一旦装上它后，只要将镜头转到普通的最近对焦距离处，就可获得更近的对焦。
When focused near it's closest regular focusing distance, the lens will be difficult to mount OR unmount.
一旦装上它后，只要将镜头转到普通的最近对焦距离处，就可获得更近的对焦。
Once mounted, the closer focusing range is attained by turning the lens to it's closest normal focusing point.
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