Product DescriptionThis is a superb telephoto-zoom lens for sports and nature photography with 3 ED glass elements for high resolution and high contrast even at maximum apertures. It maintains fast f/2.8 aperture throughout zoom range. Features: Optics: Sixteen elements in eleven groups. Three of them are of ED glass. Diaphragm: 9-bladed diaphragm with nine conventional straight blades. They make a 9-sided polygon at all apertures, unlike the |