Looks like Blooming pixels to me. You get too much light on a portion of the sensor and it can "Bloom" across the sensor. It's kind of like flair except it's on the digital sensor instead of across lens elements. It also tends to be in the shape of the area that caused the bloom.
I'm guessing that this is a cropped section of the total file, look around the full photo for a bright spot that has that little notch looking thing in it.
|