Abstract: A zoom optical system (ZL) comprises, in order from an object: a first lens group (G1) having positive refractive power; an intermediate group (GM) including at least one lens group and having negative refractive power as a whole; an intermediate side lens group (GRP1) having positive refractive power; a subsequent side lens group (GRP2) having positive refractive power; and a subsequent group (GR) including at least one lens group. The subsequent side lens group (GRP2) moves upon focusing. A following conditional expression is satisfied: 2.5<f1/fRP1<5.0 where, f1 denotes a focal length of the first lens group (G1), and fRP1 denotes a focal length of the intermediate side lens group (GRP1).

Abstract: Comprising a positive first lens group G1 disposed at a most object side, a negative intermediate group G2 disposed at an image side of the first lens group G1, a positive focusing group G3 disposed at an image side of the intermediate group G2, the focusing group G3 being moved upon focusing, and a positive image side group G4 disposed at an image side of the focusing group G3; upon varying magnification, a distance between the first lens group G1 and the intermediate group G2, a distance between the intermediate group G2 and the focusing group G3 and a distance between the focusing group G3 and the image side group G4 being varied; and a predetermined conditional expression being satisfied. Whereby a variable magnification optical system having excellent optical performance and a focusing lens group reduced in weight in order to attain high speed focusing operation, and others are provided.

Abstract: Comprising a positive first lens group G1 disposed at a most object side, a negative intermediate group G2 disposed at an image side of the first lens group G1, a positive focusing group G3 disposed at an image side of the intermediate group G2, the focusing group G3 being moved upon focusing, and a positive image side group G4 disposed at an image side of the focusing group G3; upon varying magnification, a distance between the first lens group G1 and the intermediate group G2, a distance between the intermediate group G2 and the focusing group G3 and a distance between the focusing group G3 and the image side group G4 being varied; and the image side group G4 comprising, in order from an object side, a positive A group G4A, a negative B group G4B satisfying a predetermined conditional expression with respect to the A group G4A, and a C group G4C, whereby a variable magnification optical system having excellent optical performance and a focusing lens group reduced in weight in order to attain high speed focu

Abstract: A variable magnification optical system includes: a first lens group having a positive refractive power and arranged closest to an object; a negative lens group having a negative refractive power and arranged closer to an image than the first lens group; a positive lens group which has a positive refractive power, which includes at least one lens that moves integrally with an aperture stop, and which is arranged closer to the image than the negative lens group; and a focusing group arranged between the negative lens group and the positive lens group, wherein when varying magnification, the first lens group moves with respect to an image plane, the distance between the first lens group and the negative lens group is changed, and the distance between the negative lens group and the positive lens group is changed, wherein when focusing, the distance between the focusing group and a lens arranged at a position to face an object-side of the focusing group is changed, and the distance between the focusing group and

Abstract: Comprising, in order from an object side: a first lens group G1 having negative refractive power; a second lens group G2 having positive refractive power; a third lens group G3 having negative refractive power; a fourth lens group G4 having positive refractive power; a fifth lens group G5 having negative refractive power; and a sixth lens group G6 having positive refractive power; upon varying magnification, air distances between the neighboring lens groups G1-G6 being varied; and a predetermined conditional expression being satisfied, thereby providing a variable magnification optical system which has excellent optical performance, an optical apparatus, and a method for manufacturing a variable magnification optical system.

Abstract: A zoom optical system comprises, in order from an object: a first lens group (G1) having positive refractive power; a second lens group (G2) having negative refractive power; and a subsequent group (GR) including at least one lens group. Upon zooming, distances between the first lens group (G1) and the second lens group (G2) and between the second lens group (G2) and the subsequent group (GR) change. The subsequent group (GR) comprises a focusing group (Gfc) having negative refractive power for focusing. The first lens group (G1) comprises a 1-1st lens that has positive refractive power and is disposed closest to the object. The focusing group comprises a lens (L37) having positive refractive power and a lens (L38) having negative refractive power. Following conditional expressions are satisfied: 1.00<fFP/(?fFN)<2.00 1.80<f1/fw<2.

