I have taken a few photographs in the dark, or early morning recently and on a few of them I have found bright circles which are most annoying. In both situations I have not had the Lens flare (1 of 1).jpghood on, partly because I was using filters for some shots and could not be bothered putting the hood back on for those shots without the filters. I am wondering if it looks like flare or could it be something else. Pretty sure it is not sensor dust, too big, but maybe it was something on the . Either way would anyone be able to offer an opinion on what these could be?