传统的凸轮调焦机构和丝杆丝母调焦机构存在结构复杂；加工、装调难度大；
The traditional focusing mechanism has several disadvantages, such as complex structure, difficult alignment, slow response, poor positioning accuracy, etc.
传统的凸轮调焦机构和丝杆丝母调焦机构存在结构复杂；加工、装调难度大；
The traditional focusing mechanism has several disadvantages, such as complex structure, difficult alignment, slow response, poor positioning accuracy, etc.
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