Optical system, optical apparatus, and method of manufacturing optical system

A method of manufacturing an optical system, comprising following features (a) or (B):

• (A) disposing lenses within a lens barrel so as to include a lens satisfying the following conditional expressions:
• νdLZ<35.0
• 0.702<θgFLZ+(0.00316×νdLZ)≤0.7179,
• where
• νdLZ:
• Abbe number of the lens with reference to d-line, and
• θgFLZ:
• a partial dispersion ratio of the lens, wherein θgFLZ is defined by the following expression:
• θgFLZ=(ngLZ−nFLZ)/(nFLZ−nCLZ)
• wherein a refractive index of the lens with reference to g-line is ngLZ, a refractive index of the lens with reference to F-line is nFLZ, and a refractive index of the lens with reference to C-line is nCLZ,
• (B) disposing lenses within a lens barrel so as to include a glass lens satisfying the following conditional expressions:
• νdLZ<35.0
• 0.702<θgFLZ+(0.00316×νdLZ),
• where
• νdLZ:
• Abbe number of the lenses with reference to d-line, and
• θgFLZ=(ngLZ−nFLZ)/(nFLZ−nCLZ)
• where a refractive index of the lens with reference to g-line is ngLZ, a refractive index of the lens with reference to F-line is nFLZ, and a refractive index of the lens with reference to C-line is nCLZ.

An optical system comprising a glass lens satisfying following conditional expressions:

• νdLZ<35.0
• 0.702<θgFLZ+(0.00316×νdLZ),
• where
• νdLZ:
• Abbe number of the lens with reference to d-line, and
• θgFLZ:
• a partial dispersion ratio of the lens,
• wherein θgFLZ is defined by the following expression:
• θgFLZ=(ngLZ−nFLZ)/(nFLZ−nCLZ)
• wherein a refractive index of the lens with reference to g-line is ngLZ, a refractive index of the lens with reference to F-line is nFLZ, and a refractive index of the lens with reference to C-line is nCLZ.