中文翻译与英英解释

【摄影】光圈。

iris:    n. (pl. -es; irides ) 1.【解剖学 ...

diaphragm:    n. 1.膈膜，膜。 2.【物理学】光圈，光阑。 3.【 ...

diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening
同义词：iris,

例句与用法

The condenser is equipped with an iris diaphragm , a shutter controlled by a lever which is used to regulate the amount of light entering the lens system
聚光镜装配有瞳孔膜，那是一个有贡杆控制的快门，用来调节进入镜头系统的光量。