Nikon Corporation

Fumiaki Ohtake

Azuna Nonaka

Satoshi Miwa

Mami Muratani

Atsuki Ito

An optical system used in an optical apparatus is configured to include a first lens group having positive refractive power, a focusing group that moves along an optical axis at focusing, and a rear group, in order from an object side, so that the first lens group includes a first-A lens group disposed on the object side of the largest air space A in the first lens group, and that all of the following conditional expressions are satisfied:1.00<×()<2.50 and 0.30<1<0.85where FNo is the f-number of the optical system focusing on infinity, TL is the total optical length of the optical system focusing on infinity, f is the focal length of the optical system focusing on infinity, dA is the length on the optical axis of the air space A, and dG1 is the length on the optical axis of the first lens group.

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

An optical system (OL) formed from a preceding lens group (GA) having a negative refractive power, and a succeeding lens group (GB) having a positive refractive power, the lens groups being arranged in order from the object side along the optical axis. The succeeding lens group (GB) has: a focusing group (GF) having a positive refractive power, the focusing group (GF) being positioned furthest toward the object side of the succeeding lens group (GB); and an image-side group (GC) positioned further toward the image side than the focusing group (GF). During focusing from an infinitely distant object to a short-distance object, the focusing group (GF) moves toward the image side along the optical axis and satisfies the following conditional expression.0.78<1 In this conditional expression,

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

An optical system comprises, in order from an object side, a front group GF having positive refractive power, an aperture stop S and a rear group GR. The front group FR comprises a front focusing group GFF having positive refractive power, and the rear group GR comprises a rear focusing group GRF having positive refractive power, upon focusing the front focusing group GFF and the rear focusing group GRF being moved toward the object side, and a predetermined condition being satisfied. Thus, an optical system having a superb optical performance, an optical equipment equipped therewith and a manufacturing method for the optical system are provided.

Optical system, optical equipment, and manufacturing method for optical system

A magnification-variable optical system having a small size, a wide angle of view, and high optical performance, an optical apparatus including the magnification-variable optical system, and a method for manufacturing the magnification-variable optical system are provided, the magnification-variable optical system ZL being used for an optical apparatus and includes a first lens group Ghaving a negative refractive power, and a rear group GR including at least one lens group disposed on an image side of the first lens group G, and is configured so that a distance between lens groups adjacent to each other changes at magnification change and a condition expressed by predetermined condition expressions is satisfied.

Magnification-variable optical system, optical apparatus, and method for manufacturing magnification-variable optical system

A magnification-variable optical system having a small size, a wide angle of view, and high optical performance, an optical apparatus including the magnification-variable optical system, and a method for manufacturing the magnification-variable optical system are provided. A magnification-variable optical system ZL used for an optical apparatus such as a cameraincludes a first lens group Ghaving a negative refractive power and including at least two lenses, and a rear group GR including at least one lens group disposed on an image side of the first lens group G, and is configured so that a distance between lens groups adjacent to each other changes at magnification change and a condition expressed by predetermined condition expressions is satisfied.

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Tokyo, Japan

Fumiaki Ohtake