The Sigma 135mm F1.8 DG HSM Art is a full-frame telephoto portrait prime for Sigma SA mount featuring 13 elements in 10 groups and a fast F1.8 aperture. It uses HSM autofocus and a 9-blade circular aperture. The lens belongs to Sigma's Global Vision Art line.
Product released: March 16, 2017
Latest firmware version
Version 1.01, released April 18, 2019
What's new in version 1.01
It has corrected the phenomenon whereby it may occasionally show overexposure when narrowing down the aperture from F3.5 while shooting.It has improved the AF speed and quality when the lens is used with the SIGMA MOUNT CONVERTER MC-21 SA-L.