I'm newbie, I have a silly question.
I noticed that in some photos, the spot light appears as a spoke, certain numbers of lighting rods radiating from the center, like this http://upload.wikimedia.org/wikipedi...-_Dec_2008.jpg

Is it the result of some kind of filter or something?

How to get different numbers of the lighting rods?

I know it's a beginner's stupid question, but I really don't know and want to know.

Thanks.