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Consider that the 24-70mm f/2.8 lens for a DX format camera becomes a 37mm to 107mm lens with Nikon's 1.52x FOV factor. it takes a 16,17,or 18mm bottom end to create anything resembling real wide-angle on a DX Nikon. And that is why there are 16-85mm, and 17-55, and 18-105,18-135,18-140,and 18-200 mm lenses from Nikon, for DX cameras. Jan 23, 2009 · The Sigma 18-200mm f/3.5-6.3 DC OS HSM is the latest in the company's long line of superzooms, which stretches back to the early 1990s and a series of 28-200mm (and later 28-300mm) lenses for 35mm SLRs.