The EOS Rebel T3i has an 18.0 Megapixel CMOS (Complementary Metal Oxide Semiconductor) sensor that captures images with exceptional clarity and tonal range and offers more than enough resolution for big enlargements or crops. This first-class sensor features many of the same new technologies as used by professional Canon cameras to maximize each pixel's light-gathering efficiency. Its APS-C size sensor creates an effective 1.6x field of view (compared to 35mm format).

DIGIC 4 Image Processor
The Canon DIGIC 4 Image Processor dramatically speeds up the entire EOS Rebel T3i DSLR's camera operations for intuitive operation and offers improvements in both fine detail and natural color reproduction. It works in concert with the EOS Rebel T3i DSLR's CMOS Image Sensor to achieve phenomenal levels of performance in nearly any situation.
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