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i dont know if this is impossible or not, but i really do like if i/we can control the focus effect on the camera (focus on near/far object) becuase auto-focusing does not really not that quite good enough thus ending unfocus at all.. anyways im just curious about this stuff 
Check out the different focus modes. Switch from the auto mode to normal and go to settings.
I agree with jeffbriones, why didn´t you make a two stage autofocus shutter? I think that´s better then what you have now and the autofocus on the xperia z is really unpredictible and gets the focus right about 47% of the time and that´s very low if you ask me.. You guys at Sony can do so much better with the camera. The autofocus needs to be improved alot and as jeff said we would like more control over it..