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The hottest Nikon-fit kit re­vealed, in­clud­ing a stun­ning new Sigma wide-an­gle

Sigm a 20mm f/1.4 DG HSM | A

Open wide and say Sigma

Wide-an­gle prime lens £850, $900

We’ve been very im­pressed by the f/1.4 prime lenses in Sigma’s new ‘Art’ se­ries, which in­clude the 24mm, 35mm and 50mm. The lat­est lens in the line-up, the new 20mm f/1.4, de­liv­ers an ul­tra-wide view­ing an­gle of 94.5 de­grees on full-frame bod­ies, while still re­tain­ing that wide f/1.4 max­i­mum aper­ture. De­liv­er­ing that re­quires a dou­ble as­pher­i­cal lens el­e­ment that’s both large and very com­plex.

The op­ti­cal path is also rel­a­tively com­plex for a prime lens, fea­tur­ing no fewer than 15 el­e­ments in 11 groups. Aut­o­fo­cus is ring-type ul­tra­sonic, and the f/1.4-16 aper­ture range is con­trolled via a nine-blade di­aphragm. The min­i­mum fo­cus dis­tance is pretty short, at 0.28m, which en­ables a max­i­mum mag­ni­fi­ca­tion ra­tio of 0.14x. Sigma claims that the high­pre­ci­sion, ad­vanced op­ti­cal de­sign min­imises dis­tor­tion, lat­eral chro­matic aber­ra­tion (fring­ing) and sagit­tal coma flare (a sort of dis­tor­tion found at the edge of im­ages, where points of light take on a comet shape), while also keep­ing vi­gnetting to a min­i­mum. It’s a sub­stan­tial lens at 91x130mm and 950g, and if pre­vi­ous Art lenses are any in­di­ca­tion, build qual­ity and per­for­mance should be ex­cel­lent.

FIRST IM­PRES­SIONS: We’re ex­pect­ing this wide-an­gle lens to be some­thing ex­tra spe­cial.

Like SIGMA’s other Art SERIE S lenses, the 20mm comes with a hood and soft case, and is com­pat­i­ble with Sigma’s op­tional USB dock and mount con­ver­sion ser­vice

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