DavidV - you win. I looked it up and finally found something.
Unless he too caught something and thought it wasn't Click here to enlarge

Click here to enlarge Originally Posted by canonloader Click here to enlarge
Refraction. It can come from moonlight, or any other bright light source when shooting at night. Supposedly, the higher end lenses do not do it. My Tokina 12-24 did it;

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