O
other	O
advantages	O
,	O
including	O
improved	O
image	O
noise	O
reduction	O
performance	O
,	O
ability	O
to	O
display	O
a	O
live	B-Device
view	I-Device
direct	O
from	O
the	O
sensor	O
for	O
either	O
the	O
fully	O
articulated	O
LCD	B-Device
display	I-Device
on	O
the	O
camera	O
back	O
or	O
the	O
high	O
resolution	O
electronic	O
view	O
finder	O
,	O
a	O
very	O
fast	O
contrast	O
detect	O
auto	O
focus	O
system	O
,	O
and	O
even	O
the	O
ability	O
to	O
output	O
both	O
images	O
and	O
sound	O
via	O
HDMI	B-Protocol
directly	O
from	O
the	O
camera	O
.	O
</s>
<s>
At	O
the	O
time	O
of	O
introduction	O
,	O
the	O
dual	O
processor	O
Venus	O
Engine	O
HD	O
also	O
allowed	O
what	O
was	O
claimed	O
to	O
be	O
the	O
fastest	O
contrast	O
detect	O
autofocus	O
ability	O
at	O
the	O
time	O
,	O
in	O
addition	O
to	O
the	O
implementation	O
of	O
a	O
live	B-Device
view	I-Device
electronic	B-Algorithm
viewfinder	I-Algorithm
with	O
DSLR	B-Device
like	O
functionality	O
,	O
but	O
without	O
the	O
penalty	O
of	O
a	O
complex	O
and	O
bulky	O
mirror	O
box	O
and	O
pentaprism	O
.	O
</s>
<s>
Traditional	O
digital	B-Device
single-lens	I-Device
reflex	I-Device
cameras	I-Device
(	O
DSLRs	B-Device
)	O
,	O
typified	O
by	O
Canon	B-Algorithm
EOS	I-Algorithm
or	O
Nikon	B-Algorithm
FX	I-Algorithm
or	O
DX	O
offerings	O
use	O
Phase	O
Detect	O
Auto	O
Focus	O
(	O
PDAF	O
)	O
systems	O
.	O
</s>
<s>
When	O
used	O
in	O
Live	B-Device
view	I-Device
mode	O
,	O
especially	O
for	O
video	O
,	O
traditional	O
DSLR	B-Device
's	O
must	O
rely	O
on	O
direct	O
output	O
from	O
the	O
main	O
image	O
sensor	O
in	O
order	O
to	O
autofocus	O
.	O
</s>
<s>
CDAF	O
as	O
implemented	O
in	O
contemporary	O
,	O
traditional	O
DSLR	B-Device
's	O
was	O
so	O
slow	O
as	O
to	O
be	O
almost	O
unusable	O
for	O
all	O
but	O
non-moving	O
objects	O
.	O
</s>
<s>
Designed	O
from	O
ground	O
up	O
as	O
a	O
live	B-Device
view	I-Device
,	O
CDAF	O
camera	O
,	O
and	O
not	O
as	O
an	O
"	O
add	O
on	O
"	O
auto	O
focus	O
system	O
for	O
a	O
primarily	O
PDAF	O
centric	O
camera	O
,	O
the	O
GH1	O
CDAF	O
system	O
breaks	O
new	O
ground	O
for	O
an	O
interchangeable	O
lens	O
camera	O
.	O
</s>
<s>
In	O
combination	O
with	O
other	O
features	O
,	O
including	O
a	O
23	O
area	O
AF	O
,	O
user	O
selectable	O
single	O
AF	O
point	O
anywhere	O
in	O
the	O
frame	O
,	O
subject	O
tracking	O
AF	O
and	O
facial	O
recognition	O
AF	O
,	O
the	O
dual	O
CPU	O
equipped	O
GH1	O
offered	O
the	O
fastest	O
and	O
most	O
comprehensive	O
CDAF	O
system	O
available	O
at	O
the	O
time	O
in	O
a	O
consumer	O
camera	O
,	O
on	O
par	O
in	O
most	O
performance	O
areas	O
with	O
similar	O
entry	O
level	O
to	O
mid-level	O
priced	O
contemporary	O
DSLRs	B-Device
.	O
</s>
<s>
HD	O
video	O
mode	O
also	O
uses	O
this	O
purpose-designed	O
contrast-detect	O
AF	O
system	O
,	O
making	O
the	O
GH1	O
the	O
only	O
DSLR	B-Device
styled	O
camera	O
at	O
the	O
time	O
available	O
to	O
offer	O
continuous	O
autofocusing	O
while	O
shooting	O
video	O
.	O
</s>
<s>
The	O
GH1	O
implementation	O
of	O
Face	O
Recognition	O
was	O
an	O
improvement	O
of	O
the	O
concept	O
first	O
introduced	O
in	O
2007	O
on	O
the	O
high	O
end	O
Panasonic	B-Algorithm
Lumix	I-Algorithm
DMC-L10	I-Algorithm
Four	B-Architecture
Thirds	I-Architecture
(	O
not	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
