2 sentences for 光圈 (guāng​quān)

1. 月亮周围出现了一个漂亮的光圈。

   yuè​liang zhōu​wéi chū​xiàn le yī gè piào​liang de guāng​quān.

   A beautiful halo appeared around the moon.

   Source: Dong Chinese Dictionary

2. 拍摄人像时，通常会使用大光圈来虚化背景。

   pāi​shè rén​xiàng shí, tōng​cháng huì shǐ​yòng dà guāng​quān lái xū​huà bèi​jǐng.

   When shooting portraits, a large aperture is usually used to blur the background.

   Source: Dong Chinese Dictionary