Abstract: A variable magnification optical system is provided which includes, in order from an object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, a fourth lens group G4, and a subsequent lens group GR. Upon zooming, each of distances between the first lens group G1 and the second lens group G2, between the second lens group G2 and the third lens group G3, between the third lens group G3 and the fourth lens group G4, between the fourth lens group G4 and the subsequent lens group GR is varied, and upon focusing, the third lens group G3 is moved along an optical axis. A predetermined condition is satisfied. Consequently, the optical system enables a focusing lens group to be downsized and made light and also enables high speed auto focusing and quietness upon auto focusing to be realized without increasing the size of a barrel.

Abstract: A variable magnification optical system comprises, in order from an object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power and a fourth lens group G4 having negative refractive power; upon varying a magnification, a distance between the first lens group G1 and the second lens group G2 being varied, a distance between the second lens group G2 and the third lens group G3 being varied, and a distance between the third lens group G3 and the fourth lens group G4 being varied; upon focusing, the fourth lens group being moved; and a predetermined conditional expression being satisfied.

Abstract: A variable magnification optical system comprises, in order from an object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power and a fourth lens group G4 having negative refractive power; upon varying a magnification, a distance between the first lens group G1 and the second lens group G2 being varied, a distance between the second lens group G2 and the third lens group G3 being varied, and a distance between the third lens group G3 and the fourth lens group G4 being varied; upon focusing, the fourth lens group G4 being moved; and a predetermined conditional expression being satisfied.

Abstract: A variable magnification optical system comprising, in order from an object side, a first lens group having negative refractive power, a first intermediate lens group having positive refractive power, a second intermediate lens group having negative refractive power and a rear lens group; upon varying a magnification from a wide angle end state to a telephoto end state, a distance between the first lens group and the first intermediate lens group being varied, a distance between the first intermediate lens group and the second intermediate lens group being varied, and a distance between the second intermediate lens group and the rear lens group being varied; the rear lens group comprising at least one focusing lens group which is moved upon carrying out focusing from an infinitely distant object to a closely distant object; and predetermined conditional expressions being satisfied, thereby the focusing lens group(s) being reduced in weight.

Abstract: A variable magnification optical system comprising, in order from an object side, a first lens group having negative refractive power, a first intermediate lens group having positive refractive power, a second intermediate lens group having negative refractive power and a rear lens group; upon varying a magnification from a wide angle end state to a telephoto end state, a distance between the first lens group and the first intermediate lens group being varied, a distance between the first intermediate lens group and the second intermediate lens group being varied, and a distance between the second intermediate lens group and the rear lens group being varied; the rear lens group comprising at least one focusing lens group which is moved upon carrying out focusing from an infinitely distant object to a closely distant object; and predetermined conditional expressions being satisfied, thereby the focusing lens group(s) being reduced in weight.

Abstract: A zoom optical system ZL comprises, in order from an object: a first lens group (G1) having a positive refractive power; a second lens group (G2) having a negative refractive power; a third lens group (G3) having a positive refractive power; and a subsequent lens group (GR), wherein upon zooming, a distance between the first lens group (G1) and the second lens group (G2) changes, a distance between the second lens group (G2) and the third lens group (G3) changes, and a distance between the third lens group (G3) and the subsequent lens group (GR) changes, the subsequent lens group (GR) comprises a focusing lens group that moves upon focusing, and following conditional expressions are satisfied, 0.18<(?fF)/f1<0.30, 0.84<(?f2)/f3<1.20, where fF: a focal length of the focusing lens group, f1: a focal length of the first lens group (G1), f2: a focal length of the second lens group (G2), and f3: a focal length of the third lens group (G3).

Abstract: A zoom optical system (ZL) comprises, in order from an object: a first lens group (G1) having a positive refractive power; a second lens group (G2) having a negative refractive power; a third lens group (G3) having a positive refractive power; and a subsequent lens group (GR), wherein upon zooming, a distance between the first lens group (G1) and the second lens group (G2) changes, a distance between the second lens group (G2) and the third lens group (G3) changes, and a distance between the third lens group (G3) and the subsequent lens group (GR) changes, the subsequent lens group (GR) comprises a focusing lens group that moves upon focusing, and following conditional expressions are satisfied, 3.70<f1/(?f2)<5.00, 3.20<f1/f3<5.00, where f1: a focal length of the first lens group (G1), f2: a focal length of the second lens group (G2), and f3: a focal length of the third lens group (G3).

