Timelapse up to 9,999 frames, additionally timelapse videos. New Timelapse / Interval Timer Exposure Smoothing
New customizable 'Picture Control 2.0' options: Flat affecting dynamic range (preserve highlights and shadows), Clarity affecting details. Other settings affecting exposure, white balance, sharpness, brightness, saturation, hue; allowing custom curves to be created, edited, saved, exported and imported
New 3.2" 1229k-dot (RGBW, four dots per pixel: extra white dot) VGALCD display with "Split-screen display zoom" function
USB 3.0, HDMI C (mini), Nikon 10-Pin interfaces and 3.5mm/1/8″ stereo headphone + 3.5mm/1/8″ stereo microphone connectors
"Superior" resistance to dust and water (Nikon claim)
Various Nikon Speedlight or third-party flash units. Also working as commander for Nikon Creative Lighting System wireless (slave) flash.
Third-party radio (wireless) flash control triggers
Tethered shooting with Nikon Camera Control Pro 2, third-party solutions or open-source software and apps
Other accessories from Nikon and third parties, including protective cases and bags, eyepiece adapters and correction lenses, and underwater housings.
Nikon Cinema is also offering price saving sets:
Nikon D810 animator's kit including the AF-S VR Micro-NIKKOR 105mm f/2.8G, Dragonframe 3.5 software, power supply and cables
Nikon D810 DSLR Filmmaker's Kit including three fast prime lenses, a portable HDMI recorder using "Pro" codecs, but not capable for storing uncompressed video, ME-1 Stereo Microphone, filters, batteries and cables
On August 19, 2014, Nikon acknowledged a problem reported by some users, of bright spots appearing in long-exposure photographs as well as "in some images captured at an Image area setting of 1.2x (30x20)." Existing owners of D810 cameras were asked to visit a website to determine whether their camera could be affected, on the basis of serial numbers. Repairs would be made by Nikon free of charge. If bright spots still appear in images after servicing, Nikon recommends enabling Long exposure NR. Products already serviced have a black dot inside the tripod socket.
An astrophotography variant with a special infrared filter capable of deep red / near infrared and with special software tweaks like long-exposure modes up to 15 minutes, virtual horizon indicator and a special Astro Noise Reduction software was announced February 10, 2015. The D810A's IR filter is optimized for H-alpha (Hα) red tones, resulting in four times greater sensitivity to the 656 nm wavelength than the D810. In comparison, Canon's astrophotography DSLR's 20Da and 60Da Hα sensitivity was 2.5 times and 3 times (respectively) more than the standard 20D / 60D. The D810A additionally has 1.39 stops advantage due to the larger image sensor format – resulting in better than 2 stops sensitivity advantage giving over four times faster exposure times compared to the Canon 20Da/60Da.
Although the D810A can be used for normal photography, due to the deep red / near infrared sensitivity the in-camera white balance may fail in case of fluorescent light or difficult cases with very strong infrared light – requiring an external infrared filter. Nikon published an D810A astrophotography guide which recommends live view focussing with 23x enlarged selected areas and a gallery showing the mostly small effects to the color reproduction in "normal" photos.
A review concludes that especially the D810A long exposure noise is superior compared to the D800E and other Nikon fullframes, and shows effects of the increased H-alpha sensitivity. Color balance of "normal" photos seems mostly correct, except comparatively hotter objects with strong infrared radiation and a bit more purple in sunsets.