Bizarre digital photo - how did this happen?

<p>I've sold cameras and equip't., been a photog for 'bout 43yrs., was a lab tech and while it is fun to chase these kinds of incidents for the technical aspect of it, simply the route to have taken was to ask the lens condition, the user's level in understanding "clean", etc. It would have shortened the chain considerably. That is part of the process of elimination which is what has just occurred.</p>