A corona over Kuopio, Finland, around 1990. The cloud in the picture is very thin altocumulus, though it looks a lot like cirrocumulus. This photo is taken in summer, but I'm not quite sure which one. The corona was even better-looking with the naked eye. It had partial third ring, but in this picture only the second one is faintly visible. Unfortunately, the film I had wasn't good for coronas (I've heard Fuji would be, in case you're interested).

(© Timo Nousiainen)