<s>
The	O
Nikon	B-Algorithm
D810	O
is	O
a	O
36.3-megapixel	O
professional-grade	O
full-frame	B-Algorithm
digital	B-Device
single-lens	I-Device
reflex	I-Device
camera	I-Device
produced	O
by	O
Nikon	B-Algorithm
.	O
</s>
<s>
Compared	O
to	O
the	O
former	O
D800/D800E	O
it	O
offers	O
an	O
image	B-Algorithm
sensor	I-Algorithm
with	O
a	O
base	O
sensitivity	O
of	O
ISO	O
64	O
and	O
extended	O
range	O
of	O
ISO	O
32	O
to	O
51	O
,	O
200	O
,	O
an	O
Expeed	B-Algorithm
processor	O
with	O
noise	O
reduction	O
with	O
claimed	O
1	O
stop	O
noise	O
improvement	O
,	O
doubled	O
buffer	B-General_Concept
size	I-General_Concept
,	O
increased	O
frame	O
rate	O
and	O
extended	O
battery	B-Architecture
life	I-Architecture
,	O
improved	O
autofocus	O
–	O
now	O
similar	O
to	O
the	O
D4S	B-Algorithm
,	O
improved	O
video	O
with	O
1080p	O
60	O
fps	O
and	O
many	O
software	O
improvements	O
.	O
</s>
<s>
The	O
D810	O
was	O
succeeded	O
by	O
the	O
Nikon	B-Algorithm
D850	I-Algorithm
in	O
August	O
2017	O
and	O
was	O
listed	O
as	O
discontinued	O
in	O
December	O
2019	O
.	O
</s>
<s>
Frame	O
rate	O
(	O
photo	O
)	O
increased	O
to	O
5	O
fps	O
FX	O
(	O
full-frame	B-Algorithm
,	O
DX	O
up	O
to	O
7	O
fps	O
)	O
.	O
</s>
<s>
Autofocus	O
equivalent	O
to	O
D4S	B-Algorithm
,	O
also	O
Group	O
Area	O
mode	O
:	O
uses	O
five	O
AF	O
sensors	O
together	O
.	O
</s>
<s>
Timelapse	B-Application
up	O
to	O
9,999	O
frames	O
,	O
additionally	O
timelapse	B-Application
videos	O
.	O
</s>
<s>
Nikon	B-Algorithm
WT-4/WT	O
-4A	O
or	O
WT-5/WT	O
-5A	O
(	O
also	O
UT-1	O
network	O
)	O
Wireless	O
Transmitter	O
for	O
WLAN	B-Architecture
.	O
</s>
<s>
Nikon	B-Algorithm
Wireless	O
remote	B-Protocol
control	I-Protocol
or	O
third-party	O
solutions	O
.	O
</s>
<s>
Nikon	B-Algorithm
GP-1	O
or	O
GP-1A	O
GPS	O
Unit	O
for	O
direct	O
GPS	O
geotagging	O
.	O
</s>
<s>
Third-party	O
solutions	O
partly	O
with	O
three-axis	O
compass	B-Language
,	O
data-logger	O
,	O
bluetooth	B-Protocol
and	O
support	O
for	O
indoor	O
use	O
are	O
available	O
from	O
Solmeta	O
,	O
Dawn	O
,	O
Easytag	O
,	O
Foolography	O
,	O
Gisteq	O
and	O
Phottix	O
.	O
</s>
<s>
Various	O
Nikon	B-Algorithm
Speedlight	O
or	O
third-party	O
flash	O
units	O
.	O
</s>
<s>
Also	O
working	O
as	O
commander	O
for	O
Nikon	B-Algorithm
Creative	O
Lighting	O
System	O
wireless	O
(	O
slave	O
)	O
flash	O
.	O
</s>
<s>
Other	O
accessories	O
from	O
Nikon	B-Algorithm
and	O
third	O
parties	O
,	O
including	O
protective	O
cases	O
and	O
bags	O
,	O
eyepiece	O
adapters	O
and	O
correction	O
lenses	O
,	O
and	O
underwater	O
housings	O
.	O
</s>
<s>
At	O
the	O
time	O
