Canon's all-new large area CMOS (complementary metal oxide semiconductor) Sensor captures images with exceptional clarity and tonal range, and offers the most pixels in its class. This 2nd generation APS-C size sensor (22.5 x 15.0mm) has the same 3:2 ratio as film cameras, enabling an effective angle of view that is 1.6x the normal EF Lens focal length. The EOS 20D has an extensive ISO range (from 100 to 1600 plus ISO 3200 in extended mode),and the sensor features a newly developed set of narrow-gap microlenses and noise reduction circuits to improve performance at high ISOs, and optimized photodiode configurations for improved performance at all ISOs. This results in larger, clearer, sharper and more detailed photographs right from the start.
Second Generation DIGIC II Image Processor The EOS 20D benefits from Canon's in-house development: The DIGIC II Image Processor was developed originally for the EOS-1D Mark II and enhances every aspect of image capture. Information captured by the CMOS Sensor is processed and assembled into images of exceptional quality by this new Image Processor. With the DIGIC II Image Processor on board, photographers can expect precise, natural colors, and spot-on white balance in any number of lighting situations. Through sophisticated signal processing algorithms, the DIGIC II Image Processor even accelerates all aspects of image capture, while consuming less energy than other processors.