It is camera bellows operation completely!
完全是暗箱操作！
The rate of top grade field developing by camera bellows was up to 90%, with less poor quality and no waste photos.
暗箱在拍片现场成像优质率达90 %，质差片减少，无废片。
By jury-rigging a microscope with a bellows camera, Bentley was able to capture for the first time the exquisite delicacy of a snowflake.
由于本特利在风箱照相机前加装了一个显微镜头，因此他首次捕获到的雪花图案相当精致。
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