The term "Closeup Lens" can also be referred to as a macro lens or a magnifying lens. The purpose of this lens is to enable the photographer to capture fine details of a subject at close range. Another synonym for closeup lens is a diopter lens. A diopter lens is also used for macro photography; however, it is limited to focusing on a specific distance. A closeup filter is another synonym for closeup lens that attaches to the front of a camera lens to enable a closer focusing distance. Lastly, extension tubes can also be used as a synonym for closeup lens, as they move the lens farther away from the film or sensor to focus on a closer range.