Early in the life of my new camera my husband had the foresight to gift me with a polarizing filter. In spite of his patient explanations, for months I could not understand for the life of me what it was supposed to do. But last week I read a blog entry on polarizing filters at Digital Photography School on the subject and finally had my "eureka" moment. Finally aware of what I was looking for, I immediately set out to try it. It's amazing!