LensCoatA(R) for the Sigma 150-600mm f/5-6.3 DG OS HSM Lens Sports LensCoatA(R) Sigma 150-600mm f/5-6.3 DG OS HSM Sports telephoto lens cover offers your valuable equipment some protection from scrapes and bumps, preserving its resale value. It also helps break up the shape of your lens, making it less noticeable to wildlife. The LensCoatA(R) Sigma 150-600mm f/5-6.3 DG OS HSM Sports Lens cover features a clear plastic windows over the auto focus / stabilization controls and also the distance scale. *This cover comes with an optional piece for the lens is zoomed out to 600mm which can be quickly and easily put on and removed with its Velcro attachment as seen in the picture.