Describing a lens or optical system that is free from both spherical aberration and coma (see Coma, Optical). Examples of aplanatic systems include some types of achromatic lens and the Ritchey–Chrétien telescope.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。