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- 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.
- A New Method for Measuring the Veiling Glare Index of Long Focal Length Optical Systems and Theoretic Analysis[J]. 引用该论文 高万荣;薛鸣球;苗兴华;查冠华;沙维敏;潘来俊;张兴珍;梁蕴绵;秦斌.
- In order to rule the concave grating with a long focal length,a cutter frame with elastic thimble mode was designed and manufactured. 对大曲率半径(即长焦距)金属基底凹面光栅的机械刻划技术做了研究。
- Taking photographs of these small deep sky objects require a lens of longer focal length, sometimes a telescope is used instead. 拍摄这些细小的深空天体,必须用较长焦距镜头,甚至要用一支望远镜作为镜头。
- Lightweight Long Focal Length Space Lens 空间小型长焦镜头
- Long focal length with large field ofview 长焦距大视场
- Design of long focal length large-aperture optical zoom system 长焦距大口径连续变焦光学系统的设计
- Dynamic Analysis on Lightweight Long Focal Length Space Lens 空间小型长焦镜头的动力学分析
- DESIGN OF WIDE ANGLE SPACE OPTICAL SYSTEMS OF LONG FOCAL LENGTH 大视场、长焦距空间光学系统的设计
- The optical image stabilization system is very useful to ensure smooth framing when filming at longer focal lengths. 光学图像稳定系统是非常有益的，以确保可顺利诬陷，当拍摄更长的焦距。
- Optical Design for the Off Axis Telescope with Long Focal Length and Wide Field of View 长焦距、大视场、离轴望远系统的光学设计
- 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
- 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?
- Accurate Measurement and Processing of the Angular Deviation of TV tracking System with Long Focal Length and Continuous Zooming 长焦距连续变焦电视跟踪系统角偏差的精确测量与处理
- 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。
