The EOS 5D's full-frame CMOS sensor records 4,368 x 2,912 pixels-that's 12.8 Megapixels, larger than many other companies' top-of-the-line sensors. The same size as a 35mm image on a traditional camera, the sensor operates without a conversion factor. This is perfect for taking advantage of the spectacular optics in Canon's L-series, and will be a joy for wide-angle enthusiasts who can make the most of their wide-angle lenses. This new CMOS sensor, designed in-house by Canon, provides smooth, high-resolution images similar to the EOS-1Ds Mark II but in a more compact body. Two automatic noise reduction features maximize the effectiveness of the EOS 5D's on-chip noise reduction. Noise reduction can be activated when noise is detected or it will simply come into play on any exposure of 1 second or longer.