Some such telescopes were built so that film or some other equipment could be placed inside the tube, or perhaps a bit beyond the upper end, to capture light that had reflected only off the primary mi
有些这类的望远镜做成制作得可以把胶片等装置安放在镜筒内部或高出镜口一点的位置上,捕捉仅从主镜面反射的光。
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