另一个则是需要在天文望远镜的视场和放大率之间进行取舍。
Another is the trade off between a telescope's field of view and its magnification.
在实际使用中，望远镜有上限和下限放大率。
There are practical upper and lower limits of power for telescopes.
霍洛·维茨博士已经建好了一个合适的探测仪，因为对放大率的要求不高，所以这个探测仪能够观测到较广的太空视场。
Dr Horowitz has already set up one suitable detector and this, because no huge magnification is involved, is capable of looking at broad swathes of sky.
对于任何放大率的望远镜，孔径越大，其成像亮度越高，成像边缘越锋利。
At any given magnification, the larger the aperture, the brighter and sharper the image will be.
通过调解镜头中和传感器底部的水压就能完成改变摄像头放大率的功能。
Modulating the water pressure in the lens and below the sensors, makes it possible to produce a variety of magnifications.
通过将水注入各个元件来改变摄像头获取图像的放大率。
Water is pumped into both components to change the magnification of the image captured by the camera.
更高的放大率通常用于月亮，行星和双子星的观察。
The higher powers are mainly used for lunar, planetary, and binary star observations.
由于目镜是可更换的，望远镜根据需要可以有不同的放大率。
Since eyepieces are interchangeable, a telescope can be used at a variety of powers for different applications.
当观察扩展光源时，目镜中所看到的亮度只跟孔径和放大率有关，它跟焦比并没有关系。
When viewing extended objects, the apparent brightness seen in the eyepiece is a function only of aperture and magnification, it is not related to focal ratio.
较宽的目镜视场搭配较低的放大率可以得到更宽的视场角。
An eyepiece with wide apparent field (in degrees) and lower powers used on a telescope allow wider fields of view.
如果放大率超过这个上限，图像往往会变得昏暗，对比度降低等。
Powers higher than this usually give you a dim, lower contrast image.
以300% - 400%的放大率来处理，但是要频繁切换到全景图，以查看效果图。
Work at 300 to 400% magnification, but switch frequently back to overall view, to see how the finished image starts to look like.
切换蒙版，褪去涂层，200% - 400%的高放大率能使你覆盖掉你稍后想要处理的区域。
Switching between masking, and unmasking and working at a high magnification of 200 to 400%, allows you to cover exactly the area you will want to work on later.
在低放大率的情况下，扩展光源往往显得更亮一些。
Extended objects will always appear brighter at lower magnifications.
客户还可以定制取景器的放大率和取景器明线的位置(框住透过取景器看到的图像的小框)。
Customers can also configure the viewfinder's magnification and the location of its bright lines (that little box that frames the image you see when you look through the viewfinder).
比如，与焦距为1000mm的望远镜相比，2000mm焦距望远镜的放大率和视场范围分别是前者的2倍和1/2。
For example, a telescope with a focal length of 2000mm has twice the power and half the field of view of a 1000mm telescope.
比如，孔径为60mm(即2.4英寸孔径)的望远镜最大放大率为142x。
For example, the maximum power on a 60mm telescope (2.4 "aperture) is 142x."
大的望远镜放大率同时放大了不稳定大气的影响。
A large telescope magnification also magnifies the influence of unsteady air.
本文利用耦合波理论分析推导了单模平面光波导中两波混合的耦合波方程和弱相干光放大率的表示式。
The coupled equation of two-wave mixing and expressions for weak beam amplification in a single mode waveguide are deduced by application of coupled wave theory.
通过分析该模型中物与像的对应关系，得出了射影失真产生的根源是光学系统放大率的不恒定，并与相机的外参数：倾角及视场的大小有着非线性的变化关系。
The reason for Projective distortion that the amplification ratio is not constant but has nonlinear relation with pitch and tilt angles and field of view of cameras was found out.
请设计并制造一个声学菲涅耳透镜并研究其性质(例如放大率)作为相关参量的函数。
Design and produce an acoustic lens and investigate its properties, such as amplification, as a function of relevant parameters.
本文给出了二级近似时近轴球面反射成像的物象规律，进而讨论了横向放大率与像差。
The more exact object image law of reflection image on axial spherical surface is presented, the lateral magnification and aberration are discussed.
倾斜角度摄影和平行移动摄影的拼接图像与单幅摄影图像的放大率基本一致。
Mosaicked images from oblique or parallel photography yielded rates of magnification comparable to those in single photographic images.
倾斜放大率有助于光学成像系统的优化设计，并可以进行成像大小的精确计算。
The slantwise magnification can give a help to design of optimized optical image system easily and calculate the size of image accurately.
从理论上分析了系统分辨力与细分数、光栅周期、放大率和倾角等参数的关系，并通过实验在阿贝比长仪上进行了检验。
The relations of systemic resolution to subdivision number, grating period, magnifying power and tilt Angle are theoretically discussed and experimentally checked on the Abbe comparator.
从理论上分析了系统分辨力与细分数、光栅周期、放大率和倾角等参数的关系，并通过实验在阿贝比长仪上进行了检验。
The relations of systemic resolution to subdivision number, grating period, magnifying power and tilt Angle are theoretically discussed and experimentally checked on the Abbe comparator.
应用推荐