However, I first would inspect the interior of the camera and see if there are any cobwebs (seriously) or any loose debris. Then open the back -- remove it if you want -- put the shutter on B, lock open the shutter with the lens at f/2.8 and shake the camera a bit and see if any debris lands on the lens. Use a flashlight or an open window or any light source that isn't the sun. Close the shutter and repeat several times.
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