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- 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
- Further study on thin-lens focal length measurement experiment 对薄透镜焦距测定实验的进一步研究
- Research on focal length measurement based on digital image processing 基于数字图像处理方法的焦距测量技术研究
- Scanning Method for Focal Length Measurement of Large Aperture Long Focal Mirror and Lens 大口径长焦距镜面和透镜的扫描法焦距测量技术
- Focal length measurement by calculating Fourier transform spectrum interference fringes of symmetric double circular apertures 对称双圆孔傅里叶变换干涉条纹法测焦距
- 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
- 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?
- focal length measurement 焦距测量
- An amount or length measured in yards. 按码测量的数量或长度
- 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。
- He had a12-foot length measured off from a piece of oak. 他让人从这块像树上锯下12英尺长的木块。
- Objective and the focal length of the specimen to be measured. The measurement of the size of the reticle. 十字线的像的尺寸取决于准直仪物镜的焦距和待测样品的焦距。
- This photogragh is shot by lens with a long focal length. 这张照片是用长镜头拍摄的。
- The Measurement of Long Focal Length Based on Talbot Effect of Ronchi Grating[J]. 引用该论文 侯昌伦;白剑;侯西云;杨国光.
- 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 The distance between the centre of a lens and its principal focus. 镜头中心与其主焦点的距离。
