Close up lenses are designed to be screwed onto the front of your normal camera lens in order to change the closest focusing distance. The Canon 500D Close-up Lens is a small double-element lens that screws onto the filter threads on a standard (non-macro) lens. Such close-up lenses result in higher magnification when used with longer telephoto lens. In essence they allow you to get close up to your subject matter and are ideal for macro-photography. It allows your normal lens to be focused at a much closer distance- resulting in a higher magnification of the subject. The Canon 500D Close-up Lens is intended to be used on lenses with a focal length of ...  Read the complete review