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
— — — —
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.