Have you ever wished that your lens could focus closer, a lot closer? The Cokin Close-up lenses work by adding a simple lens in front of your lens that allows it to focus much closer than normal. They are the simplest and least expensive entry into the world of close-up photography. They are available in different "powers" (diopters). A +1 close-up lens will allow you to focus your lens closer than it already does. A +2 will focus even closer and a +3 close-up lens is the strongest and will allow you to focus much closer than the +1 or +2. How close it will focus depends on the focal length of your lens and the actual close focusing capability of that particular lens.