Dew on your lense?
#3
I have used RainX, Fogx, CatCrap[not a missprint], and regular antifog lens cleaner from the eye doc. All help to a certain extent, but none eliminate the problem. I have the same problem this time of year and have had every year. If someone has found a reliable solution I'm all ears. Luckily it only seems to happen for a few weeks, then no problem again til next year.
#6
If its just in the top part of the picture and kinda rainbowed shaped its the flash bleeding. I have one that did the same thing. Find some small foam and place it between the flash and the lens. Once you open the lid you will see what I'm talking about. Here is what mind was doing before I put the foam in.