<s>
The	O
Nikon	B-Algorithm
EM	I-Algorithm
is	O
a	O
beginner	O
's	O
level	O
,	O
interchangeable	O
lens	O
,	O
35	O
mm	O
film	O
,	O
single	B-Algorithm
lens	I-Algorithm
reflex	I-Algorithm
(	O
SLR	B-Algorithm
)	O
camera	O
.	O
</s>
<s>
The	O
camera	O
was	O
designed	O
for	O
and	O
marketed	O
to	O
the	O
growing	O
market	O
of	O
new	O
photographers	O
then	O
entering	O
the	O
SLR	B-Algorithm
buyer	O
's	O
market	O
.	O
</s>
<s>
The	O
EM	O
accepts	O
nearly	O
all	O
lenses	O
with	O
the	O
Nikon	B-Architecture
F	I-Architecture
bayonet	I-Architecture
mount	I-Architecture
except	O
lenses	O
introduced	O
in	O
1959	O
,	O
non-ai	O
lenses	O
will	O
damage	O
the	O
lensmount	O
,	O
it	O
does	O
support	O
the	O
automatic	O
indexing	O
(	O
AI	O
)	O
feature	O
introduced	O
in	O
1977	O
.	O
</s>
<s>
Nikon	O
's	O
most	O
recent	O
35mm	O
film	O
SLR	B-Algorithm
lenses	O
,	O
the	O
AF	O
Nikkor	O
G	O
type	O
introduced	O
in	O
2000	O
,	O
lack	O
an	O
aperture	O
control	O
ring	O
,	O
and	O
the	O
AF	O
Nikkor	O
DX	O
type	O
(	O
2003	O
)	O
with	O
image	O
circles	O
sized	O
for	O
Nikon	O
's	O
digital	O
SLRs	B-Algorithm
will	O
mount	O
but	O
will	O
not	O
function	O
properly	O
.	O
</s>
<s>
IX	O
Nikkor	O
lenses	O
introduced	O
in	O
1996	O
for	O
Nikon	O
's	O
Advanced	O
Photo	O
System	O
SLRs	B-Algorithm
must	O
not	O
be	O
mounted	O
to	O
an	O
EM	O
,	O
as	O
their	O
rear	O
elements	O
will	O
intrude	O
far	O
enough	O
into	O
the	O
mirror	O
box	O
to	O
cause	O
damage	O
.	O
</s>
<s>
Beginning	O
in	O
1977	O
with	O
the	O
advanced	O
amateur	O
Nikon	B-Algorithm
FM	I-Algorithm
,	O
there	O
was	O
a	O
complete	O
overhaul	O
of	O
the	O
entire	O
Nikon	O
SLR	B-Algorithm
line	O
.	O
</s>
<s>
The	O
1970s	O
and	O
1980s	O
were	O
an	O
era	O
of	O
intense	O
competition	O
among	O
major	O
SLR	B-Algorithm
brands	O
Nikon	O
,	O
Canon	O
,	O
Minolta	O
,	O
Pentax	B-Application
and	O
Olympus	O
.	O
</s>
<s>
The	O
industry	O
was	O
trying	O
to	O
expand	O
out	O
from	O
the	O
saturated	O
high-end	O
professional	O
market	O
and	O
appeal	O
to	O
the	O
large	O
mass	O
of	O
amateur	O
photographers	O
who	O
wanted	O
to	O
move	O
up	O
from	O
compact	O
automatic	O
leaf-shutter	O
rangefinder	B-Algorithm
cameras	I-Algorithm
to	O
an	O
SLR	B-Algorithm
,	O
but	O
were	O
intimidated	O
by	O
the	O
need	O
to	O
learn	O
the	O
details	O
of	O
operating	O
a	O
traditional	O
SLR	B-Algorithm
.	O
</s>
<s>
Although	O
Nikon	O
cameras	O
like	O
the	O
F2	B-Algorithm
of	O
1971	O
were	O
highly	O
regarded	O
by	O
professional	O
photographers	O
,	O
the	O
F2	B-Algorithm
's	O
bulk	O
,	O
expense	O
,	O
and	O
intricacy	O
made	O
it	O
a	O
slow	O
seller	O
to	O
most	O
amateurs	O
and	O
beginners	O
.	O
</s>
<s>
Although	O
Nikon	O
's	O
mid-level	O
Nikkormat	O
FT	O
(	O
1965	O
)	O
and	O
EL	O
(	O
1972	O
)	O
camera	O
series	O
were	O
made	O
almost	O
as	O
well	O
as	O
the	O
Nikon	B-Algorithm
F	I-Algorithm
and	O
F2	B-Algorithm
,	O
their	O
relatively	O
high	O
price	O
turned	O
amateurs	O
toward	O
less	O
expensive	O
models	O
from	O
other	O
manufacturers	O
.	O
</s>
<s>
The	O
Nikon	B-Algorithm
EM	I-Algorithm
formed	O
the	O
base	O
of	O
the	O
new	O
line	O
.	O
</s>
<s>
On	O
introduction	O
it	O
was	O
the	O
smallest	O
and	O
cheapest	O
Nikon	O
SLR	B-Algorithm
ever	O
made	O
.	O
</s>
<s>
It	O
was	O
an	O
electromechanically-controlled	O
,	O
manual-focus	O
camera	O
powered	O
by	O
button	B-Algorithm
batteries	I-Algorithm
.	O
</s>
<s>
The	O
viewfinder	O
also	O
had	O
Nikon	O
's	O
standard	O
3mm	O
split	O
image	O
rangefinder	B-Algorithm
and	O
1mm	O
microprism	O
collar	O
focusing	O
aids	O
,	O
but	O
the	O
focus	O
screen	O
was	O
fixed	O
.	O
</s>
<s>
The	O
EM	O
and	O
its	O
E-system	O
accessories	O
were	O
Nippon	O
Kogaku	O
's	O
first	O
attempt	O
to	O
reach	O
the	O
low	O
end	O
of	O
the	O
SLR	B-Algorithm
market	O
.	O
</s>
<s>
Called	O
internally	O
“	O
SLR	B-Algorithm
Camera	I-Algorithm
for	O
Women	O
”	O
,	O
the	O
EM	O
was	O
designed	O
to	O
provide	O
style	O
,	O
with	O
its	O
exterior	O
contours	O
designed	O
Italian	O
automobile	O
stylist	O
Giorgetto	O
Giugiaro	O
)	O
;	O
convenience	O
with	O
a	O
system	O
of	O
dedicated	O
accessories	O
;	O
as	O
much	O
ease	O
of	O
use	O
and	O
automation	O
as	O
was	O
possible	O
in	O
1979	O
;	O
low	O
cost	O
by	O
dint	O
of	O
a	O
simplified	O
manufacturing	O
process	O
,	O
and	O
the	O
prestige	O
of	O
the	O
Nikon	O
name	O
prominently	O
displayed	O
on	O
the	O
pentaprism	O
housing	O
.	O
</s>
<s>
The	O
Nikon	B-Algorithm
EM	I-Algorithm
and	O
its	O
later	O
offshoots	O
the	O
FG	B-Algorithm
and	O
FG-20	B-Algorithm
were	O
a	O
sales	O
and	O
marketing	O
failure	O
for	O
Nikon	O
.	O
</s>
