My iPhone 4S camera doesn't focus as well as it used to?

When i got my 4S it took amazing photos. It focused beautifully. I've had it for almost a year now (yes, I have a year warranty on it with Telus)… And it really HARDLY focuses anymore. It takes okay pictures, but they're really not like they used to be. It does this thing where you can tell it's trying to focus, then it just gets blurrier. Has anyone else had this problem? Would it be covered in my warranty, if not could I send it in to Apple to get it replaced? I don't live anywhere near an apple store, so I can't just bring it in…

Added (1). Here are a couple of photos to show you the difference.
1 Year ago: http://imm.io/HNCS
Today: http://imm.io/HNCH

These were taken with the same iPhone 4s.

Added (2). By the way, there was no photoshop or filters on the first photo. They are different cats.

Take it to your local Telus store before the year is up. They will send it for free warranty repair.

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