Sigma 135mm F1.8 DG HSM | Art (SIGMA SA-mount)
firmware v1.01
Sigma · Released Apr 18, 2019 · First seen Jul 5, 2026
v1.01 is the latest firmware for the Sigma 135mm F1.8 DG HSM / Art (SIGMA SA-mount), released April 18, 2019.
In short — summary by updatemystuff.com
Fixed overexposure anomaly at smaller apertures and enhanced autofocus performance with the MC-21 mount converter.
- Corrected occasional overexposure when stopping down from F3.5
- Improved autofocus speed and quality with MC-21 mount converter
Written from Sigma's release notes, which are printed in full below.
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What's in this update
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.
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