"Class: Sports Typical Photography: Travel, Nature and Wildlife, Sports and Action. Designed and executed for the most demanding types of photography, the Sigma 150-600mm 5-6.3 DG HSM OS Sports lens is the new standard for telephoto zooms. Boasting 2 FLD glass elements (performance equal to fluorite) and 3 SLD glass elements, the new Sigma 150-600mm Sport produces incredibly sharp images through the entire zoom range. Chromatic aberration is controlled at the long end of the focal length through the optimized design of the glass elements and a dust and splash proof construction ensures a high degree of durability. High action-capture performance Dust and splash-proof construction Water and oil repellent coating on the front and rear glass elements Customization and flexible adjustment with Sigma USB Dock Soft cap, Lens hood LH1164-01, case included 105mm Filter Size An updated optical stabilizer (OS) features an accelerometer for improved panning photography both horizontally and vertically, essential for birding, wildlife and motorsports photography. The Sigma 150-600 Sports also touts a new zoom lock switch that can be locked at any focal length and a new manual override (MO) switch is incorporated as an option which is activated by rotating the focus ring while using the autofocus. This state-of-the-art lens is equipped with advanced Sigma technology including an optimized, quieter AF, water/oil repellent coati|High action-capture performance|Dust and splash-proof construction|Water and oil repellent coating on the front and rear glass elements|Customization and flexible adjustment with Sigma USB Dock|105mm Filter Size"