Compatibility issue: Sigma announces that MC-11 mount converter may not focus properly on Sony A9


posted Tuesday, May 30, 2017 at 10:30 AM EDT


With new cameras and technology, there’s always a risk of compatibility issues with third-party lenses and equipment. Unfortunately Sigma has announced that they have discovered an issue with their Sigma Mount Converter MC-11 and the new Sony A9.

When using the Sigma Mount Converter MC-11, either the EF-E to SA-E versions, some of Sigma’s interchangeable zoom lenses may not offer accurate autofocus performance. When using an adapted Sigma zoom lens with the Sony A9 in AF-S mode and focusing on a subject in the telephoto range, the camera may incorrectly show that the lens is focused when it is not.

Sigma MC-11 (EF-E)

Sigma apologizes for the inconvenience and are currently investigating the situation. They will release further information as it becomes available. Readers with the Sony A9 and Sigma MC-11 converter, have you experienced this issue? Sony A9 owners in general, have you experienced any third-party compatibility or performance issues with your brand-new camera? Let us know in the comments below.

(Seen via The Digital Picture)