| 释义 |
〔diaphragm〕A disk having a fixed or variable opening used to restrict the amount of light traversing a lens or optical system.光圈：具有固定或可变孔的圆盘，用来限制穿过透镜或光学系统的光量〔luminosity〕The ratio of luminous flux at a specific wavelength to the radiant flux at the same wavelength. Also called In this sense, also called luminosity factor 发光效率：一定波长的光量对同样波长的辐射光量的比例 也作 在此意义上也可称作 luminosity factor |