Haida Bluestone Shock-Proof UV Filter.

Features:

• 3.1mm ultra-slim aluminium filter frame with knurled edge for optimum grip
• Precision-engineered filter thread
• Schott B270 optical glass
• 12-layer NanoPro multi-coating on both sides of the glass for optimum protection against water, dirt and fingerprints
• Light transmission up to 99.4%
• Shock-Proof construction to protect the front lens element from impacts and shocks