Sigma has announced that three of its lenses, the 20mm F1.4 DG HSM Art, 35mm F1.4 DG HSM Art and the 85mm F1.4 EX DG HSM, aren’t 'fully compatible with' Canon’s newly released EOS-1D X Mark II. When one of these lenses is used with the camera, the resulting images may be underexposed. The company is developing firmware to correct the issue.

According to Sigma, the issue manifests when users choose ‘Center-weighted Average Metering’ or ‘Evaluative Metering.’ In addition, the company recommends users disable lens correction settings in the camera when using one of Sigma’s interchangeable lenses. This includes Chromatic aberration correction, Peripheral illumination correction, Distortion correction and Diffraction correction.

The latter point likely refers to an issue with the 35mm F1.4 Art lens and 1DX Mk II that surfaced last month in which images taken with the pair showed unusual banding around the edges. As SLR Lounge noted, turning off Peripheral illumination correction in-camera fixed the issue, which now appears to be Sigma's official workaround. The camera maker also says that the Manual Override focus function isn’t available with the 1D X II when using its lenses.

Via: Sigma