I was out tonight taking some nightshots and every streetlight that made its way into a photo had a 14 point starburst around it....what would cause this? better still, is there a way to avoid it? It is kind of humid here, but no visible fog. Pictures were taken at 5 sec. f/22 In the pictures I got it adds to to the feel, but in some situations it may not be desireable...help please!