Focus won't work on iPhone 4s?

Recently the back camera on my iPhone 4s won't focus at all when i get to close to an object like it used to when i first got it. It just turns into a blur when i put it to close to the object. But if i back it up a few inches it works just fine. How can i fix this?

Turn all your modes off, and if it is lets say 1cm away, then it won't focus unless you turn on macro.

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