Re the new D810A from Nikon: "Capture the jewels of the night sky like never before with Nikon's first DSLR dedicated to long-exposure deep-sky astrophotography. Based on the award-winning full-frame D810, the D810A records the brilliant red tones of H-alpha emission nebulae with a level of detail and sharpness, wide dynamic range and rich tonality almost unimaginable until now. Reveal the faintest celestial objects with exposures up to 15 minutes long; and noise-free performance at ISO levels as high as 12,800." Format: FX (full frame 35mm) Megapizels: 36.3 Enhances Sensitivity: 656nm ISO: 200 - 12,800 Long Exposure Mode: 15 minutes See http://www.nikonusa.com/en/Nikon-Products/Product/dslr-cameras/D810A.html for further info. Alex