The EOS 50D operates with such effortless speed that operation is nothing short of intuitive. With instant start-up times, speedy autofocus and minimal shutter lag, the EOS 50D is one of the fastest cameras available today. It can shoot up to 6.3 fps, in bursts of up to 90 JPEGs (using an UDMA CF card), 60 JPEGs (using a CF card) consecutively or 16 RAW files, so you'll never, ever miss a shot.
DIGIC 4 Image Processor
This next generation DIGIC 4 Image Processor offers finer details and even more natural color reproduction, compared with the previous DIGIC III Image Processor. Since Canon's DIGIC 4 chips use advanced signal processing technologies, they provide even faster operations, including write times to UDMA cards. It also enables Face Detection Live mode to detect and focus up to 35 face(s) to capture the best possible shot. Further, DIGIC 4 offers the improved Auto Lighting Optimizer that corrects brightness and contrast automatically, and Peripheral Illumination Correction for up to 40 EF lenses. DIGIC always maximizes performance between the capturing and recording stages of digital photography.
With some lenses, the peripheral AF points may become sensitive to either vertical or horizontal lines (they will not function as cross-type AF points). These lenses are: EF 35-80mm f/4-5.6, EF 35-80mm f/4-5.6 II, EF 35-80mm f/4-5.6 III, EF 35-80mm f/4-5.6 USM, EF 35-105mm f/4.5-5.6, EF 35-105mm f/4.5-5.6 USM, EF 80-200mm f/4.5-5.6 II, EF80-200 f/4.5-5.6 USM.