Take a good look at the sensor by reflecting a bright light off of it. If it's physical, you would probably see it. A magnifying glass helps with doing this. Hopefully it's just a smudge on the uv filter over the sensor, and can be cleaned off. Look on the opposite side from where the problem appears in your photos.
I certainly hope that you haven't done any permanent damage. A lens, esp a wide angle or fisheye, concentrates the sun's rays on a very tiny spot on the sensor, including the infra red rays of heat.
Other forums say that it takes a long or fast lens to cause a burn. I would also try to get a look at the shutter if the sensor looks good. A spot formed by direct sun rays can focus on the shutter and burn it.
Message edited by author 2011-10-10 21:45:42.
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