Meniscus corrector
negative meniscus lens that is used to correct spherical aberration in image-forming optical systems such as catadioptric telescopes
en-GB/ˈmɛnɪskəs kəˈɹɛktə/
en-US/mɪˈnɪskəs kəˈɹɛktɚ/
negative meniscus lens that is used to correct spherical aberration in image-forming optical systems such as catadioptric telescopes