Ultra thin ultraviolet filter with ABS (anti-blocking system) and multi-layer coating. It helps to improve photo quality while protecting the lens from dust and fingerprints. Absorbs UV wavelengths be espandi...low 400 nm and blue light but does not affect image colours. Made of high-quality optical glass, the frame is made of aircraft-grade aluminium and is lightweight and anti-oxidising. Suitable for all types of scenes, it is an indispensable filter.