THEN pull the focusing barrel out slightly, and the lens barrel can be swung over farther to the left, to get into the close focusing range.
然后轻轻将镜头的调焦筒拉出，镜筒就可以继续向左转动以获得更近的对焦距离。
Fourth version 1969-1979 Black lens with no "50" on barrel, no focusing lock or lever.
第四版1969- 1979，黑色镜筒上没有“50”字样，没有对焦锁和把手。
Fifth version 1980-95 Black lens with "50" on barrel, reintroduced focusing lever, without built in hood.
第五版1980- 1995黑色镜，镜筒上刻有“50”字样，重新加上了对焦杆，没有内置遮光罩。
Fifth version 1980-95 Black lens with "50" on barrel, reintroduced focusing lever, without built in hood.
第五版1980- 1995黑色镜，镜筒上刻有“50”字样，重新加上了对焦杆，没有内置遮光罩。
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