星星(点光源)的亮度只是望远镜孔径的函数-孔径越大，图像越亮。
The brightness of stars (point sources) is only a function of telescope aperture-the larger the aperture, the brighter the images.
这是指望远镜的焦距与其孔径的比值。
This is the ratio of the focal length of the telescope to its aperture.
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.
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