Share your experience!
i'm having this tiny problem with my xperia z! whenever i use my camera, there will be a tiny black dot on my screen. at 1st i thought it was some dirt on the lens and tried to clean it. after that only i noticed the black dot was moving with my camera zoom. i tried going into *#*#7378423#*#* to the display testing and there was no black dot on pure white screen. i was told by some fellow forum members that this is the camera's fault. i tried email to sony but i have not receive any news from Sony yet. it has been 2 days already!
yes this is camera (hardware issue) you have to take your phone to sony service centre where sony agent can inspect your phone properly 
or you can take it to phone service if you got it with a subscription contract so they will be able to send it to a licensed repair station that they got contract with
so they will repair it and send it back to you, for free if lucky if yours now got vaild warranty/gurantee 