Optical glass, optical elements using optical glass, optical systems, interchangeable lenses, optical devices, and methods for manufacturing optical glass.

摘要

PROBLEM TO BE SOLVED: To provide an optical glass having a high refractive index (nd), a small Abbe number (νd), a small ΔPg and an F value, and excellent in devitrification resistance. SOLUTION: In% by mass, SiO2 component: 17 to 35%, B2O3 component: 0 to 13%, ZrO2 component: 0 to 10%, Nb2O5 component: 34 to 52%, Na2O component: 0 to 10%, MgO component: It is more than 0 to 10%, Li2O component: more than 0 to 10%, WO3 component: 0 to 3%, and the ratio of SiO2 to MgO (SiO2 / MgO) is 5 to 27.5 on a mass% basis. , Optical glass. [Selection diagram] None