It raises the performance bar about 20 years ahead of every other ultra-wideangle SLR lens.
它提高了性能限制是20年之前 ， 所有其他超广角单反镜头。
2
An all-electrostatic focusing and deflecting system characterized by simple lens system is introduced The new system is very useful in producing compact high-performance camera tubes.
介绍了一种采用只含有会聚场的单透镜的全静电聚焦和偏转系统，这种系统非常适用于制作小型高性能摄象管。
3
Design lens or lens optical performance evaluation and assessment.