New Sony A6600 firmware update adds support for the LA-EA5 A-Mount Adapter

It’s available here: sony.co.uk/electronics/support/downloads/00016897

Benefits and Improvements

• Adds support for the LA-EA5 A-Mount Adapter (sold separately)
  • LA-EA5 A-Mount Adapter supports all A-mount lenses
  • Full support is provided for focal plane phase-detection AF, and the AF and high-speed continuous shooting features
  • Wide-area focal plane phase-detection AF coverage
  • AF features based on subject recognition, including Real-time Eye AF (human, animal) and Real-time Tracking
  • AF/AE tracking during continuous shooting at up to 11fps

  Notes:

  • STF lenses are manual focus only
  • Teleconverters are not supported for use with any A-Mount Adapters
  • Autofocus is not available during movie recording when using the LA-EA5 A-Mount Adapter
  • For AE tracking, the aperture is fixed for the first frame while shutter speed and ISO are used for exposure adjustment
• Improves the overall stability of the camera

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And Sigma issued this warning today:

The focus may not work on α7R III / α7R IV depending on the shooting distance when the focus mode is set to ‘AF-C’ with an aperture value of F1.2. We are planning a firmware update to address this issue, which will be announced in due course.