Ultra wide angle lens, f2.8 (with focus chip) for full frame or crop sensor Canon cameras. This lens is manual focus but aperture and exposure are controlled by the camera like any other lens. When focus is achieved (manually) the camera will beep and the focus point flashes if your Canon camera is set to do so. Great lens for photographing landscapes, architecture, night time sky and stars etc. Excellent condition, no scratches, dust or fungus. Like new. REDUCED PRICE!