Coating : This PROII CPL-VND 2 in 1 Filter is constructed from optical glass for clarity as well as color fidelity. To prevent internal ghosting and reflections, the glass features eight layers of multi-coating. These coatings also offer greater protection to a filter substrate and help it to stay clean for longer than with uncoated filters.
Frame : Ultra slim aluminum alloy ring ensures durability while allowing the filter to remain lightweight. The thin, aluminum-alloy filter ring minimizes the potential for vignetting, while remaining durable and lightweight.