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- imaging focal length 成像焦距
- A typical lens has a focal length(f)of 625 mm. 常见镜头的焦距（f）为625毫米。
- Determine the focal length of your lens. 决定你镜头的焦距。
- C: Can I control the focal length? 我能控制焦距吗?
- What is the best focal length for bird photography? 拍摄鸟儿最适合的焦距长度是多少?
- 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 focal length is set to Flat stitch in the Properties window. 焦距在特性窗囗中被设定成平坦的一针。
- It analyzes the design characteristic of CCD and points out the problem in computing the focal length with the optic imaging formula. 分析数码相机CCD的设计特点，指出其在使用光学成像公式计算焦距时遇到的问题。
- The influence of the focal length variation of the collimating lens and the imaging lens on the magnification was analyzed respectively. 系统中视力板移动检测时，准直透镜焦距影响视觉放大率变化快慢，决定视觉放大率曲线的平缓程度；
- This photogragh is shot by lens with a long focal length. 这张照片是用长镜头拍摄的。
- 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。
- The second property concerns the brightness of a projected image, which depends on the focal length and facial, or surface, area of the imaging mirror. 第二项考虑的特性是投影的明亮度，这要视焦距与镜面（镜子的表面）而定。
- Focal length The distance between the centre of a lens and its principal focus. 镜头中心与其主焦点的距离。
- The solid tunable focal length microlens in our study is still a prototype. 本研究所提出之固态调焦透镜兼具微小化、积体化、可单一或阵列使用、及系统整合性高等优点。
- Imaging quality of a single mirror and two mirrors in the case of grazing incidence is discussed.The focal length, field obliquity and diaphragm position of KBA microscope are analyzed. 详细分析掠入射情况下单镜及双反射镜的成像特性，对组成KBA显微镜的反射镜在掠入射条件下的焦距、视场倾斜、光阑位置等进行研究。
- Here the combinations of Testcharts and measuring objectives for different focal length ranges are preset. 在这里预置不同焦距范围的测量物镜与测试图表之间的组合。
- Spot diameters of just a few thousands of an inch can readily be attained with convenient short focal length lenses. 用普通的短焦距透镜不难得到直径只有几十微米的光点。
- As a result, the focal lengths in these planes will be different. 结果，这两个平面内的焦距将不同。
- 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。
- 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
