Features:
* Virtue: offers high resolution image from as far as 300 meters
* Material: PC (optional)
* UV-resistant and vandalproof
* Transmittance: 88 persent (optional)
* Distortion: ≤0.1 percent
* Suface precision: 0.5-1um
* Surface roughness: 1-10nm
* Dispersive index: 1.585l