19. One limiting factor is the viewing Angle, which is comparable to using a camera lens: a telephotolens has a narrower view than a wide-angle lens.
限制因素之一就是观察角度，这与使用照相机的情况类似：长焦镜头的视野比广角镜头的观察角度要窄得多。
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20. The eye-in-hand vision system is an important type of robotic vision system. In this paper an inverted-telephoto lens system which serves as eyes of robot is discussed .
手眼视觉系统是一类重要的机器人视觉系统，具体介绍了一个用于机器人手眼视觉系统中的手眼镜的光学设计。
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21. The combination of telephoto capabilities and an f/2.8 aperture throughout the zoom range up to 500mm makes this a great lens for wildlife, sports and for you stargazers, astrophotography.
22. This makes it easier to steady the camera properly, and should help to control camera shake, especially if you frequently use the telephoto zoom lens or longer.
这使得它更容易稳定相机正常，并应有助于控制相机的抖动，特别是如果您经常使用或更长的变焦长焦镜头。
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23. This lens features the improved Vibration Reduction system that allows handheld telephoto shooting, even in less-than-ideally lit conditions.
这只镜头的特点是装有改良的防抖系统，即使在光线不理想的条件下也可以手持远距拍摄。
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24. Using the telephoto end of the zoom lens introduces a drop in lumen output of 22%.
使用变焦镜头的远摄端引入的22％流明输出下降。
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25. By shifting the lens from maximum wide Angle to maximum telephoto, lumen output on the projector is curtailed by 32%.
由转移透镜从最大广角到最大远距照相，流明产品在放映机根据32%削减。
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26. To achieve the lens with compact feature in structure and wide field of view, an inversed telephoto system is used.
为实现系统结构紧凑和大视场的特点，采用反远型结构进行放缩和简化。
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27. To achieve the lens with compact feature in structure and wide field of view, an inversed telephoto system is used.
为实现系统结构紧凑和大视场的特点，采用反远型结构进行放缩和简化。
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In another, they used a telephoto lens to take pictures of a set of keys on a cafe table from the roof of a university building. 在另一次演示中，他们站在一所大学的楼顶上，通过远摄镜头拍到了咖啡桌上的一串钥匙。
Telephoto lenses tend to be difficult to steady. 长焦镜头是很难稳定的。
When shooting in wildness, photographers usually shoot with long telephoto lenses from a distance. 野外拍摄时，一般都在远处使用长焦镜头。
