The Nikon D810A has been designed for Astrophotography. Thus its not Recommended for General Purpose Photography. The regular DSLR cameras are designed to block IR (infra red) ray, since it cause red cast in an image. You will see these unusual red cast if you use a High density ND filter for long exposure. Nikon D810A uses a IR cut filter but allows the transmission of 656 nm range for capturing photos of distant galaxies as a result it will create more reddish picture. You can see the reddish cast in the comparison of images taken with with D810A & D810 below.
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| Sensor and Resolution | ||
| Sensor | 35.9 x 24mm | 35.9 x 24mm |
| 36.3MP FX-format CMOS sensor without an Optical Low Pass Filter (OLPF) | 36.3MP FX-format CMOS sensor without an Optical Low Pass Filter (OLPF) | |
| New Functionality of D810A | ||
| IR Cut Filter | The D810A 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, which can be difficult to capture with an ordinary digital SLR camera. | Optimized for General Photography applications |
| ISO Sensitivity Range | 200 to 12,800 Lo1 (ISO 32) to Hi2 (ISO 51,200) | Optimized for General Photography applications |
| White Balance | Although white balance has been designed and adjusted to retain the same performance as that of the D810, color reproduction might be different for an image taken under fluorescent light or difficult scenes due to the increased IR transmission characteristics of the D810A. The resulting image may be much more reddish than the actual color. Because an appropriate color reproduction cannot be obtained, D810A is not recommended for general photography | Optimized for General Photography applications |
| P, S, A, M, M* | Long Exposure Manual Mode Added. Available shutter speeds in new M* mode: (exposure time): 4, 5, 8, 10, 15, 20, 30, 60, 120, 180,240, 300, 600, 900 seconds (15 minutes), Bulb, Time | Standard P, S, A, M Modes to 30 seconds |
| Virtual Live View Exposure Preview | A virtual preview will be displayed for more accurate focusing and composition for exposure longer than 30 seconds (up to 900 seconds) | Live View standard operation, preview will appear dark on exposure longer than 30 seconds |
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● All other features on D810A and D810 are the same ● |
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Related News : Nikon releases D810A for Astrophotography