<s>
The	O
Olympus	B-Algorithm
OM-2	I-Algorithm
is	O
a	O
single-lens	B-Algorithm
reflex	I-Algorithm
film	O
system	O
camera	O
produced	O
by	O
Olympus	O
of	O
Japan	O
.	O
</s>
<s>
The	O
Olympus	B-Algorithm
OM-2	I-Algorithm
is	O
an	O
aperture-priority	B-Algorithm
automatic-exposure	O
camera	O
(	O
with	O
full	O
manual	O
operation	O
selected	O
via	O
switch	O
)	O
,	O
based	O
on	O
the	O
earlier	O
,	O
successful	O
Olympus	B-Algorithm
OM-1	I-Algorithm
body	O
.	O
</s>
<s>
The	O
OM-2	B-Algorithm
was	O
introduced	O
in	O
1975	O
,	O
and	O
combined	O
the	O
light	O
,	O
sturdy	O
camera	O
body	O
style	O
of	O
the	O
manual-only	O
OM-1	B-Algorithm
with	O
a	O
new	O
automatic	O
exposure	O
system	O
.	O
</s>
<s>
One	O
of	O
the	O
main	O
selling	O
points	O
of	O
the	O
OM-2	B-Algorithm
was	O
that	O
all	O
of	O
the	O
OM-1	B-Algorithm
accessories	O
and	O
lenses	O
would	O
fit	O
without	O
modification	O
,	O
offering	O
a	O
compact	O
system	O
and	O
an	O
easy	O
upgrade	O
path	O
for	O
OM-1	B-Algorithm
owners	O
.	O
</s>
<s>
Although	O
the	O
camera	O
was	O
promoted	O
in	O
photography	O
publications	O
and	O
magazines	O
as	O
technically	O
superior	O
,	O
Olympus	O
as	O
a	O
company	O
did	O
not	O
have	O
the	O
same	O
recognition	O
as	O
Nikon	B-Algorithm
or	O
Canon	O
and	O
,	O
as	O
a	O
result	O
,	O
some	O
professionals	O
considered	O
the	O
cameras	O
inferior	O
due	O
to	O
their	O
lighter	O
weight	O
.	O
</s>
<s>
Despite	O
this	O
a	O
number	O
used	O
the	O
OM-2	B-Algorithm
including	O
Patrick	O
Lichfield	O
,	O
Kon	O
Sasaki	O
,	O
Roy	O
Morsch	O
,	O
Jacques	O
Schumacher	O
,	O
Robert	O
Semeniuk	O
,	O
and	O
James	O
Sugar	O
.	O
</s>
<s>
Of	O
the	O
many	O
features	O
the	O
OM-2	B-Algorithm
boasted	O
,	O
the	O
most	O
commonly	O
advertised	O
feature	O
was	O
that	O
it	O
was	O
the	O
first	O
camera	O
to	O
offer	O
a	O
TTL	O
direct	O
metering	O
system	O
for	O
film	O
,	O
named	O
Auto	O
Dynamic	O
Metering	O
(	O
ADM	O
)	O
.	O
</s>
<s>
Another	O
feature	O
of	O
the	O
OM-2	B-Algorithm
was	O
the	O
integration	O
of	O
two	O
available	O
electronic	O
flash	O
guns	O
into	O
the	O
system	O
.	O
</s>
<s>
The	O
model	O
series	O
appeared	O
in	O
the	O
following	O
order	O
:	O
OM-2	B-Algorithm
,	O
OM-2	B-Algorithm
MD	O
,	O
OM-2N	O
MD	O
and	O
thereafter	O
the	O
heavily	O
revised	O
OM-2S/OM	O
-2	O
Spot	O
Program	O
,	O
which	O
was	O
,	O
essentially	O
,	O
a	O
new	O
mechanism	O
within	O
a	O
similar	O
body	O
.	O
</s>
<s>
The	O
OM-2	B-Algorithm
,	O
OM-2	B-Algorithm
MD	O
and	O
OM-2N	O
MD	O
camera	O
came	O
in	O
chrome	O
or	O
black	O
finish	O
.	O
</s>
<s>
The	O
OM-2S	B-Algorithm
(	O
In	O
USA	O
)	O
and	O
OM-2	B-Algorithm
Spot/Program	O
(	O
elsewhere	O
)	O
came	O
only	O
in	O
black	O
.	O
</s>
<s>
The	O
principal	O
difference	O
between	O
the	O
OM-2	B-Algorithm
and	O
OM-2	B-Algorithm
MD	O
models	O
was	O
the	O
