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Announced 10 February 2015, the Nikon D810A is the astrophotography version of the D810.
It changes the IR-cut filter to pass the hydrogen alpha line; it's four times as sensitive at 656 nanometers as the regular D810. Because of this filter modification, the D810A will give poor color rendition for normal photography, so you still need a regular DSLR for regular photography.
The D810A also has longer in-camera exposure settings to 15 minutes. (Nice, but so what; a stock F5 or F6 goes to 30 minutes.) All DSLRs ought to have shutter times to many minutes; but the makers prefer we have to purchase extra-cost remote releases and timers instead of simply putting longer exposures in the stock firmware for free. At least the D810A does go to 15 minutes.
ISO is from 200~12,800, 25,600 and 51,200.
Nikon's free Capture NX-D adds an option for Astro Noise Reduction for use with D810A files.
It should ship in late May 2015 to those who order it today.
The D810A is a D810 with a different IR-cut filter and slightly different firmware, otherwise it's the same camera.
Other than the spectral response, ISO range and long exposure time setting options, see my D810 Specifications for all the other specs.
Other than the spectral sensitivity, see my D810 Performance section for everything else about it.
You astro people know who you are. Canon has been offering the occasional astro version on and off for years, and now we can get an astro Nikon.
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