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.
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