Sigma 18-200mm f/3.5-6.3 DC Macro OS HS M | C £290/$400


NPhoto - - Gear Zone -

This 18-200mm lens is the small­est su­per­zoom on test, mea­sur­ing a mere 71x86mm. It’s also just 30g heav­ier than the un­fea­si­bly light­weight Tam­ron 18-200mm, de­spite fea­tur­ing a metal, rather than plas­tic, mount­ing plate. How­ever, as with the larger Sigma 18-300mm C-class lens, the mount has no weather-seal ring.

Mul­ti­ple as­pher­i­cal el­e­ments help in down­siz­ing the de­sign, while SLD (Spe­cial Low Dis­per­sion) el­e­ments boost sharp­ness and con­trast, and help re­duce fring­ing. Both Sigma lenses use an ul­tra­sonic mo­tor for aut­o­fo­cus. This helps keep size and weight to a min­i­mum, but the fo­cus ring ro­tates dur­ing aut­o­fo­cus and there’s no manual fo­cus over­ride. AF also isn’t quite as whis­per-quiet as with Nikon’s ring-type sys­tems.


The op­ti­cal sta­bi­lizer works well and comes com­plete with auto pan­ning de­tec­tion. Wideaper­ture sharp­ness isn’t quite as good as from the less ex­pen­sive Tam­ron 18-200mm at short to mid zoom set­tings, but about equal at the long end.

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