<s>
The	O
Nikon	B-Algorithm
F-401	O
(	O
N4004	O
in	O
North	O
America	O
)	O
was	O
a	O
beginner	O
's	O
level	O
,	O
autofocus	O
,	O
35mm	O
,	O
single-lens	B-Algorithm
reflex	I-Algorithm
(	O
SLR	B-Algorithm
)	O
film	B-Application
camera	I-Application
built	O
by	O
Nikon	B-Algorithm
and	O
introduced	O
in	O
1987	O
.	O
</s>
<s>
The	O
camera	O
represented	O
one	O
of	O
Nikon	B-Algorithm
's	O
first	O
endeavours	O
into	O
consumer-based	O
autofocus	O
,	O
as	O
a	O
follow-up	O
to	O
their	O
first	O
autofocus	O
SLR	B-Algorithm
in	O
1986	O
,	O
the	O
Nikon	B-Algorithm
F-501	I-Algorithm
(	O
known	O
as	O
the	O
N2020	B-Algorithm
in	O
North	O
America	O
)	O
.	O
</s>
<s>
The	O
camera	O
lacked	O
many	O
of	O
the	O
advanced	O
features	O
that	O
more	O
seasoned	O
amateurs	O
and	O
professionals	O
required	O
,	O
but	O
it	O
was	O
a	O
harbinger	O
of	O
the	O
future	O
as	O
it	O
included	O
a	O
pronounced	O
,	O
built-in	O
grip	O
as	O
well	O
as	O
an	O
integrated	O
TTL	O
Flash	O
that	O
is	O
now	O
commonplace	O
on	O
all	O
but	O
the	O
most	O
high-end	O
SLR	B-Algorithm
cameras	I-Algorithm
.	O
</s>
<s>
Furthermore	O
,	O
the	O
camera	O
's	O
lack	O
of	O
support	O
for	O
AI	O
lenses	O
meant	O
that	O
while	O
all	O
previous	O
Nikon	B-Algorithm
lenses	O
could	O
be	O
mounted	O
to	O
the	O
camera	O
,	O
none	O
supported	O
automatic	O
exposure	O
TTL	O
metering	O
.	O
</s>
<s>
By	O
the	O
1990s	O
,	O
the	O
F-401	O
was	O
part	O
of	O
a	O
lineup	O
of	O
autofocus	O
consumer	O
SLRs	B-Algorithm
that	O
included	O
the	O
more	O
expensive	O
Nikon	B-Algorithm
F-601	I-Algorithm
and	O
Nikon	B-Algorithm
F-801	I-Algorithm
.	O
</s>
