There are a variety of these. List price 199.00, they often sell for less tan a dollar. Meniscus lens behind a piece of glass. A friend of mine thought he really got a deal when he paid 40.00 for one of these things. He was so proud of it, he couldn't wait to call me to come over and look at his "treasure". I took one look at it, laughed like hell and asked him: "You didn't actually pay money for this thing, did you"? Well, that made him mad, but not as mad as when I showd him one on $bay for 3.00. Never saw that thing again.