Duncan no the marks are not in the same place and as you can see from the attached are not present at all when shot with the lens cap on so I think it must be like rob says and it is the light refracting somehow.
Interestingly on the other shot and this is something i have also noticed. There are small grey smudges on the photo. Not sure if i did this test right. I shot it at f13 2 stops overexposed up at the sky.
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