The night of the winter solstice eclipse started out with fog - not so dense as to cover the moon completely, but enough to create an interesting halo effect. I was messing around with different settings and went inside to download (and warm up - it was very cold) and discovered that not only were my settings wrong - no definition on the moon because it was too bright, but that I had somehow managed what appears to be a smaller ghost image. I don't know how or why that happened. This image is not cropped from the original, but has levels and color balance adjusted.
Very nice, just because of the ghost image. That's a reflection inside the lens, so it's at a much lower exposure level. Some lenses do that if pointed into a light source that is very bright relative to the background.
A UV filter can cause some ghosting with digital cameras by bouncing the light back and forth between the flat surfaces of the UV filter and the filter over the sensor. Most of the newer lenses and filters have coatings to help prevent this effect. I have a few older lenses that do this, esp when shooting at night and wide apertures.
In any case it worked for this shot to make it more interesting.
there'd be a perfectly logical/understandable explanation .. i dont know what it'd be .. but what a fantastic thing .. two for the price of one .. one so bright and out there and the other pale and ghostly .. love the deep purple tones ... :)