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Sigma is to provide a free firmware update for Nikon Df owners using Sigma lenses.
"We have found that the current firmware of our Nikon fitting interchangeable lenses may not work properly with the Nikon Df camera's OS and Auto Focus functions." Sigma stated.
The issue effects lenses that don't have an internal AF filter, as well as those that do. The affected lenses are as follows:
- 8mm F3.5 EX DG Circular Fisheye
- 15mm F2.8 EX DG Diagonal Fisheye
- 20mm F1.8 EX DG Aspherical RF
- 24mm F1.8 EX DG Aspherical Macro
- 28mm F1.8 EX DG Aspherical Macro
- Macro 50mm F2.8 EX DG
- Macro 70mm F2.8 EX DG
For more information, take a look at the Sigma website.