The Sigma 18-35mm f/1.8 is the first wide angle zoom lens to achieve a 1.8 aperture. It incorporates a molded glass aspherical lens with
Special Low Dispersion (SLD) glass to compensate for lens flare and aberrations. A nice feature on this lens is that the zoom and focusing are internal, and the Hyper Sonic Motor ensures fast and quiet focusing. The Sigma 18-35mm is a DC lens, which means it should be used on DX cameras.
Number of diaphragm blades: 9 <br/> Minimum f/stop: 16 <br/> Maximum f/stop: 1.8 <br/> Closest focusing distance: 11 in. <br/> Weight (approx.): 28 oz. <br/> Dimensions (approx.): 3.1 in. x 4.8 in. <br/> External front filter: 72mm (does not rotate)
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