<s>
The	O
Nikon	B-Algorithm
D4	I-Algorithm
is	O
a	O
16.2-megapixel	O
professional-grade	O
full	B-Algorithm
frame	I-Algorithm
(	O
35mm	O
)	O
digital	B-Device
single-lens	I-Device
reflex	I-Device
camera	I-Device
(	O
DSLR	B-Device
)	O
announced	O
by	O
Nikon	B-Algorithm
Corporation	O
on	O
6	O
January	O
2012	O
.	O
</s>
<s>
It	O
succeeds	O
the	O
Nikon	B-Algorithm
D3S	I-Algorithm
and	O
introduces	O
a	O
number	O
of	O
improvements	O
including	O
a	O
16.2	O
megapixel	O
sensor	O
,	O
improved	O
auto-focus	O
and	O
metering	O
sensors	O
and	O
the	O
ability	O
to	O
shoot	O
at	O
an	O
extended	O
ISO	O
speed	O
of	O
204,800	O
.	O
</s>
<s>
It	O
is	O
the	O
first	O
camera	O
to	O
use	O
the	O
new	O
XQD	B-Device
memory	O
cards	O
.	O
</s>
<s>
It	O
was	O
replaced	O
by	O
the	O
Nikon	B-Algorithm
D4S	I-Algorithm
as	O
Nikon	B-Algorithm
's	O
flagship	O
camera	O
.	O
</s>
<s>
The	O
Nikon	B-Algorithm
D4	I-Algorithm
is	O
aimed	O
at	O
sports	O
and	O
action	O
photographers	O
and	O
photojournalists	O
.	O
</s>
<s>
1080p	O
Full	O
HD	O
movie	O
mode	O
at	O
24	O
fps	O
worldwide	O
and	O
25	B-Language
or	O
30	O
depending	O
on	O
region	O
,	O
720p	O
at	O
25/50	O
or	O
30/60	O
fps	O
,	O
HDMI	B-Protocol
HD	O
video	O
out	O
with	O
support	O
of	O
uncompressed	B-Device
video	I-Device
output	O
,	O
stereo	O
monitor	O
headphone	O
out	O
,	O
and	O
stereo	O
input	O
(	O
3.5-mm	O
diameter	O
)	O
with	O
manual	O
sound	O
level	O
control	O
.	O
</s>
<s>
The	O
D4	O
achieved	O
the	O
fourth-best	O
result	O
in	O
the	O
DXOmark	O
sensor	O
rating	O
,	O
only	O
beaten	O
by	O
two	O
versions	O
of	O
the	O
Nikon	B-Algorithm
D800	I-Algorithm
and	O
a	O
medium	O
format	O
,	O
80-megapixel	O
camera	O
(	O
Phase	O
One	O
IQ180	O
)	O
.	O
</s>
