Sigma 17-40mm F1.8

Expert Opinion

Professional reviewers and Sigma’s own press praise the 17‑40mm for its unprecedented combination of a constant f/1.8 aperture with a zoom design, noting corner‑to‑corner sharpness that rivals prime lenses, robust weather sealing, and a fast, silent HLA autofocus that minimizes focus breathing—features that make it especially attractive for hybrid stills‑and‑video shooters.

What Users Say

Early consumer buzz, though limited due to the recent launch, is enthusiastic about the lens’s lightweight feel, fast aperture for bokeh, and versatile focal range. Potential concerns revolve around its weight relative to ultra‑compact kit lenses and the absence of an aperture ring on the Sony version.