Absorbing UV : JJC ultra-thin MC UV is made of quality optical glass, and light transmission is up to approximately 98%. It is mainly used for absorbing UV light, which often makes outdoor photographs hazy and indistinct. Precision milled aluminum frame : The filter frame has a matte finish on the surface. It is complied with the ROHS standard that is limited by European Union. The front of the frame is designed with thread for attaching lens cap or other accessories. Aviation aluminum : Frame of the ultra-thin MC UV filter is made of aviation aluminum material. The frame is ultra-thin and corrosion-resistant and has extremely high stability. AGC ultra clear glass : JJC filter is crated from AGC ultra clear optical glass. AGC optical glass meets the strict requirements of quality optical glass, which ensures a high light transmission and greater contrast and color fidelity. Ultra-thin design : 1mm-thick glass makes the filter lightweight and ideal for use with wide angle lenses in order to prevent vignetting Multi-coated design : Multi-coating helps to reduce flare, ghosting, and reflections on the filter surface, providing you with a much clearer image.