Sony issued a new firmware update for the Sony A9: https://esupport.sony.com/
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Added functions for professionals engaged in sports/news media:
- Adds the Write Serial Number option (On/Off) to the menu for selecting your preference in writing the serial number to the Exif data
Improvements in auto focus performance and functionality:
- Improves tracking performance of moving subjects in AF-C mode
- Improves auto focus speed in low light
- Adds AF Track Sens as a selectable option for custom key settings
- Adds support for all focus areas when using LA-EA3 mount adaptor
(Focus Area options added: Zone, Expand Flexible Spot, and Lock-on AF)
Improvements in flash control performance and functionality:
- Reduced release time lag when shooting with flash
- Adds support for Slow Sync and Rear Sync when using flash wirelessly
- Adds support for white balance automatic correction when using color filter of external flash (HVL-F60RM)
Other Improvements:
- Stabilized release time lag when shooting in AF-C mode
- Improves overall stability of the camera
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Thanks Bard!