I purchased a Nikon D7200 (almost identical to 7100) from a guy on Craigslist and he said it had a sensor scratch, after looking at photos of sensor scratches I don't think that is what it has. When taking photos in daylight at low F stop a light spot appears in the photos. I have tried switching lenses with no change, as the f stop gets higher the spot goes away. What is this and other than replacing the sensor is it fixable?
This photo is UNEDITED
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