| 摘要 |
An improved lens focusing position adjusting mechanism in which the focusing position is adjusted by changing the relative coupling position, in a circumferential direction, of a focusing ring and a drive ring fitted in the focusing lens and moved together with the focusing lens to drive a lens system. A circumferential groove is formed in the engaging surface of the drive ring or focusing ring, an adjustment belt is inserted in the groove, and the adjusting belt is positioned with respect to the focusing ring and tightened to the outer wall of the drive ring to combine the drive ring and the focusing ring into a single unit.
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