I have taken a few pictures that show these circles, and I'm getting very annoyed at this problem. Seems most common on sunny days. This particular picture is not my own, but it is a good example of what I'm talking about. I can understand certain situations where I could use this to my advantage, but I am wondering right now, is there any way to reverse or prevent this effect?
P.S. As I said before, I have realised that I can sometimes use this to my advantage. In that respect, does anyone know how I can create this effect?
P.P.S Does this effect in any way damage my camera sensor? I know that pointing my camera directly at the sun can hurt it, but will this do any harm?