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Could you elaborate?
you could try this,
open the camera take a screenshot
then take the picture, compare them
btw are the photos taken on low light?
You could upload them to box or dropbox and post the links here
That doesn't seem ok, you should contact your local Xperia Care
http://support.sonymobile.com/global-en/contactUs/
you could also try, settings > apps > all > camera > clear data > restart your phone