<s>
The	O
Nikon	B-Algorithm
F4	O
is	O
a	O
35mm	O
autofocus	O
(	O
AF	O
)	O
single	B-Algorithm
lens	I-Algorithm
reflex	I-Algorithm
(	O
SLR	B-Algorithm
)	O
film	O
camera	O
,	O
introduced	O
in	O
1988	O
as	O
the	O
next	O
generation	O
in	O
Nikon	B-Algorithm
's	O
line	O
of	O
F	B-Algorithm
series	I-Algorithm
professional	O
cameras	O
.	O
</s>
<s>
With	O
industrial	O
design	O
by	O
Giorgetto	O
Giugiaro	O
,	O
the	O
F4	O
was	O
the	O
first	O
professional	O
Nikon	B-Algorithm
to	O
feature	O
a	O
practical	O
autofocus	O
system	O
.	O
</s>
<s>
The	O
F4	O
is	O
able	O
to	O
accept	O
any	O
of	O
Nikon	B-Algorithm
's	O
manual	O
focus	O
(	O
MF	O
)	O
or	O
AF	O
lenses	O
from	O
1959	O
to	O
the	O
present	O
day	O
,	O
including	O
the	O
two	O
F3AF	O
lenses	O
(	O
in	O
Autofocus	O
mode	O
)	O
.	O
</s>
<s>
The	O
F4	O
succeeded	O
the	O
F3	B-Algorithm
,	O
a	O
manual	O
focus	O
camera	O
introduced	O
in	O
1980	O
but	O
outlasted	O
the	O
F4	O
as	O
it	O
stayed	O
in	O
production	O
until	O
2001	O
.	O
</s>
<s>
Nikon	B-Algorithm
introduced	O
its	O
next	O
flagship	O
model	O
,	O
the	O
F5	B-Algorithm
,	O
in	O
1996	O
.	O
</s>
<s>
The	O
F4	O
introduced	O
many	O
Nikon	B-Algorithm
owners	O
to	O
autofocus	O
(	O
as	O
well	O
as	O
focus	O
tracking	O
)	O
,	O
and	O
was	O
the	O
first	O
professional	O
Nikon	B-Algorithm
to	O
utilize	O
a	O
vertical-travel	O
metal-blade	O
shutter	O
(	O
with	O
shutter	O
balancer	O
to	O
minimize	O
noise	O
and	O
camera	O
bounce	O
)	O
.	O
</s>
<s>
For	O
the	O
first	O
time	O
on	O
a	O
Nikon	B-Algorithm
SLR	B-Algorithm
,	O
two	O
of	O
those	O
battery	O
packs	O
also	O
offered	O
an	O
additional	O
vertical	O
shutter	O
release	O
button	O
and	O
grip	O
for	O
using	O
the	O
camera	O
vertically	O
.	O
</s>
<s>
Its	O
controls	O
were	O
transitional	O
between	O
those	O
of	O
mechanical	O
SLRs	B-Algorithm
and	O
future	O
professional	O
film	O
and	O
digital	O
SLRs	B-Algorithm
:	O
the	O
F4	O
's	O
electronics	O
,	O
LCD	O
viewfinder	O
display	O
,	O
autofocus	O
,	O
programmed	O
auto-exposure	O
,	O
and	O
matrix	O
meter	O
looked	O
to	O
the	O
future	O
,	O
but	O
it	O
also	O
retained	O
classic	O
dedicated	O
analog	O
dials	O
for	O
shutter	O
speed	O
,	O
lens	O
aperture	O
,	O
metering	O
pattern	O
,	O
and	O
exposure	O
compensation	O
.	O
</s>
<s>
While	O
it	O
was	O
a	O
complex	O
camera	O
with	O
over	O
1700	O
parts	O
,	O
the	O
F4	O
's	O
high-quality	O
mechanical	O
and	O
electronic	O
components	O
,	O
as	O
well	O
as	O
weather	O
sealing	O
and	O
tough	O
construction	O
,	O
made	O
for	O
a	O
reliable	O
and	O
long-lived	O
professional	O
SLR	B-Algorithm
.	O
</s>
<s>
The	O
F4	O
will	O
accept	O
all	O
autofocus	O
lenses	O
made	O
for	O
the	O
F	B-Architecture
mount	I-Architecture
,	O
as	O
well	O
all	O
manual	O
focus	O
F	B-Architecture
mount	I-Architecture
lenses	O
including	O
very	O
early	O
invasive	O
fisheye	O
lenses	O
.	O
</s>
<s>
The	O
F4	O
is	O
one	O
of	O
the	O
three	O
film	O
based	O
Nikon	B-Algorithm
cameras	O
offering	O
full	O
Matrix	O
metering	O
with	O
AI	O
manual	O
focus	O
lenses	O
.	O
</s>
<s>
The	O
F4	O
also	O
provides	O
no	O
support	O
for	O
Nikon	B-Algorithm
's	O
later	O
VR	O
(	O
Vibration	O
Reduction	O
)	O
system	O
;	O
VR-equipped	O
lenses	O
will	O
mount	O
and	O
function	O
,	O
but	O
without	O
image	O
stabilization	O
.	O
</s>
<s>
Eventually	O
Nikon	B-Algorithm
had	O
three	O
F4	O
models	O
that	O
were	O
distinguished	O
by	O
which	O
integrated	O
battery	O
pack	O
was	O
attached	O
.	O
</s>
<s>
The	O
Nikon	B-Algorithm
NASA	O
F4	O
Electronic	O
Still	O
Camera	O
was	O
one	O
of	O
the	O
first	O
and	O
rarest	O
fully	O
digital	O
cameras	O
.	O
</s>
<s>
The	O
camera	O
was	O
based	O
on	O
a	O
modified	O
F4	O
with	O
standard	O
F-mount	B-Architecture
and	O
had	O
a	O
digital	B-Algorithm
camera	I-Algorithm
back	I-Algorithm
with	O
a	O
monochrome	O
CCD	B-Algorithm
image	B-Algorithm
sensor	I-Algorithm
with	O
1024	O
x	O
1024	O
pixels	B-Algorithm
on	O
an	O
area	O
of	O
15	O
x	O
15mm	O
.	O
</s>
