When it comes to wide-angle zooms, you have wide zooms, ultra-wide zooms and then you have Sigma's 8-16mm/f4.5-5.6 DC HSM, which with an angle-of-view range of 75.5° to 114.5° is the flat-out champ in its class. It's also quite responsive, feels really nice in your hand, is pleasingly sharp. Even at 8mm, it remains respectfully rectilinear when squared off to your subject.
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