Optical system, optical apparatus and method for manufacturing the optical system

A method for manufacturing an optical system, the method comprising:

• a step of arranging an aperture stop and at least one lens in a lens barrel so that the lens is provided closer to an object than the aperture stop, the lens satisfying the following conditional expressions:
• 50.00<νdLZ<65.00,
• 0.545<θgFLZ≤0.5583,
• −0.010<θgFLZ−(0.6418−0.00168×νdLZ)
• where
• νdLZ:
• a refractive index of the lens for d-line,
• νdLZ:
• an Abbe number of the lens with reference to d-line, and
• θgFLZ:
• a partial dispersion ratio of the lens, defined by a following expression when a refractive index of the lens for g-line is ngLZ, a refractive index of the lens for F-line is nFLZ, and a refractive index of the lens for C-line is nCLZ:
• θgFLZ=(ngLZ−nFLZ)/(nFLZ−nCLZ).