Canon's ring-type USM gives silent but quick AF, along with full-time manual focus. Moreover, with dust- and moisture-resistant construction, this is a durable yet sophisticated lens that meets the demands of advanced amateur photographers and professional photographers alike. Top Rated Gear: Canon EF 24-105mm f/4L IS USM AutoFocus Wide Angle 28-105mm standard zoom lens with f/3.5-4.5 maximum aperture for Canon SLR cameras ; Ring-type ultra-sonic monitor (USM) provides silent, high-speed autofocusing ; 1.6-foot close focusing distance; rotating zoom system; 58mm filter size ; Ideal for Canon EOS A2/Aw3 or ELAN 7 series cameras with built-in flashes

By the strictest definition of parfocal, the EF 24-105mm f/4 L Is is not such a lens. The EF 24-105mm f/4 L IS is a lens that can be "functionally parfocal." When long-time Canon technical advisor Chuck Westfall released a list of such lenses back in 2004, he later had to explain that the list was in the context of lenses focused at their

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canon ef 24 105mm f 4 l is