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I have recently noticed an artifact appearing in the bottom center of my pictures. This only happens at smaller apertures F8 - F22. It is not dust as it forms almost a perfect 1/2 ring. I have swapped out lenses so it is not on the lens. I have done the self cleaning, as much as that does. I even looked at the sensor, I figured something this big would be visible, but the sensor appear clean. Given its size and shape I am not sure that a cleaning of the sensor would be helpful I have included 2 pictures. One is a blown up view of the artifact and the other is the full picture. You can see the artifact about 1/3 of the way in from the left and 1/3 of the way up from the bottom. The camera is still under warranty and I was looking for any advice before I have to pack it up and send it away for a few days or weeks depending on the speed Sony's warranty service. I would like any advice on how I should proceed. Thanks