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US 2025/0085509 A1Published application
Optical system, optical apparatus, and method for manufacturing optical system
AssigneeNikon Corporation
InventorTakamichi KURASHIGE
Life of this patent
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AssigneeNikon Corporation
InventorTakamichi KURASHIGE
Estimating the term…
An optical system including, in order from an object side, a first negative lens having negative refractive power, a second negative lens having negative refractive power, and a rear group is configured so as to satisfy the following conditional expressions: 5.6 < TL / f < 1 3 . 0 0 0.3 < f 1 / f 2 < 2. 1.66 < Nave 12 < 2 . 2 0 80. < 2 ω where TL is the total length of the optical system; f, f1, and f2 are the focal lengths of the optical system, the first negative lens, and the second negative lens, respectively; Nave12 is an average of the refractive indices of the first and second negative lenses; and 2ω is the total field angle of the optical system.
An optical system comprising, in order from an object side, a first negative lens having negative refractive power, a second negative lens having negative refractive power, and a rear group,
An optical system comprising, in order from an object side, a first negative lens having negative refractive power, a second negative lens having negative refractive power, and a rear group,
An optical system comprising, in order from an object side, a first negative lens having negative refractive power, a second negative lens having negative refractive power, and a rear group,
A method for manufacturing an optical system including, in order from an object side, a first negative lens having negative refractive power, a second negative lens having negative refractive power, and a rear group,
Dependencies are inferred from the claim text.