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
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