That big blob Baz, is, believe it or not, a tiny, tiny piece of dust or similar spec on the filter window of the camera. Its just that big due to the distance the shadow is cast.
Problem is it may have been clean at the time of testing, but shipping causes many bumps, etc. This can dislodge a speck from somewhere else to fall on somewhere where a shadow is caused on the sensor.
Even camera lenses get dust in between them.
Theo
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