provision	O
of	O
a	O
removable	O
cap	O
on	O
the	O
base-plate	O
to	O
permit	O
attachment	O
of	O
the	O
OM	B-Algorithm
system	I-Algorithm
Motor	O
Drive	O
1	O
(	O
or	O
the	O
later	O
Motor	O
Drive	O
2	O
)	O
for	O
film	O
advance	O
at	O
5	O
frames	O
per	O
second	O
and	O
the	O
placement	O
of	O
an	O
"	O
MD	O
"	O
badge	O
on	O
the	O
front	O
left	O
face	O
of	O
the	O
camera	O
.	O
</s>
<s>
The	O
non-MD	O
badged	O
OM-2	B-Algorithm
cameras	O
needed	O
to	O
go	O
to	O
a	O
service	O
facility	O
to	O
enable	O
attachment	O
of	O
a	O
motor	O
drive	O
.	O
</s>
<s>
There	O
is	O
some	O
confusion	O
about	O
the	O
MD	O
badge	O
that	O
appears	O
at	O
the	O
4	O
o'clock	O
position	O
on	O
some	O
OM-2	B-Algorithm
'	O
s	O
,	O
but	O
not	O
on	O
others	O
.	O
</s>
<s>
The	O
general	O
understanding	O
is	O
that	O
all	O
OM-2	B-Algorithm
'	O
s	O
are	O
motor	O
drive	O
and	O
winder	O
1	O
or	O
2	O
capable	O
(	O
and	O
included	O
the	O
coupler	O
opening	O
and	O
removable	O
cap	O
)	O
,	O
at	O
least	O
the	O
U.S.	O
"	O
legally	O
imported	O
"	O
ones	O
from	O
Ponder	O
and	O
Best	O
.	O
</s>
<s>
The	O
re-worked	O
base	O
plates	O
(	O
and	O
other	O
modifications	O
)	O
were	O
only	O
required	O
for	O
early	O
OM-1	B-Algorithm
models	O
.	O
</s>
<s>
OM-2	B-Algorithm
and	O
OM-2	B-Algorithm
MD	O
cameras	O
had	O
the	O
hot	B-Algorithm
shoe	I-Algorithm
2	O
or	O
3	O
for	O
attaching	O
a	O
flash	O
unit	O
.	O
</s>
<s>
Additionally	O
,	O
the	O
OM-2	B-Algorithm
and	O
OM-2	B-Algorithm
MD	O
models	O
had	O
a	O
reset	O
position	O
on	O
the	O
shutter	O
speed	O
dial	O
adjacent	O
to	O
the	O
B	O
setting	O
.	O
</s>
<s>
The	O
"	O
N	O
"	O
model	O
had	O
a	O
new	O
,	O
re-contoured	O
advance	O
lever	O
which	O
had	O
smoother	O
,	O
rounded	O
edges	O
as	O
opposed	O
to	O
the	O
OM-2	B-Algorithm
and	O
OM-2MD	O
'	O
s	O
advance	O
lever	O
's	O
slimmer	O
and	O
sharper	O
edges	O
.	O
</s>
<s>
The	O
OM-2N	O
MD	O
used	O
hot	B-Algorithm
shoe	I-Algorithm
4	O
with	O
two	O
additional	O
contacts	O
above	O
the	O
main	O
central	O
sync	O
point	O
.	O
</s>
<s>
For	O
this	O
purpose	O
an	O
OM-2N	O
MD	O
will	O
have	O
the	O
large	O
securing	O
threaded	O
recess	O
used	O
for	O
shoe	O
1	O
on	O
the	O
older	O
OM-2	B-Algorithm
MD	O
plus	O
two	O
smaller	O
recesses	O
for	O
the	O
added	O
contacts	O
visible	O
on	O
the	O
rear	O
of	O
the	O
prism	O
above	O
the	O
viewfinder	O
.	O
</s>
<s>
The	O
flash	B-Algorithm
shoes	I-Algorithm
are	O
not	O
backwardly	O
interchangeable	O
between	O
models	O
.	O
</s>
<s>
The	O
OM-2N	O
MD	O
added	O
,	O
via	O
the	O
shoe	O
4	O
circuitry	O
,	O
the	O
following	O
features	O
to	O
the	O
OM-2	B-Algorithm
MD	O
:	O
A	O
flash	O
charge-ready	O
light	O
in	O
the	O
viewfinder	O
and	O
correct	O
flash	O
exposure	O
confirmation	O
by	O
flashing	O
this	O
same	O
green	O
LED	O
after	O
exposure	O
.	O
</s>
<s>
The	O
OM-2SP	O
Spot	O
