Tamron has issued a statement on the autofocus issues reported by users of its 28-75mm FE for Sony and says it is looking into a solution.
Tamron says that once it discovers the cause of the error it will issue a firmware update for the 28-75mm FE lens.
The issue, as reported by user of the 28-75mm FE lens, occurs in video mode and causes the AF system to freeze.
Tamron’s official statement reads:
Dear Tamron product users and potential purchasers.
Thank you for your interest in Tamron products.
We would like to announce that we discovered some issues with the auto focus of our new lens, 28-75mm F/2.8 Di III RXD (Model A036) for Sony E-mount, 35mm full-frame mirrorless cameras, released on May 24, 2018. The issues occur primarily when using the camera in video recording mode.
Rest assured, we are evaluating the cause of the error and for the solution to this matter. We expect this issue to be resolved very shortly and we will release a firmware update at that time.
Regarding the firmware updating process, please be assured that the process is accomplished directly through the Sony camera and supported by the Sony firmware updating function. As soon as the process is finalized, we will explain the process in detail on our website.
We sincerely apologize to all users and potential purchasers for any inconvenience this issue may cause.