In case you missed it during the Christmas rush, Sony has posted a firmware update for the A900 and A850 full-frame dSLRs.
Sony claims Version 2.0 of the firmware increase auto-focus speed (varying by lens), adds an improved bracket setting that offers Exposure Variation of 3.0 (opposed the the 2 EV provided by version 1.0 firmware) and expands exposure compensation range to plus or minus 5 EV.
In all, it seems like its well worth upgrading the firmware. A850
US shooters can obtain the 2.0 firmware by going to the Sony Alpha support site then searching for their specific camera model and computer operating system. Although both the A900 and A850 can be upgraded to 2.0, you need to download the proper updater for your specific camera model.
In Europe, Sony A900 and A850 shooters can obtain the update at the Sony Europe site.
Sony advises users to match the upgrade to their particular model and geographic location. What would happen if you applied a A900 firmware upgrade to an A850 or installed the US version on a European camera? Maybe nothing, or maybe the installer would refuse to make the upgrade. Considering that a faulty firmware upgrade could potentially render your camera unusable, you need to follow Sony’s instructions and make sure the upgrade you install matches your camera.
It is nice to see that Sony is continuing to support their high-end flasgship models.