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- Determine the focal length of your lens. 决定你镜头的焦距。
- A STUDY ON THE INFLUENCE OF OPTICAL FOCAL LENGTH OF LENS ON LASER FOCAL SPOT 透镜的焦距对激光聚焦焦斑影响的研究
- De Angelis, Marella; De Nicola, Sergio; Ferraro, Pietro,“Analysis of moire fringes for measuring the focal length of lenses,” Optics and Lasers in Engineering, Vol. 30, No. 3-4, p279-286, 1998. 朱志良、李佶峰(2006)，”创新长行程双雷射聚焦读取头光学尺系统之研制”南台科技大学机械工程系硕士论文,民国九十五年。
- The focal length of a given lens is different for different colors. 一个特定的透镜的焦距因颜色的不同而不同。
- The Improvement of Image Plate in the Experiment of Determining the Thin Focal Length of Lens 薄透镜焦距测定实验中像屏的改进
- The focal length of the camera lens plays an important role in photo criteria. 摄影机镜头的焦距在摄影规范中起着重要的作用。
- focal length of lens 透镜焦距
- The focal length of the conelensing lens should be such that the image of the source just fills the projecting lens. 聚光透镜的焦距应使光源的像正好照满放映透镜。
- The ratio of the focal length of a lens or lens system to the effective diameter of its aperture. F值物镜或物镜系统的焦距与入射光孔直径之比
- STUDY ON METHOD OF AUTOMATIC FOCALIZATION TO MEASURE FOCAL LENGTH OF LENS ON LIGHT-UTENSIL SEAT 光具座测量透镜焦距的自动调焦方法研究
- The automatic adjustment in the focal length of the lens of the eye to permit retinal focus of images of objects at varying distances. 眼调节眼睛瞳孔对焦距的自动调节，以获得不同距离的物体在视网膜上的成像
- The Manfrotto 303 also allows the user to set the degree of camera rotation set in relation to the focal length of the lens being used. 曼富图303云台还可允许用户设定相机旋转角度和配套的镜头焦距长度。
- Camera shake rule： The slowest shutter speed at which you can safely handhold a camera is one over the focal length of the lens in use. 手持拍摄时，最低安全快门速度为所用镜头焦距的倒数，低于这一速度，相机震动可能导致照片的锐度下降。
- It is shown that by changing the focal length of focal lens and the distance between the axicon and the lens, the center of dark of the bottle beams can be altered effectively. 这些结果表明，改变聚焦透镜的焦距和聚焦透镜到轴棱锥间的距离以及光阑半径，可有效地改变局域空心光束的暗中空区域。
- A typical lens has a focal length(f)of 625 mm. 常见镜头的焦距（f）为625毫米。
- If the objective lens is closer to the compact disk than the focal length of the object lens, then the cylindrical lens creates an elliptical image on the photodetector array. 如果物镜与光盘之间的距离短于物镜的焦距,柱面透镜就会使在光电探测器阵列上的成像变成椭圆影像。
- A unit of measurement of the refractive power of lenses equal to the reciprocal of the focal length measured in meters. 屈光度透镜或棱镜折光率的一种量度，等于以米计算焦距之倒数
- By assuming the weak lens focal length expression to be the first term in a power series, a simple and accurate formula can be derived for the objective focal length of a magnetic electron lens. 用假设弱透镜焦距表达式是一个幂级数中的第一项的方法,可以导出相当准确且便于实用的电磁电子透镜物镜焦距公式。
- If the objective lens is further away from the compact disk than the focal length of the object lens, then the cylindrical lens again creates an elliptical image on the photodetector array. 如果物镜与光盘之间的距离长于物镜的焦距，柱面透镜也会使在光电探测器阵列上的成像变成椭圆影像。
- In the measurements,the focal lengths of positive and negative lens are determined by the tilt angle, of the Moire fringe. 在测量中，根据莫尔条纹的斜角确定正、负透镜的焦距。
