| 2. | The aspheric optical element has many merits , for example , correcting optical aberrations , improving image quality , extending range of action , simplifying system organization , reducing the cost and reducing weight 现代光学系统中大量采用非球面镜以矫正像差、改善像质、扩大视场、增大作用距离、简化光学系统结构、降低成本、减轻重量。 |