LensCoat for the Sigma 150-500. LensCoat Sigma 150-500 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 LensCoat Sigma 150-500 features a clear plastic windows over the auto focus controls and also the distance scale. Please note that the LensCoat Sigma 150-500 cannot cover the fixed portion of the lens barrel due to the manner in which the lens barrel extends/retracts leaving approximately 2 inches exposed when the lens is fully extended.