Sigma 20mm f/1.4 DG HS M I A £630/$900

This Sigma goes ex­tra-wide in ev­ery way

NPhoto - - Gear Zone -

A world first for SLR lenses, this Sigma Art lens com­bines an ul­tra-wide view­ing an­gle with a wide aper­ture rat­ing of f/1.4. This is made pos­si­ble by a highly com­plex, large-di­am­e­ter dou­ble as­pher­i­cal el­e­ment, which is a chal­lenge to man­u­fac­ture.

Con­sid­er­ing this, the pur­chase price is very rea­son­able, but you do pay for it in size and weight. It’s the big­gest lens in the group by quite a mar­gin and, at 950g, nearly three times the weight of the Nikon 20mm f/1.8 lens.

Like the Samyang 14mm lens, the Sigma 20mm has a built-in lens hood that pro­tects the bul­bous front el­e­ment from phys­i­cal knocks, as well as help­ing to re­duce ghost­ing and flare. Again, fit­ting fil­ters isn’t straight­for­ward, but Lee Fil­ters makes an adap­tor for both lenses, to en­able use of its SW150 Mk II fil­ter sys­tem. Per­for­mance Given the ex­treme view­ing an­gle, im­age qual­ity is ex­cel­lent, with su­perb sharp­ness right into the cor­ners of the frame, neg­li­gi­ble colour fring­ing and fairly mod­est vi­gnetting de­spite the fast f/1.4 aper­ture rat­ing.

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