Freewell UV Filter only compatible with The Real Locking L1 VND/CPL

REDUCE UV LIGHT - Blocks harmful UV light, reducing haze and improving clarity, especially in bright conditions or at high altitudes with increased UV exposure. UNIQUE LOCKING MECHANISM - The UV filter features an easy-to-use locking system. Simply press the tabs to lock them securely in place, preventing them from shifting or loosening during use. Protection: Use the UV filter only for the protection of the lens on the base ring.