The built-in flash on Canon's Prosumer DSLR lines is generally considered inadequate for most serious purposes. The Canon accessory flashes such as the Canon Speedlite 550EX Flash are much more versatile and powerful. The 550EX gets the light far above the lens (prevents half-moon shadows in your pictures) and does a much better job preventing the red-eye effect. The 550EX allows bouncing the flash off of a standard height ceiling or off of other reflectors such as white walls, white foamcore, Photoflex and other commercial reflectors, ... The 550EX also allows the use of light softening and modifying accessories such as the Lumiquest Big Bounce, the Lumiquest Softbox, and the Sto-Fen Omnibounce.
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