Abstract: A zoom optical system comprises, in order from an object: a front lens group (GFS) having a positive refractive power; an M1 lens group (GM1) having a negative refractive power; an M2 lens group (GM2) having a positive refractive power; an RN lens group (GRN) having a negative refractive power; and a subsequent lens group (GRS). Upon zooming, the distance between the front lens group (GFS) and the M1 lens group (GM1) changes, the distance between the M1 lens group (GM1) and the M2 lens group (GM2) changes, and the distance between the M2 lens group (GM2) and the RN lens group (GRN) changes. Upon focusing from an infinite distant object to a short distant object, the RN lens group (GRN) moves.

Abstract: A zoom optical system comprises, in order from an object: a front lens group (GFS) having a positive refractive power; an M1 lens group (GM1) having a negative refractive power; an M2 lens group (GM2) having a positive refractive power; and an RN lens group (GRN) having a negative refractive power, wherein upon zooming, distances between the front lens group and the M1 lens group, between the M1 lens group and the M2 lens group, and between the M2 lens group and the RN lens group change, upon focusing from an infinite distant object to a short distant object, the RN lens group moves, the RN lens group comprises at least one lens having a positive refractive power, and at least one lens having a negative refractive power, and following conditional expressions are satisfied, 2.70<fFP/(?fFN)<4.50, 0.25<(?fF)/f1<0.

Abstract: A zoom optical system (ZL) comprises, in order from an object: a first lens group (G1) having a positive refractive power; a second lens group (G2) having a negative refractive power; a third lens group (G3) having a positive refractive power; and a subsequent lens group (GR), wherein upon zooming, a distance between the first lens group (G1) and the second lens group (G2) changes, a distance between the second lens group (G2) and the third lens group (G3) changes, and a distance between the third lens group (G3) and the subsequent lens group (GR) changes, the subsequent lens group (GR) comprises a focusing lens group that moves upon focusing, and the second lens group (G2) comprises a partial group that satisfies following conditional expressions, 1.40<fvr/f2<2.30, 1.80<f1/fw<3.

Abstract: A zoom optical system comprises, in order from an object: a front lens group (GFS) having a positive refractive power; an M1 lens group (GM1) having a negative refractive power; an M2 lens group (GM2) having a positive refractive power; and an RN lens group (GRN) having a negative refractive power, wherein upon zooming, distances between the front lens group and the M1 lens group, between the M1 lens group and the M2 lens group, and between the M2 lens group and the RN lens group change, upon focusing from an infinite distant object to a short distant object, the RN lens group moves, and the M2 lens group comprises an A lens group that satisfies a following conditional expression, 1.10<fvr/fTM2<2.00, where, fvr: a focal length of the A lens group, and fTM2: a focal length of the M2 lens group in a telephoto end state.

Abstract: A variable magnification optical system comprising a positive first lens group G1 disposed at a most object side, a negative second lens group G2 disposed at an image side of the first lens group G1 and a positive rear group GR disposed at an image side of the second lens group G2, upon varying magnification from an wide angle end state to a telephoto end state, the first lens group G1 being moved toward the object side, a distance between the first lens group G1 and the second lens group G2 and a distance between the second lens group G2 and the rear group GR being varied, and the rear group GR comprising a focusing group that is moved upon focusing, an A group having positive refractive power and a B group satisfying a given conditional expression with respect to the A group and having negative refractive power. Thus, the variable magnification optical system has excellent optical performance and the focusing group reduced in weight in order to attain high speed focusing operation.

Abstract: Composing, in order from an object side along the optical axis, a first lens group having positive refractive power, and at least one lens group; upon varying magnification, an interval between the first lens group and a lens group at an image side of the first lens group and adjacent thereto being varied, said first lens group comprising a focusing lens group which is moved along the optical axis for focusing and a vibration reducing lens group that is movable to include a component in a direction perpendicular to the optical axis, thereby providing a an excellent optical performance upon focusing.

Abstract: Composing, in order from an object side, a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power and at least one lens group G3; upon varying magnification, a distance between the first lens group G1 and the second lens group G2, a distance between the second lens group G2 and a lens group G3 at an image side of the second lens group G2 and adjacent thereto, being varied; and a given conditional expression being satisfied; thereby providing a variable magnification optical system having a superb optical performance upon focusing, an optical device and a method for manufacturing the variable magnification optical system.