At the heart of the D850 is a back-side illuminated (BSI) FX-format full-frame CMOS image sensor with 45.7 megapixels and no optical low-pass filter. A marvel of ingenuity, it achieves extraordinary image quality, enhanced light gathering efficiency, faster data readout and truer color with virtually no risk of moiréEXPEED 5 quickly processes all 45.7 megapixels of data for lower noise, wider dynamic range, subtle tonal and textural details, high-speed continuous shooting at approx. 9 fps1and full-frame 4K UHD movie recording.The lower the ISO, the greater the dynamic range. Like the D810 before it, the D850 has the lowest base ISO of any DSLR or mirrorless camera 2—ISO 64 (expandable down to ISO 32).Record 16:9 4K Ultra HD (3840x2160) in full frame glory using the total width of the D850’s back-side illuminated CMOS sensor. Take advantage of the large sensor size for clean output at high ISO and for shooting with zero crop factor with full-frame NIKKOR lenses3, including wide and ultra-wide angle lenses.