光圈

kě biàn guāng quān

可变光圈

iris

tiáo jié guāng quān

调节光圈

adjust the aperture

wǒ xiàn zài yīng gāi yòng duō dà de guāng quān

我现在应该用多大的光圈？

Which stop should I use now?

zhè zhǒng guāng quān de shuāng tǒng wàng yuǎn jìng shì fēi cháng áng guì de

这种光圈的双筒望远镜是非常昂贵的。

Binoculars of this aperture are very expensive.

huǒ jù de guāng quān

火炬的光圈

the circle of light of the torch