The Alpha II MC Protector filter is a solid multi-purpose filter that can be left on the lens at all times for protection. The filter offers 93.7% light transmission. The Alpha II is an update to the popular entry-level Alpha I filter for those starting out their photography education. A thinner frame design, improved glass and six layers of multi-coating are featured in the Alpha II series. The Alpha series saves you money by removing premium features like UV protection, optical glass, and hardened, waterproof top layers.