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王欣
王欣
Optic system of a 2.4m class telescope working at Cassegrain focus and Nasmyth platforms, is a R-C system using focal ratio of primary mirror corresponding to f/1.5,f/2.3 and f/3. A number of methods for testing the quality of aspheric convex secondary mirror with primary focal ratio f/3 have been presented. The 2.4m class telescope requires secondary mirror larger , more aspheric and more accurately figured. In this paper I list a comparison with data of measuring this giant optics using the Hi
