Sigma has unveiled a number of firmware updates for its lenses and adapters to improve features and address various issues.

Specifically, Sigma has published firmware updates for its 45mm F2.8 DG DN for Sony E-mount, 100–400mm F5–6.3 DG OS HSM for Canon EF-mount, some of its Sigma SA-mount lenses and its MC-11 SA-E/EF-E mount converter.

The Sigma 45mm F2.8 DG DN for Sony E-mount has received firmware version ’02,’ that Sigma says corrects an issue wherein blur can occur when using the lens with Sony’s in-body image stabilization. You can download firmware version ’02’ for macOS and Windows computers on Sigma’s support page.

The Sigma 100–400mm F5–6.3 DG OS HSM for Canon EF-mount has received firmware version ‘2.06,’ which ‘[optimizes] the operation of Mode 2 in Optical Stabilizer when used in combination with the SIGMA MOUNT CONVERTER MC-21 EF-L.’ It’s not a major update, particularly if you don’t use the MC-21 adapter, but even if you aren’t experiencing the issue, it’s still a good practice to keep your firmware fresh. The updated firmware is available within Sigma’s Optimization Pro program, which works alongside its USB Dock to upgrade the in-lens firmware.

Our initial hands-on with Sigma's 100-400mm F5-6.3 lens back in 2017.

Sigma has also released firmware updates for a number of its SA-mount lenses. The Sigma 85mm F1.4 DG HSM now has ‘reduced the aperture drive noise’ when used with the MC-21 SA-L adatper, while the Sigma 14–24mm F2.8 DG HSM has improved autofocus when used with the MC-21 SA-L adapter.

Both the Sigma 100–400mm F5–6.3 DG OS HSM and 500mm F4 DG OS HSM lenses for Sigma SA-mount have also received an update that optimizes ‘the operation of Mode 2 in Optical Stabilizer’ when used with the MC-21 SA-L adapter. All of these updates can be downloaded through Sigma’s Optimization Pro program, which is available for macOS and Windows computers.

Lastly, Sigma has released a firmware update for its MC-11 SA-E and EF-E converters. The updates, which can be installed via Sigma’s Optimization Pro program, adds support for the aforementioned lenses in their respective mounts.