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.
为了计算出射光瞳，可将孔径(单位mm)除以目镜的放大倍数。
To calculate exit pupil, divide the aperture (in mm) by the power of the eyepiece being used.
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.
该文介绍的用测微目镜将干涉条纹放大，再进行测量的方法很好地解决了这个问题。
A method that prior to measurement the fringes are amplified by using micrometer eyepiece is presented in this paper for resolving the problem.
这种目镜之所以是绿色的，是因为当使用目镜者摘下目镜时，瞳孔可以继续保持放大状态，这样就可以微弱的光线中保持“夜光眼”。
The reason it's in green is because when you put the unit down, you want your eyes to remain dilated so you can see in dim light.
这种目镜之所以是绿色的，是因为当使用目镜者摘下目镜时，瞳孔可以继续保持放大状态，这样就可以微弱的光线中保持“夜光眼”。
The reason it's in green is because when you put the unit down, you want your eyes to remain dilated so you can see in dim light.
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