Nikon Corporation is developing new firmware for its Nikon D4S, Nikon D810, and Nikon D750 DSLR cameras, for release this summer, 2015. The new firmware will provide support for timecode and recording command functions with HDMI output to external recorders (make them able to recognize start and stop of recording).

D810 truly delivers. Not only do you have the superb handling you'd expect of a Nikon DSLR, coupled with the spectacular resolution of the D800 and D800E -- the Nikon D810 gives you all of this plus truly usable high-sensitivity options that, in our testing, bested the Sony A7R to produce usable 8" x 10" prints at all the way up to ISO 25,600. Even at ISO 51,200, we found the D810 quite capable of good 4" x 6" prints -- perhaps even larger, for your less critical shots.

http://www.imaging-resource.com/PRODS/nikon-d810/nikon-d810A.HTM

New firmware

An External recording control option has been added to the HDMI item in the SETUP MENU. If the camera is connected via HDMI to a third-party recorder that supports the Atomos Open Protocol (the Atomos SHOGUN, NINJA2, or NINJA BLADE), selecting On allows camera controls to be used to start and stop recording. More information is available in a supplementary manual.

Fixed the following issues:

• Incorrect distances were shown in the camera playback info display for photographs taken with an optional flash unit in distance-priority manual (GN) mode.
• The brightness of the live view photography display would not change when a command dial was rotated to adjust exposure compensation with On (Auto reset) selected for b Metering/exposure > b4 Easy exposure compensation > Easy exposure compensation in the CUSTOM SETTING MENU.
• Although the preview button would stop the lens down to maximum aperture when assigned the Preview role, the maximum aperture indicator would not appear in the monitor.
• In rare cases, the shutter would not be released when the user attempted to take photographs in movie live view.
• About 4 seconds of static could be heard on audio recorded with external HDMI recorders during movie live view.
• The shutter speed, aperture, and ISO sensitivity displayed in the monitor during movie live view would differ from values in the final movie file.
• Volume could sometimes not be adjusted if movies were played with indicators hidden during full-frame playback (None (image only)).
• Exposure compensation would fail to produce the desired results if a negative value was selected when NEF (RAW) images were processed using the NEF (RAW) processing option in the RETOUCH MENU.
• Images would in rare cases fail to record correctly with HDR (high dynamic range) selected in the SHOOTING MENU.
• If On was selected for Exposure smoothing during interval timer photography, every frame after the first would be overexposed.
• File numbers were not assigned in the proper sequence.
• In some languages, characters or parts of characters would be missing from the SETUP MENU > Location data > Position display.
• In some languages, characters or parts of characters would be missing from the SETUP MENU > AF fine-tune > List saved values display.
• Some help text has been changed.

http://downloadcenter.nikonimglib.com/en/download/fw/156.html

https://www.ephotozine.com/article/nikon-d810a-dslr-review-28371

https://www.flickr.com/photos/martin-rousseau/sets/72157667106171742

http://www.dpreview.com/reviews/nikon-d810

Nikon D810 vs Canon 5D Mark IV vs Sony A7R II

Nikon D810 firmware version 1.12

• The WT-7 wireless transmitter is now supported.
• Fixed the following issues:
  • Multiple exposures were not recorded correctly.
  • Incorrect histograms would be displayed for some images viewed in the RGB histogram display during playback.
  • If On was selected for Auto distortion control, distortion would appear at the edges of photos taken with NEF (RAW) + JPEG fine selected for Image quality and Medium selected for JPEG/TIFF recording > Image size.
  • Photos taken immediately after lenses were exchanged would not be recorded at the correct exposure.
  • The protect icon did not display correctly.
  • If On was selected for Auto distortion control, the camera would stop responding when the user attempted to take pictures with NEF (RAW) + JPEG fine selected for Image quality, Small selected for NEF (RAW) recording > Image size, and RAW primary - JPEG secondary selected for Secondary slot function.
  • Shutter speeds for the electronic front-curtain shutter would sometimes be faster than 1/2000 s.
  • Pictures would sometimes not be recorded.

http://downloadcenter.nikonimglib.com/en/download/fw/218.html

Nikon D810 official $1000 price drop

https://www.adorama.com/inkd810.html

Nikon D810 DSLR with AF-S NIKKOR 24-120mm f/4G ED VR Lens kit now down to $2496

https://www.adorama.com/inkd810k1.html