摘要
紫台口径４０ｃｍ（Ｆ／７ ．５） 双筒天体照相仪，一镜筒改用ＣＣＤ 接收器。本文设计了双分离透镜改正镜，符合ＣＣＤ 的光谱响应。试验结果表明，成象质量明显提高。
A corrector is designed for the PMO 40cm (F/7.5) double astrograph to improve chromatic aberration in visible and red wave length, which is more sensitive for CCD. The test result has shown that the star image is improved distinctly when the corrector is used.
