The helical groove machined on the focusing ring on the turning center
车削中心加工调焦筒螺旋槽
While looking through the viewfinder, focus by turning the focusing ring.
观察取景器同时转动光圈环进行对焦。
The second version also has wider and deeper knurling on the focusing ring than the previous version.
第二版调焦环上的棱比前一版更宽更深。
Support the camera on the palm of your left hand so that you can turn the focusing ring with your fingers.
请把相机置于您左手掌上，便于您能用手指旋转对焦环。
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