Focal length is the important optical parameter of optical lens. It is valuable that methods based on Talbot effect and Moire technique are applied for measuring the long focal of lens.
焦距是透镜最重要的光学参数，应用泰伯—莫尔法测量长焦距透镜焦距具有重要的实践价值。
Focal length is the important optical parameter of optical lens. It is valuable that methods based on Talbot effect and Moire technique are applied for measuring the long focal of lens.
焦距是透镜最重要的光学参数，应用泰伯—莫尔法测量长焦距透镜焦距具有重要的实践价值。
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