For startling and precise close-up photos of insects, stamps or pages from a book, you will require ease-of-operation, superior optics and versatility. The 50mm Macro produces a critically sharp picture at any distance between 230mm and infinity without attachments and will provide magnifications up to one-half life-size unaided. To obtain magnifications up to life-size (1:1), use the Life-Size Adapter, which enables you to focus down to 203mm. The lens couples to the TTL metering system, providing full-aperture exposure control. Construction: 6 elements in 4 groups Angle of view: 47 degrees Minimum focus: 9in Aperture range: 3.5 - 22