Mint sigma 50-150 for sale, bought last year, excellent condition, sharp copy, boxed and protective case.
This lens is compact (its DC notation means its designed for an APS-C size imaging circle) and fast (an F2.8 maximum aperture) with a good telephoto zoom range, HSM focusing motor and four SLD (Low Dispersion) glass elements to reduce chromatic aberrations. This lens on a 1.5x crop digital SLR (such as the Nikon D300) would provide an equivalent FOV of 75 to 225 mm