Nikon D810A FX-format Digital SLR 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