NPhoto - - Test Team -

Aut­o­fo­cus is a lit­tle slug­gish and more noisy than in any other lens on test. As in the Sigma lenses and the Tam­ron 18-270mm, the fo­cus ring ro­tates dur­ing aut­o­fo­cus, so you have to be care­ful to keep your fin­gers out of the way. The zoom ring feels slightly stiff, too, but there’s no hint of zoom creep. Over­all im­age qual­ity is pretty good for a su­per­zoom, though with­out sta­bil­i­sa­tion you’ll need steady hands, es­pe­cially at the long end of the zoom range. Com­pared with the first in­car­na­tion of the Sigma 18-200mm OS (OS stands for Op­ti­cally Sta­bilised), the sec­ond edi­tion was 12mm shorter and weighed 120g less. This third edi­tion is 2mm shorter again and a fur­ther 60g lighter, mak­ing it the sec­ond light­est in our test. It weighs 430g, com­pared with the Tam­ron 18-200mm’s 405g. What def­i­nitely isn’t short is its name, but what do all those let­ters and num­bers ac­tu­ally mean?

As with many su­per­zooms, the widest aper­ture shrinks from f/3.5 to f/6.3 as you go through the zoom range and, as a ‘DC’ lens, it’s de­signed for cam­eras with DX-for­mat

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