Abstract: A shake correction method for a camera satisfies 1<f tan ?/Y and includes, when recording an image: driving, by a first shake corrector, a shake correction lens group so that a movement amount thereof with respect to a rotational shake around an axis passing through the optical axis and parallel to a short side of the image is larger than that with respect to a rotational shake around an axis passing through the optical axis and parallel to a long side of the image; and driving, by a second shake corrector, an imaging element so that a movement amount thereof with respect to the rotational shake around the axis passing through the optical axis and parallel to the short side of the image is smaller than that with respect to the rotational shake around the axis passing through the optical axis and parallel to the long side of the image.

Abstract: Provided is a zoom lens system including, from an object side to an image side: a first lens group having positive power; a second lens group having negative power; and a subsequent lens group including at least three lens groups, wherein the subsequent lens group includes two or more positive lens groups, the first lens group includes two or less lens elements, the second lens group includes four or more lens elements, the first lens group, the second lens group and a most image side lens group which disposed closest to the image side move with respect to an image plane in zooming from a wide angle end to a telephoto end, and a lens group disposed between the third lens group and an image plane is moved along an optical axis as a focusing lens group in focusing from an infinity in-focus condition to a close-object in-focus condition.

Abstract: An inner focus lens system comprising a first lens unit and subsequent lens units, wherein the first lens unit: is fixed with respect to an image surface in focusing; and includes a first positive lens element located closest to the object side and a second positive lens element, the subsequent lens units include only a first focusing lens unit located closest to the object side and a second focusing lens unit, at least one of the first focusing lens unit and the second focusing lens unit is composed of two or less lens elements, and the subsequent lens units include an image blur compensating lens unit.

Abstract: A lens system, an interchangeable lens apparatus, and a camera system each include a front group including a first focus lens group that moves with respect to an image surface in focusing from an infinity in-focus condition to a close-object in-focus condition; a rear group including a second focus lens group that moves with respect to the image surface in focusing, the front group and the rear group being located in order from an object side to an image side; a fixed lens group including at least one positive power lens element, the fixed lens group being located between the front group and the rear group and fixed with respect to the image surface in focusing; and an aperture diaphragm. The positive power lens in the fixed lens group satisfies dPgF>0.015 (dPgF is an anomalous dispersibility in a g-line and an F-line of the lens element).

Abstract: A lenses unit for an endoscope includes a lens barrel; a lens serving as a front group lens and lenses serving as a rear group lens, which are housed inside the lens barrel; and an aperture arranged between the front group lens and the rear group lens. An imaging-side final surface of the rear group lens has a structure in which the imaging-side final surface is fixed to a cover glass of an image pickup device with an adhesive layer. A focal distance fF of the front group lens, a focal distance fB of the rear group lens, a focal distance fel of an entire optical lenses group, a total optical length OL of the optical lenses group, and a metal back MB of the optical lenses group satisfy a relationship of fel/fF<0, fel/fB>0, and OL/MB>7.0.

Abstract: A zoom lens system having at least five lens units, each lens unit being composed of at least one lens element, the zoom lens system, in order from an object side to an image side, comprising: a positive first lens unit; and a negative second lens unit, and in order from the image side to the object side, comprising: a positive lens unit ?; a negative lens unit ?; and a positive lens unit ?, wherein the first lens unit is composed of only optical elements having optical power, and in zooming from a wide-angle limit to a telephoto limit, at least the positive first lens unit is fixed with respect to an image surface, the positive lens unit ? moves with respect to the image surface separately from an aperture diaphragm, and the negative lens unit ? moves to the object side.

Abstract: A zoom lens system comprising: a positive first lens unit; a negative second lens unit; a positive third lens unit; a fourth lens unit; and at least one subsequent lens unit, wherein the subsequent lens unit(s) includes a negative lens unit, the first and third lens units are respectively composed of two or less lens elements and four or more lens elements, the first and second lens units move along an optical axis in zooming, and the conditions: 0.0<LGmax/LG2<1.5, 0.2<|f2/fW|, and 0.1<|fe/f2| (LGmax: a maximum value of an axial thickness of the subsequent lens unit(s), LG2: an axial thickness of the second lens unit, fW, f2, and fe: focal lengths of the entire system at a wide-angle limit, the second lens unit, and a negative lens unit located closest to the image side) are satisfied.

