I’m us­ing a Sigma 12-24mm f/4.5-5.6 II DG HSM with my Df for land­scape shots, but am get­ting very bad vi­gnetting. Is this nor­mal?

Mike Hall, via email

NPhoto - - Niko Pedia -

Ja­son says… Most ul­tra-wide lenses suf­fer from fairly heavy vi­gnetting, or dark­ened im­age cor­ners, but the Sigma 12-24mm lens is no worse than oth­ers. Even at 12mm, which gives an as­ton­ish­ingly wide view­ing an­gle, you should be able to get good il­lu­mi­na­tion in the cor­ners of the im­age frame so long as you stop down to around f/8 or f/11.

It’s of­ten prefer­able to avoid wide aper­tures in land­scape pho­tog­ra­phy any­way, so that you can ex­tend the depth of field and max­imise sharp­ness across the im­age. In­ci­den­tally, Sigma has just re­leased a new 12-24mm ‘Art’ lens with an f/4 con­stant aper­ture rat­ing. It pro­duces su­perb im­ages with less vi­gnetting and amaz­ingly lit­tle dis­tor­tion, but is phys­i­cally big­ger and heav­ier, and at £1650/$1600, it’s much more ex­pen­sive!

With ul­tra-wide lenses, you may need to stop the lens down to avoid vi­gnetting

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