Sony is not making a single attempt to make non native lenses focus on their cameras, they want you to buy the native lenses. Third parties are the ones making retrofit adapters and unfortunately they don't have huge funds like Sony and Canon to put in the R&D.
Supposedly this camera focuses 30% better with the native lenses, not sure if that's for accuracy or speed.
Yet Sony bodies can AF non-native lenses using adapters, and Sony has also patented Z-axis sensor movements for focusing by moving the sensor and for flange distance adjustments, which would be only useful for non-native sensors.
Sony is late to the party - almost everyone who will ever have a large collection of glass already has a large collection of either Canon-mount or Nikon-mount glass. Also, a lot of Sigma, Zeiss, Tamron and other useful third-party lenses aren't available in Sony A-mount or E-mount. It would be exceedingly difficult for them to get people to sell their collection and switch to Sony (losing thousands of dollars in the process) even if they were to bring out a new, comprehensive and optically-excellent lens collection.




