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    EF 300mm 2.8 IS - Anybody seen anything like this?

    I rented a 300mm 2.8 IS from a local dealer last weekend for a softball game as my 70-200 was in for repair. There was some kind of issue with the lens as I could not achieve any kind of flat plane of focus. I suspected a mis-aligned or loose lens element. It seemed to get better or worse...