Canon Press: New CMOS Image Sensor and DIGIC II Image Processor
The EOS 20D digital SLR includes Canon's latest CMOS image sensor technology as well as the new DIGIC II Image Processor. The CMOS features high-speed 4-channel data reading, brilliant new microlens technology, a 2nd generation, on-chip noise-reduction circuit, and low-noise, high-speed amp, which produces accurate color, extremely low noise and fast recording even at ISO's of 400 and above. Canon's DIGIC II image processor is without question, the most powerful imaging processor that the company has ever put into a digital camera. It boasts improved color reproduction of high-saturation, bright subjects, improved auto white balance precision, and wider dynamic range in highlight areas. In addition to its image quality improvements, the DIGIC II chip is also responsible for speeding up camera performance in areas such as start-up time, autofocus calculation, card-writing speed, direct printing and data transfer speed through the new USB 2.0 High Speed interface.
Rob Galbraith Review: An 8.50 million pixel, Canon-designed and manufactured CMOS image sensor with an 6.4µm pixel pitch, bayer pattern RGB filter array, high-efficiency microlenses and multi-layer optical low pass filter generates 8.2 million actual image pixel photos at full resolution. The sensor's data is read out in 4 channels, clearing it quickly enough to allow for the camera's 5 fps shooting rate. Canon is promising that, because of the newly-developed noise processing and other sensor design changes that 20D noise levels at ISO 1600 will roughly match the 10D at ISO 400.
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We can say, after shooting a soccer match at ISO 3200 with a preproduction EOS 20D in available darkness, that this camera's upper ISO range is really impressive. In fact, quickly comparing side-by-side frames at ISO 3200 from an EOS-1D Mark II and EOS 20D, the 20D's noise levels appear to be slightly lower. But this assessment should be considered preliminary at best.
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In addition to the increased resolution and promised reduced noise, the DIGIC II processing chip is said to bring about "improved color reproduction of high-saturation, bright subjects, improved auto white balance precision, and wider dynamic range in highlight areas."