Sigma Art lenses named “incompatible” with Nikon D6 camera named

The list includes seven models of the Art line:

• Sigma 12-24mm F4 DG HSM | Art;
• Sigma 14-24mm F2.8 DG HSM | Art;
• Sigma 14mm F1.8 DG HSM | Art;
• Sigma 28mm F1.4 DG HSM | Art;
• Sigma 40mm F1.4 DG HSM | Art;
• Sigma 85mm F1.4 DG HSM | Art;
• Sigma 105mm F1.4 DG HSM | Art;
• Sigma 135mm F1.8 DG HSM | Art.

If any of these lenses are mounted on a Nikon D6 camera, the camera will turn on with a delay and the autofocus function will not work. 

Now Sigma experts are trying to understand why this is happening. The company promises to inform users as soon as a solution is found that eliminates the incompatibility.