<s>
The	O
Olympus	B-Algorithm
Pen	I-Algorithm
E-P1	I-Algorithm
announced	O
on	O
16	O
June	O
2009	O
is	O
Olympus	O
Corporation	O
's	O
first	O
camera	O
that	O
adheres	O
to	O
the	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
(	O
MFT	O
)	O
system	O
design	O
standard	O
.	O
</s>
<s>
The	O
first	O
camera	O
to	O
use	O
the	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
mount	O
was	O
Panasonic	B-Device
's	I-Device
G-1	I-Device
camera	O
.	O
</s>
<s>
The	O
design	O
of	O
the	O
camera	O
is	O
reminiscent	O
of	O
the	O
Olympus	B-Algorithm
Pen	I-Algorithm
half	O
frame	O
film	O
cameras	O
and	O
is	O
marketed	O
as	O
the	O
Olympus	O
digital	O
PEN	O
.	O
</s>
<s>
The	O
model	O
presented	O
on	O
16	O
June	O
2009	O
was	O
very	O
similar	O
in	O
looks	O
to	O
the	O
Olympus	B-Algorithm
Pen	I-Algorithm
F	I-Algorithm
.	O
Initially	O
,	O
two	O
micro	B-Operating_System
4/3	I-Operating_System
lenses	O
were	O
available	O
from	O
Olympus	O
,	O
one	O
14	O
–	O
42mm	O
f/3.5	O
–	O
5.6	O
zoom	O
and	O
a	O
17mm	O
f/2.8	O
pancake	O
prime	O
lens	O
.	O
</s>
<s>
Remarkably	O
,	O
with	O
the	O
exception	O
of	O
the	O
optical	O
viewfinder	O
,	O
the	O
E-P1	O
seemed	O
to	O
fit	O
most	O
of	O
the	O
features	O
found	O
on	O
the	O
Olympus	B-Algorithm
E-620	I-Algorithm
,	O
a	O
larger	O
Four	B-Architecture
Thirds	I-Architecture
system	I-Architecture
DSLR	B-Device
,	O
into	O
the	O
small	O
,	O
compact	O
MFT	O
form	O
factor	O
.	O
</s>
<s>
In	O
addition	O
to	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
lenses	O
,	O
Olympus	O
offers	O
adapters	O
allowing	O
the	O
use	O
of	O
Four	B-Architecture
Thirds	I-Architecture
lenses	O
,	O
or	O
OM	O
Zuiko	O
lenses	O
originally	O
manufactured	O
for	O
use	O
on	O
the	O
classic	O
OM	O
series	O
of	O
film	O
SLR	B-Algorithm
cameras	I-Algorithm
that	O
Olympus	O
was	O
famed	O
for	O
years	O
ago	O
.	O
</s>
<s>
The	O
E-P1	O
does	O
not	O
have	O
a	O
built-in	O
optical	O
or	O
electronic	B-Algorithm
viewfinder	I-Algorithm
,	O
but	O
instead	O
uses	O
the	O
large	O
inch	O
color	O
"	O
HyperCrystal	O
"	O
LCD	B-Device
on	O
the	O
back	O
of	O
the	O
camera	O
.	O
</s>
<s>
The	O
fixed	O
LCD	B-Device
panel	I-Device
with	O
anti-reflective	O
coating	O
presents	O
a	O
100%	O
live	B-Device
preview	I-Device
of	O
the	O
image	O
as	O
seen	O
by	O
the	O
sensor	O
.	O
</s>
<s>
In	O
an	O
interview	O
,	O
Mr	O
Akira	O
Watanabe	O
,	O
SLR	B-Algorithm
Planning	O
Department	O
Manager	O
for	O
Olympus	O
Imaging	O
,	O
said	O
that	O
for	O
a	O
number	O
of	O
reasons	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
was	O
developed	O
to	O
meet	O
the	O
demands	O
of	O
those	O
who	O
wanted	O
a	O
DSLR	B-Device
,	O
but	O
without	O
the	O
size	O
problems	O
that	O
come	O
with	O
one	O
.	O
</s>
<s>
The	O
17mm	O
f/2.8	O
pancake	O
lens	O
or	O
the	O
14	O
–	O
42mm	O
f/3.5	O
–	O
5.6	O
zoom	O
lens	O
are	O
of	O
the	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
lens	O
mount	O
which	O
means	O
they	O
are	O
smaller	O
than	O
Four	B-Architecture
Thirds	I-Architecture
lenses	O
which	O
require	O
an	O
adapter	O
to	O
fit	O
the	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
body	O
.	O
</s>
<s>
Several	O
third-party	O
manufacturers	O
offer	O
adapters	O
for	O
lenses	O
of	O
virtually	O
all	O
single-lens	B-Algorithm
reflex	I-Algorithm
and	O
rangefinder	B-Algorithm
systems	O
,	O
plus	O
some	O
cinema	O
lenses	O
.	O
</s>
<s>
At	O
the	O
time	O
of	O
the	O
announcement	O
of	O
the	O
Olympus	B-Algorithm
E-P1	I-Algorithm
,	O
there	O
was	O
one	O
other	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
camera	O
on	O
the	O
market	O
,	O
the	O
Panasonic	B-Device
Lumix	I-Device
DMC-G1	I-Device
.	O
</s>
<s>
The	O
two	O
cameras	O
materialize	O
two	O
very	O
different	O
concept	O
,	O
but	O
both	O
are	O
built	O
around	O
a	O
Four	B-Architecture
Thirds	I-Architecture
sized	O
sensor	O
and	O
the	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
lens	O
mount	O
.	O
</s>
<s>
The	O
Panasonic	B-Device
G1	I-Device
's	O
body	O
is	O
SLR-style	O
,	O
with	O
the	O
bump	O
on	O
the	O
top	O
of	O
the	O
camera	O
,	O
where	O
the	O
pentaprism	O
is	O
placed	O
in	O
SLR	B-Algorithm
's	O
,	O
in	O
the	O
G1	O
,	O
it	O
houses	O
the	O
electronic	B-Algorithm
viewfinder	I-Algorithm
.	O
</s>
<s>
the	O
E-P1	O
does	O
not	O
have	O
one	O
,	O
so	O
it	O
is	O
almost	O
flat	O
,	O
which	O
makes	O
it	O
a	O
rangefinder-style	O
mirrorless	O
camera	O
.	O
</s>
<s>
It	O
is	O
not	O
only	O
the	O
styling	O
though	O
,	O
the	O
G1	O
's	O
ergonomics	O
and	O
handling	O
are	O
more	O
like	O
a	O
DSLR	B-Device
camera	I-Device
.	O
</s>
<s>
However	O
,	O
the	O
G1	O
has	O
an	O
adjustable	O
angle	O
display	O
,	O
an	O
electronic	B-Algorithm
viewfinder	I-Algorithm
and	O
a	O
built-in	O
flash	O
.	O
</s>
<s>
The	O
E-P1	O
was	O
replaced	O
by	O
the	O
Olympus	B-Algorithm
PEN	I-Algorithm
E-P2	I-Algorithm
which	O
was	O
announced	O
in	O
November	O
2009	O
and	O
complemented	O
by	O
the	O
low-end	O
Olympus	B-Algorithm
PEN	I-Algorithm
E-PL1	I-Algorithm
.	O
</s>
