Fine Technology: Adopting double sided multi layer nano coating technology, the lens has waterproof, oil proof, dirt proof and scratch proof properties. ND Filter: Able to prevent overexposure, resist scattered light, reduce shutter speed, increase color saturation to make the picture more gorgeous, achieving advanced effect, and bringing more creation possibilities for photography creation. The number after ND represents the dimming ability. CPL Filter: CPL filters, generally used in landscape photography, eliminate unnecessary polarized light, reflective non metallic surfaces, increase color concentration, make the whole picture more harmonious, comfortable. Easy to Carry: Small size, easy to carry, also come with storage box, can be put in the pocket, backpack for convenient carrying. Powerful Tool: Made of optical glass with high definition grinding processing for high light transmittance, also has coating light reduction process, almost has no color offset.