Sigma 24-105mm f/4 DG OS HS M | A £600/$900
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Sigma’s Art lenses tend to have extra-wide apertures, for enabling a tight depth of field. In this case, however, Sigma has gone for an extended zoom range at the expense of a drop in aperture rating from f/2.8 to f/4. Size and weight remain manageable but, at 885g, the Sigma is noticeably heavier than the competing Nikon 24-120mm lens, which has an even bigger zoom range.
In terms of build quality and handling, this lens feels like a step up from Sigma’s DX-format lenses and, like other FX-format lenses in the group, this one features ring-type ultrasonic autofocus. Two FLD (Fluoritegrade Low Dispersion) and two SLD (Special Low Dispersion) elements are included, but there are no weather seals.
Considering the generous zoom range of this lens, image quality is impressive: there’s plenty of contrast and centre-sharpness, even when shooting wide-open at f/4. The Sigma also beats both of the competing Nikon FX-format lenses when it comes to minimizing lens distortion.