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.
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.
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.
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.
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