B+W filters are constructed from high quality Schott glass for increased optical clarity and color fidelity. They feature a brass filter ring for durability as well as jamming prevention. This filter is vacuum coated with 1 layer of anti-reflection coating per side to help prevent internal ghosting and reflections as well as improve light transmission.
The B+W 52mm Circular Polarizer SC filter helps reduce reflections and glare by filtering out light that has become polarized due to the reflection from a non-metallic surface. A circular polarizer differs from a linear polarizer in how the light is filtered with a linear polarizer, auto focus and expose accuracy is skewed but when a circular polarizer is used it permits these functions.