)	O
DSLR	B-Device
camera	I-Device
.	O
</s>
<s>
The	O
GH1	O
uses	O
a	O
high	O
resolution	O
(	O
1.44	O
million	O
dots	O
)	O
electronic	B-Algorithm
viewfinder	I-Algorithm
(	O
EVF	O
)	O
,	O
a	O
sophisticated	O
projection	O
system	O
to	O
achieve	O
a	O
clearer	O
,	O
smoother	O
display	O
than	O
that	O
of	O
compact	B-Algorithm
camera	I-Algorithm
EVFs	O
.	O
</s>
<s>
The	O
high	O
resolution	O
electronic	B-Algorithm
viewfinder	I-Algorithm
uses	O
a	O
technology	O
known	O
as	O
LCOS	B-Device
,	O
the	O
same	O
technology	O
used	O
in	O
Panasonic	O
's	O
professional	O
high	O
end	O
video	O
cameras	O
,	O
and	O
is	O
supposed	O
to	O
be	O
capable	O
of	O
much	O
higher	O
resolution	O
than	O
either	O
LCD	B-Device
or	O
plasma	O
display	O
technologies	O
.	O
</s>
<s>
As	O
implemented	O
in	O
the	O
GH1	O
,	O
the	O
effect	O
is	O
60	O
frame/s	O
full-time	O
live	B-Device
view	I-Device
with	O
no	O
visible	O
pixels	O
for	O
an	O
image	O
as	O
large	O
or	O
larger	O
,	O
and	O
brighter	O
than	O
competing	O
optical	O
viewfinders	O
using	O
a	O
mirror	O
box	O
and	O
pentaprism	O
than	O
most	O
prosumer	O
DSLR	B-Device
's	O
.	O
</s>
<s>
This	O
magnified	O
portion	O
may	O
be	O
moved	O
around	O
to	O
any	O
section	O
of	O
the	O
live	B-Device
view	I-Device
.	O
</s>
<s>
The	O
MFT	O
system	O
standard	O
specifies	O
the	O
lens	O
mount	O
flange	O
to	O
image	O
sensor	O
plane	O
distance	O
(	O
flange	O
focal	O
distance	O
)	O
as	O
20mm	O
,	O
which	O
is	O
less	O
than	O
half	O
that	O
of	O
typical	O
DSLRs	B-Device
.	O
</s>
<s>
The	O
effect	O
is	O
that	O
the	O
GH1	O
body	O
is	O
smaller	O
in	O
every	O
critical	O
dimension	O
,	O
especially	O
depth	O
,	O
and	O
is	O
also	O
lighter	O
weight	O
when	O
compared	O
to	O
a	O
typical	O
DSLR	B-Device
.	O
</s>
<s>
This	O
20mm	O
flange	O
to	O
image	O
sensor	O
distance	O
prohibits	O
the	O
practical	O
implementation	O
of	O
the	O
traditional	O
mirror	O
box	O
and	O
pentaprism	O
optical	O
viewfinder	O
of	O
the	O
typical	O
DSLR	B-Device
.	O
</s>
<s>
The	O
Panasonic	O
electronic	B-Algorithm
viewfinder	I-Algorithm
is	O
the	O
solution	O
to	O
that	O
packaging	O
issue	O
.	O
</s>
<s>
With	O
an	O
electronic	B-Algorithm
viewfinder	I-Algorithm
,	O
in	O
addition	O
to	O
providing	O
a	O
clear	O
brighter	O
than	O
DSLR	B-Device
view	O
,	O
the	O
user	O
can	O
also	O
select	O
between	O
a	O
variety	O
of	O
image	O
aspect	O
ratios	O
(	O
4:3	O
;	O
3:2	O
;	O
16:9	O
and	O
1:1	O
)	O
with	O
a	O
100%	O
image	O
area	O
through	O
the	O
lens	O
in	O
live	B-Device
view	I-Device
,	O
something	O
impossible	O
with	O
the	O
traditional	O
DSLR	B-Device
optical	O
viewfinder	O
.	O
</s>
<s>
The	O
user	O
may	O
select	O
various	O
overlays	O
so	O
that	O
more	O
than	O
20	O
pieces	O
of	O
additional	O
information	O
are	O
available	O
at	O
a	O
glance	O
to	O
the	O
user	O
without	O
removing	O
the	O
eye	O
from	O
the	O
electronic	B-Algorithm
viewfinder	I-Algorithm
.	O
</s>
<s>
For	O
example	O
,	O
flash	O
setting	O
,	O
optical	O
image	O
stabilization	O
mode	O
(	O
there	O
are	O
3	O
)	O
,	O
drive	O
mode	O
(	O
single	O
,	O
burst	O
,	O
bracket	O
,	O
timer	O
)	O
,	O
image	O
aspect	O
ratio	O
,	O
image	O
quality	O
(	O
RAW	B-Application
,	O
JPEG	O
or	O
both	O
)	O
,	O
exposure	O
indicator	O
,	O
ISO	O
speed	O
,	O
shutter	O
speed	O
,	O
aperture	B-General_Concept
