| 摘要 |
A zoom lens is formed of a fixed cylinder, an outer movable cylinder, an inner movable cylinder, and a guide plate disposed between the fixed cylinder and the outer movable cylinder. The outer movable cylinder is movably fitted into the fixed cylinder and is provided at one end thereof with a first locating point, a second locating point, and a third locating point. The guide plate displaces along with the outer movable cylinder and has a reference portion, which is aligned with the first locating point, the second locating point, and the third locating point to determine the focal position of the lens.
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