Adopt double-sided multilayer nano-coating technology to give the lens oil-proof and scratch-proof performances. Can elimanate reflection, increase saturation, enhances contrast, making the pictures more three-dimensional and transparent, overexposure. Pasted the installation base, stable, no-glue, no need to disassemble and replace the filter which is and quick. The frame is aviation aluminum, which has strong resistances and is not easy to fade. Optical glass, precisions grinding and polishing, visible light transmission rate of 96%, high-definition imaging.