Sigma 150-500mm f/5-6.3 APO DG OS HSM

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We’ve given this now ob­so­lete lens a fourstar rat­ing and Great Value awards be­fore Re­leased: 2008 Price new: £700/$800 Price used: From £350/$500 For big tele­photo reach with­out a huge price tag, this Sigma is a long-stand­ing favourite. It boasts a much faster, ring-type ul­tra­sonic au­tofo­cus sys­tem and a more ef­fec­tive op­ti­cal sta­biliser than Nikon’s orig­i­nal AF VR 80-400mm. It also has a longer avail­able fo­cal length, equiv­a­lent to a whop­ping 750mm on the D7000 and other DX bod­ies.

Op­ti­cal high­lights in­clude three Spe­cial Low Dis­per­sion (SLD) el­e­ments to boost sharp­ness and con­trast while re­duc­ing colour fring­ing, and Sigma’s su­per multi-layer coat­ings to min­imise ghost­ing and flare. The lens is also well built, but lacks the weather seals fea­tured in Sigma’s cur­rent lenses.

At a shade un­der 1.8kg (3.9lbs), the lens is suf­fi­ciently light­weight for short pe­ri­ods of hand­held shooting, but comes with a mount­ing col­lar to at­tach it to a tri­pod or mono­pod. Key points Au­tofo­cus sys­tem The ring-type ul­tra­sonic AF sys­tem moves the small rear el­e­ments of the lens, for fast op­er­a­tion and ac­cu­rate track­ing of mov­ing ob­jects. Full-time man­ual over­ride is avail­able in Sin­gle AF mode. Dual-mode OS The op­ti­cal sta­biliser has two modes of op­er­a­tion, avail­able via a switch on the lens bar­rel. One is for static shooting, the other is for pan­ning. You can also switch it off. Tri­pod mount­ing col­lar Ev­ery­thing feels nicely bal­anced when the col­lar is at­tached to a tri­pod or mono­pod. Un­usu­ally, the foot is shaped so that it also works ef­fec­tively as a fin­ger grip for hand­held shooting. Specs El­e­ments/groups: 21/15 Aper­ture range: f/5 to f/22 Au­tofo­cus type: Ring-type USM Min­i­mum fo­cus dis­tance: 2.2m Max­i­mum mag­ni­fi­ca­tion: 0.19x Fil­ter thread: 86mm Di­men­sions: 95x252mm Weight: 1.78kg

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