of	O
its	O
release	O
,	O
the	O
Nikon	B-Algorithm
D810	O
became	O
the	O
Dxomark	B-Algorithm
image	B-Algorithm
sensor	I-Algorithm
leader	O
ahead	O
of	O
the	O
Nikon	B-Algorithm
D800E	I-Algorithm
and	O
received	O
many	O
reviews	O
.	O
</s>
<s>
On	O
August	O
19	O
,	O
2014	O
,	O
Nikon	B-Algorithm
acknowledged	O
a	O
problem	O
reported	O
by	O
some	O
users	O
,	O
of	O
bright	O
spots	O
appearing	O
in	O
long-exposure	O
photographs	O
,	O
as	O
well	O
as	O
"	O
in	O
some	O
images	O
captured	O
at	O
an	O
Image	O
area	O
setting	O
of	O
1.2	O
×	O
(	O
30×20	O
)	O
.	O
"	O
</s>
<s>
Repairs	O
would	O
be	O
made	O
by	O
Nikon	B-Algorithm
free	O
of	O
charge	O
.	O
</s>
<s>
If	O
bright	O
spots	O
still	O
appear	O
in	O
images	O
after	O
servicing	O
,	O
Nikon	B-Algorithm
recommends	O
enabling	O
Long	O
exposure	O
NR	O
.	O
</s>
<s>
In	O
comparison	O
,	O
Canon	O
's	O
astrophotography	O
DSLRs	B-Device
20Da	O
and	O
60Da	O
Hαsensitivity	O
was	O
2.5times	O
and	O
3times	O
(	O
respectively	O
)	O
more	O
than	O
the	O
standard	O
20D	B-Algorithm
/	O
60D	B-Algorithm
.	O
</s>
<s>
TheD810A	O
additionally	O
has	O
1.39stops	O
advantage	O
due	O
to	O
the	O
larger	O
image	B-Algorithm
sensor	I-Algorithm
format	O
resulting	O
in	O
better	O
than	O
2stops	O
sensitivity	O
advantage	O
giving	O
over	O
four	O
times	O
faster	O
exposure	O
times	O
compared	O
to	O
the	O
Canon20Da/60Da	O
.	O
</s>
<s>
Although	O
the	O
D810A	O
can	O
be	O
used	O
for	O
normal	O
photography	O
,	O
due	O
to	O
the	O
deep	O
red	O
/	O
near	O
infrared	O
sensitivity	O
the	O
in-camera	O
white	B-Algorithm
balance	I-Algorithm
may	O
fail	O
in	O
case	O
of	O
fluorescent	O
light	O
or	O
difficult	O
cases	O
with	O
very	O
strong	O
infrared	O
light	O
requiring	O
an	O
external	O
infrared	O
filter	O
.	O
</s>
<s>
Nikon	B-Algorithm
published	O
an	O
D810A	O
astrophotography	O
guide	O
that	O
recommends	O
live	O
view	O
focusing	O
with	O
23×enlarged	O
selected	O
areas	O
and	O
a	O
gallery	O
showing	O
the	O
mostly	O
small	O
effects	O
to	O
the	O
color	O
reproduction	O
in	O
"	O
normal	O
"	O
photos	O
.	O
</s>
<s>
A	O
review	O
concludes	O
that	O
especially	O
the	O
D810A	O
long	O
exposure	O
noise	O
is	O
superior	O
compared	O
to	O
the	O
D800E	O
and	O
other	O
Nikon	B-Algorithm
fullframes	O
,	O
and	O
shows	O
effects	O
of	O
the	O
increased	O
H-alpha	O
sensitivity	O
.	O
</s>
<s>
Color	B-Algorithm
balance	I-Algorithm
of	O
"	O
normal	O
"	O
photos	O
seems	O
mostly	O
correct	O
,	O
except	O
comparatively	O
hotter	O
objects	O
with	O
strong	O
infrared	O
radiation	O
and	O
a	O
bit	O
more	O
purple	O
in	O
sunsets	B-Application
.	O
</s>
