NPhoto - - Test Team -

There’s not much to choose be­tween the two Sigma lenses in terms of per­for­mance. Lev­els of dis­tor­tion and colour fring­ing are con­trolled fairly well in both cases. The 18-250mm is slightly sharper in the 18-200mm seg­ment of its zoom range, but drops off no­tice­ably at its long­est tele­photo set­ting. Be­fore the ad­vent of the Nikon 18-300mm VR, this lens boasted the big­gest zoom range of any su­per­zoom on the mar­ket. It still looks an at­trac­tive propo­si­tion, with an ‘ef­fec­tive’ range of 27-405mm and the in­clu­sion of Tam­ron’s VC (Vi­bra­tion Com­pen­sa­tion) sta­bil­i­sa­tion sys­tem, which is typ­i­cally ef­fec­tive. More­over, it’s a redesigned and more com­pact VC com­po­nent than in the orig­i­nal Tam­ron 18-270mm, which con­trib­utes to a smaller, more light­weight build.

Another up­grade in this edi­tion of the lens is the in­clu­sion of a PZD (Piezo Drive) aut­o­fo­cus sys­tem. It works in es­sen­tially the same way as the

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