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