| This Sigma ultra wide angle lens with large (f/2.8) aperture and an angle of view of 114 degrees. Equipped with SLD lens glasses and aspherical lenses for high image quality: 2 elements of aspherical lenses and 2 elements of SLD glass is being used to compensate aberrations and vignetting. Minimum focusing distance is 18cm (7.1 inch) and a maximum magnification ratio of 1:4.5. The HSM motor provides ultra quiet high-speed autofocusing as well as full-time manual focus override. An inner focus system provides high performance and convenience. The lens also incorporates a built-in lens hood and a gelatin filter holder behind the rear lens element. |
