New Technology for Outstanding Images. Outstanding Image Quality: New Canon 12.2 Megapixel CMOS sensor, DIGIC III Image Processor, 14-bit conversion for smooth tone, gradations, extensive noise reduction technology, and new Auto Optimization for superior highlight-shadow control. Canon's CMOS sensor captures images with exceptional clarity and tonal range, and offers the most pixels in its class. It offers many of the same new technologies to maximize each pixel's light gathering efficiency that were first seen with the professional EOS-1D Mark III model. It's an APS-C size sensor (22.2 x 14.8mm), and there's an effective 1.6x increase in the lens's marked focal length when attached. Canon's DIGIC III Image Processor dramatically enhances image quality and speeds up all camera operations for intuitive operation. It works in concert with the EOS Rebel XSi's sensor to achieve unprecedented levels of performance in all lighting situations.