Iphone 6 plus camera

my iphone 6 plus is taking reall blurry pictures from the back camera. i Have tried restarting my phone and i cleaned the back camera,and my phone is updated to the newest IOS 9. I also looked into the settings on the camera about the lighting and its not on a filter but if my phone isnt about a foot away from the object im trying to take a picture of its really blurry. What do i do to fix this??