LensCoat® for the Sigma 70-200mm f/2.8 DG OS HSM sports LensCoat® Sigma 70-200mm f/2.8 DG OS HSM sports 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. The LensCoat also acts as a thermal barrier making the lens more comfortable to handle in both hot and cold temperatures. Sigma 70-200 2.8 features a clear plastic windows over the auto focus controls and also the distance scale.