Abstract: A variable magnification optical system (ZL) comprises a first lens group (G1) having negative refractive power, and a rear group (GR) having at least one lens group, the distance between lens groups adjacent to each other changes when the magnification is changed, and the following conditional expression is satisfied. 0.90<TLt/ft<1.50 where TLt is the total length of the variable magnification optical system (ZL) in a telephoto end state, and ft is the focal distance of the variable magnification optical system (ZL) in the telephoto end state.

Abstract: 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<FNo×(TL/f)2<2.50 and 0.30<dA/dG1<0.85 where 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.

Abstract: An optical system comprising a plurality of lens groups arranged on an optical axis and comprising a leading lens group, a first focal lens group, and a second focal lens group. The leading lens group is arranged further on the object side than the first focal lens group and the second focal lens group is arranged further on the image side than the first focal lens group. The first focal lens group has positive refractive power and moves along the optical axis to the image side when focusing from an infinite object to a short-distance object. The second focal lens group: has a negative refractive power; travels along the optical axis to the object side when focusing from an infinite object to a short-distance object; and has, between the first focal lens group and the second focal lens group, an intermediate lens group that includes at least one lens.

Abstract: The present invention comprises a first lens group (G1) having a positive refractive power and a rear group (GR) having a plurality of lens groups, the first lens group and the rear group being arranged side by side on the optical axis in order from an object side, wherein: when the magnification is varied from a wide-angle end to a telephoto end, the distance between the first lens group (G1) and the rear group (GR) changes; distances between the plurality of lens groups constituting the rear group (GR) change from each other; the rear group (GR) has, in order from the object side, a first focusing lens group (GF1) having a negative refractive power and a second focusing lens group (GF2) having a negative refractive power; both the first and second focusing lens groups move toward an image side on the optical axis when focusing from infinity to a short distance position; and the following conditional expression is satisfied. 0.000<(MWF1/MTF1)/(MWF2/MTF2)<0.

Abstract: A variable-power optical system (ZL) is constituted by, in order from the object side and along the optical axis, the following: a first lens group (G1) that has a positive refractive power; a second lens group (G2); a third lens group (G3) that has a negative refractive power; and a rear group (GR) that includes a plurality of lens groups. When power is varied from the wide-angle end to the telephoto end, the interval between the first lens group and the second lens group increases, the interval between the second lens group and the third lens group increases, and the interval between the third lens group and a lens group in the rear group positioned closest to the object decreases, thus satisfying the following conditional equation: 0.10<D1/D2<1.

Abstract: 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<fB/fC<1.00 In this conditional expression, fB is the focal distance of the succeeding lens group GB, and fC is the focal distance of the image-side group GC.

Abstract: A variable magnification optical system (ZL) comprises a preceding lens group (GA) having negative refractive power and a succeeding lens group (GB) having positive refractive power, which are arranged in order from the object side along an optical axis. The succeeding lens group (GB) has a focusing group (GF) and an image-side group (GC) disposed closer to the image side than the focusing group (GF), the focusing group (GF) moves to the image side along the optical axis from focusing on an object at infinity to focusing on a close-distance object, and the following conditional expression is satisfied. 1.80<fF/fBaw FNow<3.40 where fF is the focal length of the focusing group (GF), fBaw is the focal length in the wide-angle end state of an image-side lens group (GBa) composed of lenses disposed on the image side from the focusing group (GF), and FNow is the F-number of the variable magnification optical system (ZL) in the wide-angle end state.

Abstract: An optical system having high optical performance, an optical apparatus including the optical system, and a method for manufacturing the optical system are provided. An optical system used for an optical apparatus such as a camera includes a front lens group including a diffraction lens having a diffraction surface and a rear lens group disposed on an image side of the front lens group. The optical system is configured so that an interval between the lens groups changes at magnification change. The optical system is also configured so that a condition expressed by a predetermined conditional expression is satisfied.

Abstract: 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 camera 1 includes a first lens group G1 having 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 G1, 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.

Abstract: 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 camera 1 includes a first lens group G1 having 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 G1, 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.

Abstract: 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.