本帖最后由 JamesHe 于 2024-1-1 23:29 编辑
主镜焦比是F0.87。
摘自欧洲南方天文台官网:
The focal ratio of the primary mirror (M1) is f/0.87. The total Nasmyth field of view is 10 arc minutes, limited by the dimensions of the way-through hole in one of the flat folding mirrors (M4). As-designed optical quality is diffraction limited up to the edge of the curved field at all wavelengths.
主镜以后的光路怎么玩,都不影响这点。
初学者都知道加个巴洛镜,焦比就会变大。这个影响主镜的焦比吗?
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