focusing knob
... knurled knob滚花旋钮 focusing knob调焦旋钮 plunger knob柱塞旋钮 ...
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粗调焦旋钮 coarse-focusing knob
精调焦旋钮 fine-focusing knob
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该种摄像机可通过手动旋转旋钮装置调焦而满足不同监视现场对焦距的要求，同时制造成本低。
The video camera in the utility model can be focused by manual through the knob to meet the demand of different monitoring sites and achieves a lower producing cost.
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