Thank you for purchasing and using our products.

We would like to announce the availability of new firmware and support for the applicable lenses regarding
the phenomenon that exposure of the image may not be accurate, which was announced on May 27th, 2016.
This happens when some SIGMA interchangeable lenses for CANON are used on Canon EOS 1DX Mark II.

If you own the following applicable products, please refer to the information below and update the lens
firmware accordingly.

[Benefit of this firmware update]
The lens firmware update corrects the phenomenon of some underexposure when the lenses listed below are
used and either “Evaluative Metering” or “Center-weighted Average Metering” is selected in Metering
Mode of the camera.

[Applicable products]
SIGMA 20mm F1.4 DG HSM | Art – Canon mount
SIGMA 35mm F1.4 DG HSM | Art – Canon mount
SIGMA 85mm F1.4 EX DG HSM – Canon mount

For customers who own the SIGMA USB DOCK, and either the SIGMA 20mm F1.4 DG HSM | Art Canon or the
SIGMA 35mm F1.4 DG HSM | Art Canon, please update the lens firmware using SIGMA Optimization Pro.

For customers who do not own the SIGMA USB DOCK or are owners of the SIGMA 85mm F1.4 EX DG HSM, the lens firmware update will be provided free of charge but you will need to provide the proper documentation as listed in the instructions on the Service & Support section of our website. Please use the following link or contact our Service Department for advice. Telephone: 01707 329 999 / Email: service@sigmauk.com 

Repairs & Support Section: How to return a product 

We appreciate your continued support for our company and products.