Abstract: A zoom lens system, in order from an object side to an image side, comprising: a first lens unit having negative optical power; a second lens unit having positive optical power; a third lens unit having negative optical power; and a fourth lens unit having positive optical power, wherein the third lens unit is composed of two or less lens elements, the fourth lens unit is composed of two or less lens elements, the first lens unit has at least one air space between lens elements constituting the first lens unit, and the condition: Dair/fW>0.75 (Dair: an air space located on the most object side in the first lens unit, fW: a focal length of the entire system at a wide-angle limit) is satisfied; an imaging device; and a camera are provided.

Abstract: An inner focus lens system, in order from an object side, comprising: a first lens unit including a most-object-side negative first lens element; a positive second lens unit; and a negative third lens unit, wherein an aperture diaphragm is included, the first lens unit, the third lens unit, and the aperture diaphragm are fixed relative to an image surface in focusing, the second lens unit moves relative to the image surface in the focusing, and the conditions: BF/Y<1.7 and TH/f>1.6 (BF: distance from an apex of an image-side surface of a most-image-side lens element to the image surface; Y: maximum image height; TH: distance from an apex of an object-side surface of a most-object-side lens element to the apex of the image-side surface of the most-image-side lens element; f: focal length of the lens system) are satisfied.

Abstract: An inner focus lens system, in order from an object side, comprising: a first lens unit including a most-object-side negative first lens element; a positive second lens unit; and a negative third lens unit, wherein an aperture diaphragm is included, the first lens unit, the third lens unit, and the aperture diaphragm are fixed relative to an image surface in focusing, the second lens unit moves relative to the image surface in the focusing, and the conditions: BF/Y<1.7 and TH/f>1.6 (BF: distance from an apex of an image-side surface of a most-image-side lens element to the image surface; Y: maximum image height; TH: distance from an apex of an object-side surface of a most-object-side lens element to the apex of the image-side surface of the most-image-side lens element; f: focal length of the lens system) are satisfied.

Abstract: An inner focus lens system, in order from an object side, comprising: a first lens unit including a most-object-side negative first lens element; a positive second lens unit; and a negative third lens unit, wherein an aperture diaphragm is included, the first lens unit, the third lens unit, and the aperture diaphragm are fixed relative to an image surface in focusing, the second lens unit moves relative to the image surface in the focusing, and the conditions: BF/Y<1.7 and TH/f>1.6 (BF: a distance from an apex of an image-side surface of a most-image-side lens element to the image surface, Y: a maximum image height, TH: a distance from an apex of an object-side surface of a most-object-side lens element to the apex of the image-side surface of the most-image-side lens element, f: a focal length of the lens system) are satisfied.

Abstract: An inner focus lens system comprising lens units each composed of at least one lens element, wherein a most object side lens unit is provided and is fixed with respect to an image surface in focusing, and the conditions: BF/Y<1.7 and (L×FNo)/f<2.2 (BF: a distance from an image side surface apex of a most image side lens element to the image surface, Y=f ×tan ?, L: an overall length of lens system, FNo: a F-number of lens system,f: a focal length of lens system, ?: a half view angle of lens system) are simultaneously satisfied, or only the condition: (L×FNo)/f<2.0 (L: the overall length of lens system, FNo: the F-number of lens system,f: the focal length of lens system) is satisfied.

Abstract: An inner focus lens system comprising a first lens unit and subsequent lens units, wherein an aperture diaphragm is provided, the first lens unit is: fixed with respect to an image surface in focusing; and composed of five or more lens elements including a first positive lens element located closest to the object side and a second positive lens element, the subsequent lens units include at least a first focusing lens unit located closest to the object side and a second focusing lens unit, at least one of the first focusing lens unit and the second focusing lens unit is composed of two or less lens elements, at least one lens element is provided on the image side relative to the aperture diaphragm, and the condition: NF1?NF2 (NF1, NF2: the number of lens elements constituting the first, second focusing lens unit) is satisfied.

