The Olympus 58mm Protective Filter fits the M.Zuiko Digital ED 14-150mm f4.0-5.6, the M.Zuiko Digital ED 40-150mm f4.0-5.6 and the M.Zuiko Digital ED 75-300mm f4.8-6.7 lenses. It is the standard Protection filter most people are familiar with. It can help protect your valuable investment from dust, moisture and scratches, which can lead to costly repairs. A Protective filter is probably the most popular filter people use. As a lens protector, it should be left on at all times to guard against front element damage but also adds the benefit of rendering your images clearer.