Program	O
(	O
OM-2S	B-Algorithm
in	O
the	O
USA	O
)	O
was	O
a	O
thorough	O
overhaul	O
of	O
the	O
OM-2	B-Algorithm
innards	O
to	O
make	O
the	O
model	O
more	O
competitive	O
.	O
</s>
<s>
It	O
has	O
more	O
commonality	O
with	O
the	O
OM-4	B-Algorithm
than	O
the	O
previous	O
OM-2	B-Algorithm
,	O
a	O
fact	O
which	O
simplified	O
production	O
for	O
Olympus	O
which	O
had	O
,	O
by	O
the	O
time	O
of	O
the	O
OM-2S	B-Algorithm
launch	O
,	O
released	O
the	O
OM-4	B-Algorithm
and	O
the	O
OM-3	B-Algorithm
models	O
.	O
</s>
<s>
The	O
OM-2S	B-Algorithm
used	O
the	O
OM-4	B-Algorithm
shutter	O
mechanism	O
but	O
without	O
the	O
1/2000	O
sec	O
top	O
speed	O
,	O
using	O
instead	O
1/1000	O
as	O
the	O
maximum	O
.	O
</s>
<s>
This	O
addressed	O
a	O
failing	O
of	O
the	O
older	O
all-electronic	O
OM-2	B-Algorithm
models	O
which	O
were	O
unusable	O
without	O
batteries	O
.	O
</s>
<s>
Additionally	O
,	O
a	O
basic	O
level	O
of	O
weather-sealing	O
was	O
provided	O
as	O
a	O
new	O
feature	O
in	O
the	O
OM-2	B-Algorithm
line	O
.	O
</s>
<s>
While	O
the	O
older	O
OM-2	B-Algorithm
models	O
could	O
routinely	O
withstand	O
harsh	O
conditions	O
,	O
they	O
were	O
never	O
advertised	O
as	O
having	O
any	O
environmental	O
protection	O
features	O
.	O
</s>
<s>
The	O
OM-2S	B-Algorithm
offered	O
only	O
3.5	O
frames	O
per	O
second	O
when	O
coupled	O
to	O
the	O
motor	O
drive	O
1	O
or	O
2	O
.	O
</s>
<s>
All	O
the	O
previous	O
focusing	O
screens	O
and	O
accessories	O
(	O
with	O
the	O
exception	O
of	O
the	O
flash	B-Algorithm
shoe	I-Algorithm
attachments	O
)	O
available	O
in	O
the	O
OM	B-Algorithm
system	I-Algorithm
were	O
compatible	O
with	O
the	O
camera	O
.	O
</s>
<s>
The	O
camera	O
body	O
had	O
a	O
fixed	O
hot-shoe	B-Algorithm
and	O
a	O
plug	O
on	O
the	O
front-left	O
for	O
coupling	O
of	O
the	O
Olympus	O
flash	O
group	O
's	O
TTL	O
connector	O
cable	O
(	O
previously	O
the	O
OM-2N	O
MD	O
series	O
required	O
removal	O
of	O
the	O
flash	B-Algorithm
shoe	I-Algorithm
and	O
the	O
attachment	O
of	O
a	O
TTL	O
connector	O
to	O
facilitate	O
this	O
)	O
.	O
</s>
<s>
The	O
OM-2S	B-Algorithm
had	O
three	O
operational	O
modes	O
.	O
</s>
<s>
The	O
OM-2S	B-Algorithm
still	O
made	O
use	O
of	O
the	O
direct	O
off	O
the	O
film	O
metering	O
although	O
the	O
OM-2S	B-Algorithm
used	O
a	O
single	O
metering	O
cell	O
in	O
the	O
base	O
of	O
the	O
mirror	O
box	O
for	O
all	O
metering	O
.	O
</s>
<s>
The	O
OM-2S	B-Algorithm
used	O
the	O
same	O
metering	O
cell	O
for	O
all	O
operations	O
and	O
light	O
for	O
the	O
preview	O
reading	O
was	O
sent	O
to	O
the	O
cell	O
via	O
a	O
secondary	O
mirror	O
mounted	O
behind	O
the	O
semi-opaque	O
main	O
mirror	O
as	O
in	O
the	O
OM-3	B-Algorithm
and	O
OM-4	B-Algorithm
models	O
.	O
</s>
<s>
The	O
self-timer	O
on	O
the	O
OM-2S	B-Algorithm
was	O
electronic	O
.	O
</s>
