The Nikon D810A is designed for snapping shots of galaxies, stars and other space elements. The manufacturer warns it's not for general use--so look at the D810 if shooting stars isn't your specialty. The D810A keeps everything we like about the D810, but makes some adjustments for astrophotography.
The D810A includes an infrared cut filter that gives the camera the ability to better capture wavelengths common in astrophotography. Along with the usual set of manual modes, the D810A also has a long exposure manual mode, which allows for shutter speeds as slow as 15 minutes. A new Virtual Exposure Preview mode allows users to get a glimpse of what those long shutter speeds will look like, so they don't have to wait fifteen minutes before realizing their settings were off. The camera is compatible with Nikkor lenses as well as third-party adapters for telescopes.
The rest of the camera keeps the specs of the D810--so check out our D810 preview to get a complete picture.
There's not really much to compare the D810 to, but it looks to be an excellent option for shooting stars. The downside is that even the manufacturer warns it's not ideal for general use--making it a pricey camera for just one type of photography.
The Nikon D810 is expected out in May, 2015.