This Sigma lens came out around 2004 as a reasonably priced higher-end zoom lens specifically designed for digital SLR cameras. It has a maximum aperture of f2.8 throughout the entire zoom range, which is its claim to fame to being considered a higher-end lens. The reason it was lower priced probably had something to do with the unusual zoom range, 24mm being 6mm short of most standard kit zoom lens ranges (18-55mm). The barrel material is standard EX fair, which is either a love or hate thing for users. I personally am not too fond of Sigma’s textured paint on plastic that they use. I bought this lens many years ago and just recently traded it in to help pay for a new camera body. My justification was that I rarely use it as I prefer prime lenses in the focal lengths it covers. Technical specifications for the lens: Lens Mount: K-mount Lens Construction: 15 groups, 16 elements Angle of View: 84.1 – 39.6 degrees Aperture: f2.8 constant Number of Diaphragm Blades: 9 Minimum Apert
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