The usual macro focal lengths (50mm, 60mm, 100mm, and 105mm in 35mm) don't cut it for many photographers. They prefer a longer lens for two reasons: It provides more working distance between the camera and a small subject; and its narrower angle of view gives you a smoother, less mottled background to set off your subject. Though this new Sigma macro delivers its nominal focal length on a 35mm or full-frame D-SLR, it produces the equivalent of 225mm or 240mm on a Nikon or Canon D-SLR with an APS-C-sized image sensor. About $600.
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