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AssigneeNikon Corporation
InventorsYoko Komatsubara, Takeshi Umeda
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A variable magnification optical system comprising, in order from an object side, a first lens group having negative refractive power, a second lens group having positive refractive power, a third lens group and a fourth lens group; upon varying a magnification, respective distances between neighboring lens groups being varied; the first lens group comprising a negative lens at a most object side and a positive lens at a most image side, the negative lens being a negative meniscus lens having a convex surface facing the object side; and the second lens group comprising, in order from the object side, a 2a lens group having positive refractive power, a 2b lens group having positive refractive power, and a 2c lens group. The optical system satisfies specified conditional expressions.
A variable magnification optical system comprising, in order from an object side, a first lens group having negative refractive power, a second lens group having positive refractive power, a third lens group and a fourth lens group;
A method for manufacturing a variable magnification optical system comprising, in order from an object side, a first lens group having negative refractive power, a second lens group having positive refractive power, a third lens group and a fourth lens group, the method comprising:
Dependencies are inferred from the claim text.