The weak point of most DSLRs is autofocus at distance. The autofocus system itself often lacks precision (scientific sense), and the lens can contribute by offering less than ideal optical performance and/or a lens motor not up to highly precise operation. Not so with the Sigma 135mm f/1.8 DG HSM Art or so it seems—I wanted to find out if I could rely on DSLR autofocus with the Sigma.
Includes images up to full resolution, with crops. The images also serve to document the optical quality possible with the Sigma 135mm f/1.8 DG HSM Art wide open at f/1.8.