Lens Coat for the Canon 300 f/2.8 with is II. Lens Coat 300 II telephoto lens cover offers your valuable equipment some protection from scrapes and bumps, preserving its resale value. It also help break up the shape of your lens, making it less noticeable to wildlife. The Lens Coat 300 II features a clear plastic Windows over the auto focus and image stabilization controls, and also the distance scale. A small notch on the last segment lines up with the red dot indicator, making it easy to quickly line up your lens with camera mount even with the cover installed.