Nikon announces its long-awaited DSLR camera designed exclusively for astrophotography. The Nikon D810A ($3,800) features an expansive 36.3-megapixel full-frame CMOS detector with 4.88-micronsquare pixels and an improved infrared-blocking filter that transmits 4X more hydrogen-alpha light than standard DSLR cameras. This modification enables users to record the reddish hydrogen-alpha nebulosity prevalent in the night sky, The camera incorporates an electronic shutter model to eliminate vibrations, and long-exposure M modes of up to 15 minutes without the need of a cable release. The D810A includes a special low-light live preview function with exposures of up to 30 seconds to aid focusing and composing your images. Additional features include increased ISO speeds up to 12,800 (expandable to ISO 51,200) and a 23X live focus zoom feature. See the manufacturer's website for more details.
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