Abstract: A zoom lens system having at least five lens units, each lens unit being composed of at least one lens element, the zoom lens system, in order from an object side to an image side, comprising: a positive first lens unit; and a negative second lens unit, and in order from the image side to the object side, comprising: a positive lens unit ?; a negative lens unit ?; and a positive lens unit ?, wherein the first lens unit is composed of only optical elements having optical power, and in zooming from a wide-angle limit to a telephoto limit, at least the positive first lens unit is fixed with respect to an image surface, the positive lens unit ? moves with respect to the image surface separately from an aperture diaphragm, and the negative lens unit ? moves to the object side.

Abstract: A zoom lens system, in order from an object side to an image side, comprising: a first lens unit having positive optical power; a second lens unit having negative optical power; a third lens unit having positive optical power; a fourth lens unit having positive optical power; and a fifth lens unit having negative optical power, wherein the first lens unit is composed of only optical elements having optical power, in zooming from a wide-angle limit to a telephoto limit at the time of image taking, at least the first lens unit is fixed with respect to an image surface, and the condition: 0.7<|M4G/M5G|<11.0 (M4G: an amount of movement of the fourth lens unit with respect to the image surface in zooming, M5G is an amount of movement of the fifth lens unit with respect to the image surface in zooming) is satisfied.

Abstract: An inner focus lens system comprising lens units each composed of at least one lens element, wherein a most object side lens unit is provided and is fixed with respect to an image surface in focusing, and the conditions: BF/Y<1.7 and (L×FNo)/f<2.2 (BF: a distance from an image side surface apex of a most image side lens element to the image surface, Y=f×tan ?, L: an overall length of lens system, FNo: a F-number of lens system, f: a focal length of lens system, ?: a half view angle of lens system) are simultaneously satisfied, or only the condition: (L×FNo)/f<2.0 (L: the overall length of lens system, FNo: the F-number of lens system, f: the focal length of lens system) is satisfied.

Abstract: An inner focus lens system, in order from an object side, comprising: a first lens unit including a most-object-side negative first lens element; a positive second lens unit; and a negative third lens unit, wherein an aperture diaphragm is included, the first lens unit, the third lens unit, and the aperture diaphragm are fixed relative to an image surface in focusing, the second lens unit moves relative to the image surface in the focusing, and the conditions: BF/Y<1.7 and TH/f>1.6 (BF: a distance from an apex of an image-side surface of a most-image-side lens element to the image surface, Y: a maximum image height, TH: a distance from an apex of an object-side surface of a most-object-side lens element to the apex of the image-side surface of the most-image-side lens element, f: a focal length of the lens system) are satisfied.

Abstract: An inner focus lens system comprising a first lens unit and subsequent lens units, wherein the first lens unit: is fixed with respect to an image surface in focusing; and includes a first positive lens element located closest to the object side and a second positive lens element, the subsequent lens units include only a first focusing lens unit located closest to the object side and a second focusing lens unit, at least one of the first focusing lens unit and the second focusing lens unit is composed of two or less lens elements, and the subsequent lens units include an image blur compensating lens unit.

Abstract: An inner focus lens system comprising a first lens unit and subsequent lens units, wherein an aperture diaphragm is provided, the first lens unit is: fixed with respect to an image surface in focusing; and composed of five or more lens elements including a first positive lens element located closest to the object side and a second positive lens element, the subsequent lens units include at least a first focusing lens unit located closest to the object side and a second focusing lens unit, at least one of the first focusing lens unit and the second focusing lens unit is composed of two or less lens elements, at least one lens element is provided on the image side relative to the aperture diaphragm, and the condition: NF1?NF2 (NF1, NF2: the number of lens elements constituting the first, second focusing lens unit) is satisfied.

Abstract: A zoom lens system, in order from an object side to an image side, comprising: a first lens unit having positive optical power; and at least one subsequent lens unit, wherein in zooming from a wide-angle limit to a telephoto limit at the time of image taking, an interval between the first lens unit and a lens unit which is one of the at least one subsequent lens unit varies, the condition: fT/fW>10.5 (fW: a focal length of the entire system at a wide-angle limit, fT: a focal length of the entire system at a telephoto limit) is satisfied, and at least one lens element among all the lens elements constituting the lens system satisfies the condition: ((?1Gg??1GF)+0.0018×?1Gd)/(?1GF??1GC)>0.8978 (?1Gn: a refractive power to the n-line of the first lens unit).