The Alpha Ii circular polarizer, now updated with a thinner frame and improved glass, is a great entry-level filter for those starting out their photography education. Providing the same level of polarization as other filters, the Alpha series saves you money by removing premium features like multi-coating, optical glass, and hardened, waterproof top layers.Circular polarizing filters give scenic photography more punch by darkening blue skies so that white clouds and foliage stand out. Light rays become polarized when traveling through moisture and pollution in the atmosphere as well as when they reflect off non-metallic surfaces. A polarizing filter absorbs polarized light and helps remove unwanted reflections from non-metallic surfaces such as glass or water. By removing these reflections, this filter also increases color saturation, especially in leaves and foliage..