Sigma 17mm F4 DG DN | Contemporary (L-Mount)
firmware v1.2
Sigma · Released May 21, 2026 · First seen Jul 5, 2026
v1.2 is the latest firmware for the Sigma 17mm F4 DG DN / Contemporary (L-Mount), released May 21, 2026.
In short — summary by updatemystuff.com
Release adds focus ring customization and T-stop aperture display for video recording.
- Focus ring functions now assignable during autofocus
- Focus ring rotation direction adjustable for manual focus
- Aperture displayable as T-stops during recording (supported cameras only)
Written from Sigma's release notes, which are printed in full below.
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What's in this update
- Specific functions can now be assigned to the focus ring during AF.
- The rotation direction of the focus ring during MF can now be set.
- Aperture values can now be displayed as T-stops during movie recording.
- Only on supported cameras.
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