EF & EF-S Lenses EOS Rebel T1i is compatible with all Canon lenses in the EF and EF-S lineup, ranging from ultra-wide angle to super telephoto lenses. Canon lenses employ advanced optical expertise and micron-precision engineering to deliver unprecedented performance in all facets of the photographic process. Special optical technologies, such as Aspherical, ultra-low dispersion, or fluorite elements are featured in the universally acclaimed L-series lenses, and Canon's Optical Image Stabilizer technology is featured in select lenses, including the EF-S 18-55mm IS lens bundled with the EOS Rebel T1i, to minimize the effect of camera shake. With Canon lenses, you can truly maximize the quality and performance of the EOS camera.
Flash Photography The EOS Rebel T1i features Canon's acclaimed E-TTL II flash metering system. With any EX-series Speedlite, E-TTL II provides reliable flash output whether shooting fill-in flash pictures in sunlight or using flash in total darkness. With E-TTL II, the exact same 35-zone metering sensor used for measuring ambient light is also used for flash metering - giving even finer metering command of the image area. If you prefer a broader area for flash metering, there's a menu setting to change to "Average" flash metering - where the entire 35-zone area is measured evenly for flash exposure.