OPTICAL GLASS, OPTICAL ELEMENT COMPOSED OF OPTICAL GLASS, OPTICAL SYSTEM, INTERCHANGEABLE LENS AND OPTICAL DEVICE

摘要

This optical glass satisfies that, in terms of mol% of cations, the total amount of La³⁺, Y³⁺ and Gd³⁺ components is 5-65%, the total amount of Zr⁴⁺, Hf⁴⁺ and Ta⁵⁺ components is 5-65%, and satisfies the relationship expressed by formula (1) below. (La³⁺ + Y³⁺ + Gd³⁺) × (Zr⁴⁺ + Hf⁴⁺ + Ta⁵⁺) ≥ 400···(1)