Nikon D810A FX-format Digital SLR

The Nikon D810A is an ultra high-definition model that boasts the most efficient image quality in the history of Nikon digital SLR cameras with an effective pixel count of 36.3-million pixels, a Nikon FX-format CMOS sensor with out a optical low-pass filter and the contemporary image-processing engine, EXPEED 4. It makes the among the fantastic rendering capabilities of the D810, whilst utilizing an optical filter adopted to enable beautiful reproduction of vivid reds in images of nebulae that emit H-alpha light, something very difficult with run-of-the-mill digital SLR cameras. The optical filter at the front surface of the image sensor is capable of four times greater transmission of H-alpha light than is that used with the D810. This enables clear and vivid reproduction of the strong red H-alpha light emitted by nebulae and galaxies.D810A specifications have also been modified from those of the D810 to make astrophotography easier and more enjoyable. Modifications include the addition of a long-exposure manual (M) mode that supports exposure times up to 900 s and a live view preview function that makes focusing and composing images easier with display of a preview at a shutter speed of 30 s when an exposure time longer than 30 s is specified. As well as, the D810A has inherited a lot of functions from the D810 that are convenient for astrophotography, including the ability to enlarge the view through the lens displayed in the camera monitor all through live view up to approximately
36.3MP FX-format CMOS sensor without an Optical Low Pass Filter (OLPF)
ISO 200 to 12,800; Lo1 (ISO 32) to Hi2 (ISO 51,200)
Virtual preview for more accurate focusing and composition for exposure longer than 30 seconds
Employs an optical IR cut filter with specific transmission characteristics (characteristics in the 656nm range), enabling the capture of nebulae and distant galaxies that emit H-alpha wavelength in red