,	O
record	O
mode	O
,	O
white	B-Algorithm
balance	I-Algorithm
,	O
composition	O
grid	O
lines	O
and	O
exposure	O
histogram	O
are	O
just	O
some	O
of	O
the	O
available	O
pieces	O
of	O
information	O
in	O
the	O
EVF	O
,	O
all	O
without	O
ever	O
having	O
to	O
move	O
the	O
eye	O
from	O
the	O
viewfinder	O
.	O
</s>
<s>
The	O
EVF	O
live	B-Device
view	I-Device
mode	O
also	O
allows	O
a	O
preview	O
of	O
the	O
actual	O
exposure	O
in	O
manual	O
mode	O
.	O
</s>
<s>
The	O
user	O
can	O
adjust	O
shutter	O
speed	O
and	O
aperture	B-General_Concept
in	O
manual	O
mode	O
and	O
see	O
the	O
actual	O
effect	O
on	O
the	O
recorded	O
exposure	O
in	O
the	O
EVF	O
.	O
</s>
<s>
In	O
burst	O
mode	O
,	O
when	O
the	O
main	O
image	O
sensor	O
must	O
pull	O
double	O
duty	O
recording	O
the	O
image	O
and	O
also	O
feeding	O
a	O
live	B-Device
view	I-Device
to	O
the	O
EVF	O
,	O
image	O
lag	O
may	O
become	O
apparent	O
,	O
and	O
it	O
can	O
be	O
difficult	O
to	O
follow	O
a	O
fast	O
moving	O
object	O
in	O
the	O
viewfinder	O
.	O
</s>
<s>
With	O
the	O
EVF	O
being	O
an	O
electronic	O
display	O
,	O
the	O
GH1	O
uses	O
considerably	O
more	O
battery	O
power	O
than	O
the	O
traditional	O
DSLR	B-Device
,	O
requiring	O
more	O
frequent	O
battery	O
changes	O
.	O
</s>
<s>
Virtually	O
all	O
the	O
functionality	O
of	O
the	O
EVF	O
is	O
available	O
on	O
the	O
articulated	O
LCD	B-Device
display	I-Device
panel	O
on	O
the	O
back	O
of	O
the	O
camera	O
.	O
</s>
<s>
The	O
EVF	O
also	O
has	O
an	O
eye	O
sensor	O
,	O
so	O
that	O
the	O
EVF	O
will	O
turn	O
on	O
almost	O
instantaneously	O
,	O
switching	O
off	O
the	O
LCD	B-Device
panel	I-Device
when	O
the	O
eye	O
is	O
brought	O
up	O
the	O
EVF	O
.	O
</s>
<s>
Complementing	O
the	O
GH1	O
is	O
a	O
purpose	O
built	O
video	O
optimized	O
"	O
kit	O
"	O
super	O
zoom	O
lens	O
,	O
the	O
HD	O
video-optimized	O
LUMIX	B-Device
G	O
VARIO	O
HD	O
14-140mm/F4.0	O
-5.8	O
ASPH./MEGA	O
O.I.S.	O
</s>
<s>
This	O
optical	O
image	O
stabilized	O
(	O
Panasonic	O
brand	O
name	O
"	O
MEGA	O
O.I.S	O
"	O
)	O
is	O
video	O
unique	O
because	O
it	O
is	O
near	O
silent	O
in	O
operation	O
,	O
designed	O
with	O
an	O
internal	O
direct-drive	O
linear	O
motor	O
for	O
fast	O
and	O
continuous	O
accurate	O
contrast	O
detect	O
auto	O
focusing	O
,	O
and	O
a	O
silent	O
,	O
step-less	O
(	O
as	O
opposed	O
to	O
the	O
traditional	O
stepped	O
)	O
circular	O
(	O
as	O
opposed	O
to	O
the	O
more	O
traditional	O
hexagonal	O
)	O
aperture	B-General_Concept
diaphragm	O
,	O
ideal	O
for	O
smooth	O
light	O
control	O
so	O
important	O
for	O
video	O
.	O
</s>
<s>
The	O
micro	B-Operating_System
four	I-Operating_System
thirds	I-Operating_System
sensor	O
provides	O
some	O
advantages	O
in	O
allowing	O
a	O
smaller	O
,	O
lighter	O
,	O
more	O
compact	O
zoom	O
lens	O
design	O
.	O
</s>
<s>
The	O
GH1	O
's	O
successor	O
,	O
the	O
Panasonic	B-Device
Lumix	I-Device
DMC-GH2	I-Device
was	O
announced	O
in	O
September	O
2010	O
.	O
</s>
<s>
Improved	O
the	O
performance	O
of	O
AWB	O
(	O
Auto	B-Algorithm
White	I-Algorithm
Balance	I-Algorithm
)	O
.	O
</s>
<s>
</s>
<s>
Availability	O
of	O
AF	O
performance	O
in	O
FHD	O
(	O
full	O
HD	O
)	O
movie	O
recording	O
mode	O
with	O
Four	B-Architecture
Thirds	I-Architecture
lenses	O
that	O
are	O
compatible	O
with	O
contrast	O
AF	O
.	O
</s>
