open lens aperture 发散透镜孔径
open aperture
开孔
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Shooting wide open, using aperture f2.8 on most lenses, gives you a shallow depth of field that emphasizes the part of the images you are focused on.
CNN: photojournalists share their tricks
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