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. Improved Glass from Alpha I 95.7% Light Transmission Thinner frame design 6 layers Hoya Multi-Coating (HMC) Filter at a Glance Filter Factor: 1/2 stop Glass Type: Hoya Standard Light Transmission: N/A Number of Multi-Coatings: 6 Nano-Coating Technology No Hardened Top Layer: No Anti-Static No Black Rimmed Glass No Frame Construction Standard Profile / Aluminum Front Filter Threads Yes