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nvm i know what it is. Is it the protection from the lens?
Hey here's the pic ik low quality but you see a bit. Ill try to do a pic with my z3 tablet later 
Have the same problem. It's obviusly not a protection. The pictures are like in slight blur and camera focuses too long before making a picture.
I think it is dust left after manufacturing inside the phone. There were same issues with z1, z2 xperias.
And after good shaking or falling the dust moves on the camera lens.
Here is the pic
Hi, at anytime recently did you have or notice any condensation on your lens 
No no, it's not a condensation.now here are pics from my z3 tablet
Do you see that at the bottom? and in the middle these things? idk what it is?
@dandy63 wrote:Hi, at anytime recently did you have or notice any condensation on your lens
I didn't. Phone wasn't with contact with water or snow.
During NY holidays have been in mountains, so maybe any pressure or temperature difference caused condensaton.
Anyway im going to apply for warranty repair.