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it would be possible through a software upgrade to add manual focus on the xperia z3?
Not sure exactly what you mean, but you can focus by either tapping on the screen on what you want or by half pressing camera button.
@perico111 Some kind of selective or adaptive focus mode? Well that's in pro mode as you say, like you were using a DSLR. That's not available on Sony, but you can check 3rd party apps.
Xperia X, the new device from Sony, has predictive hybrid autofocus.
@perico111 Anytime. Remember Sony has manual mode, where you can chage ISO sensivity, white balance, scene type etc. You can take great pictures if you set it up correctly.