Quote Originally Posted by mikishots
Happens in film cameras as well, using a UV or Skylight filter at night with strong highlights. I've seen it enough to not use filters at night, regardless of type. The only one that doesn't seem to do it is my Rodenstock.

That may well be it. I was using a UV filter on the Canon lens, but NOT on the other lens, which did not produce the odd reflection. I plan on returning to the place to re-shoot and test these theories out, but the sign has some missing neon, so I want to wait until it's returned to it's original glory.

Thanks!