Abstract: A zoom optical system includes, in order from an object, a first lens group, a second lens group, and a third lens group having positive, negative, and positive refractive powers, respectively. The first lens group moves toward the object and air distances between the first to third lens groups vary upon zooming from a wide-angle end state to a tele-photo end state. The first lens group comprises a cemented lens consisting of a negative lens and a positive lens in order from the object. The following conditional expressions are satisfied: 4.40<f1/(?f2)<8.00 0.60<f3/fw<3.50 0.60<(?f2)/f3<1.05 30.00°<?w<80.000 f1, f2, and f3 denoting focal lengths of the first to third lens groups, respectively, and fw and ow denoting a focal length of the zoom optical system and a half angle of view in the wide-angle end state, respectively.

Abstract: A zoom optical system (ZL) comprises a first negative lens group (G2) having a negative refractive power; and a second negative lens group (G4) disposed closer to an image than the first negative lens group (G2), wherein a distance between the first negative lens group (G2) and the second negative lens group (G4) changes during zooming, at least part of the first negative lens group (G2) is movable so as to have a displacement component in a direction perpendicular to an optical axis, at least part of the second negative lens group (G4) is movable along the optical axis during focusing, and the following conditional expression, 0.50<fGb/fGa<2.60 is satisfied, where, fGa: a focal length of the first negative lens group (G2), and fGb: a focal length of the second negative lens group (G4).

Abstract: A zoom optical system (ZL) comprises a first negative lens group (G2) having a negative refractive power; and a second negative lens group (G4) disposed closer to an image than the first negative lens group (G2), wherein a distance between the first negative lens group (G2) and the second negative lens group (G4) changes during zooming, at least part of the first negative lens group (G2) is movable so as to have a displacement component in a direction perpendicular to an optical axis, at least part of the second negative lens group (G4) is movable along the optical axis during focusing, and the following conditional expression, 0.50<fGb/fGa<2.60 is satisfied, where, fGa: a focal length of the first negative lens group (G2), and fGb: a focal length of the second negative lens group (G4).

Abstract: An optical system (LS) includes lenses (L22,L23) satisfying the following conditional expressions, ?dLZ<35.0, and 0.702<?gFLZ+(0.00316×?dLZ), where ?dLZ: Abbe number of the lens with reference to d-line, and ?gFLZ: a partial dispersion ratio of the lens, wherein ?gFLZ is defined by the following expression, ?gFLZ=(ngLZ?nFLZ)/(nFLZ?nCLZ). wherein a refractive index of the lens with reference to g-line is ngLZ, a refractive index of the lens with reference to F-line is nFLZ, and a refractive index of the lens with reference to C-line is nCLZ.

Abstract: An optical system (LS) has an aperture stop (S), and a negative lens (L73) disposed closer to the image side than the aperture stop (S) and satisfying the following conditional expressions. ?0.010<ndN2?(2.015?0.0068×?dN2), 50.00<?dN2<65.00, 0.545<?gFN2, ?0.010<?gFN2?(0.6418?0.00168×?dN2) where ndN2 is the refractive index to the d line of the negative lens, ?dN2 is the Abbe number with respect to the d line of the negative lens, and ?gFN2 is the partial dispersion ratio of the negative lens.

Abstract: An imaging device includes an image formation optical system, a light division member configured to amplitude-divide light which has passed through at least a part of the image formation optical system, a first imaging unit configured to capture a first image formed by one light flux divided by the light division member, a second imaging unit configured to capture a portion in a second image formed by the other light flux divided by the light division member, and a driving unit configured to move the second imaging unit in a direction crossing a light path of the other light flux.

Abstract: Comprising, in order from an object side: a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having positive refractive power, and a fifth lens group having negative refractive power; upon varying a magnification, the first lens group being fixed with respect to the image plane, and each distance between the neighboring lens groups being varied; upon focusing, at least a portion of the fourth lens group being moved; and predetermined conditional expression(s) being satisfied, thereby variations in various aberrations upon varying magnification being superbly suppressed.

Abstract: An optical system is configured to include, in order from an object side, a first lens group, a stop, and a rear group including at least one cemented lens, and to satisfy all of the following conditional expressions: 0 . 3 ? 5 < Bf / y < 0 .70 1.35 < TL / y < 1.85 where Bf is a back focus in air-equivalent length, and y is a maximum image height. Further, an optical system is configured to include, in order from an object side, a first lens group, a stop, and a rear group having an air gap between a lens disposed closest to an image-plane side of one or more lenses included in the first lens group and the stop, and to satisfy the following conditional expression: 1.35 < TL / y < 1.85 where TL is the distance from a lens surface closest to the object side to an image plane at focusing on an object at infinity, and y is a maximum image height.

Abstract: There are provided an optical system having high resolution and high optical performance and reduced in size, an optical apparatus including the optical system, an imaging apparatus, and a method for manufacturing the optical system and imaging apparatus. An optical system UL of a camera module 10, which is incorporated in an optical apparatus, such as a camera 60, is an optical system that forms an image of an object, includes a correction member having a correction surface 11a, a first reflection surface 12a, which reflects light having passed through the correction surface 11a, and a second reflection surface 13a, which reflects the light reflected off the first reflection surface 12a, and satisfies predetermined conditions.

Abstract: An optical system (LS) includes lenses (L22,L23) satisfying the following conditional expressions, ndLZ+(0.01425×?dLZ)<2.12, and ?dLZ<35.0, where ndLZ: a refractive index of the lens with reference to d-line, and ?dLZ: Abbe number of the lens with reference to d-line.

Abstract: Comprising, in order from an object side: a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having positive refractive power, and a fifth lens group having negative refractive power; upon varying a magnification, the first lens group being fixed with respect to the image plane, and each distance between the neighboring lens groups being varied; upon focusing, at least a portion of the fourth lens group being moved; and predetermined conditional expression(s) being satisfied, thereby variations in various aberrations upon varying magnification being superbly suppressed.

Abstract: A zoom optical system includes a positive first lens group, a negative second lens group disposed on an image side of the first lens group, a positive third lens group disposed on an image side of the second lens group, a negative fourth lens group disposed on an image side of the third lens group, and a final lens group disposed on an image side of the fourth lens group and closest to an image. During zooming, distances between lens groups change, and the first lens group moves along an optical axis. A negative focusing lens group is provided, and the final lens group is disposed on an image side of the focusing lens group. A negative vibration proof group of the second lens group may include, in order from an object, a negative lens, an air gap and a cemented lens of a negative lens and a positive lens. The final lens group may have negative refractive power.

Abstract: Comprising, in order from an object side: a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having positive refractive power, and a fifth lens group having negative refractive power; upon varying a magnification, the first lens group being fixed with respect to the image plane, and each distance between the neighboring lens groups being varied; upon focusing, at least a portion of the fourth lens group being moved; and predetermined conditional expression(s) being satisfied, thereby variations in various aberrations upon varying magnification being superbly suppressed.

Abstract: An optical system (LS) includes lenses (L22,L23) satisfying the following conditional expressions, ?dLZ<35.0, and 0.702<?gFLZ+(0.00316×?dLZ), where ?dLZ: Abbe number of the lens with reference to d-line, and ?gFLZ: a partial dispersion ratio of the lens, wherein ?gFLZ is defined by the following expression, ?gFLZ=(ngLZ?nFLZ)/(nFLZ?nCLZ). wherein a refractive index of the lens with reference to g-line is ngLZ, a refractive index of the lens with reference to F-line is nFLZ, and a refractive index of the lens with reference to C-line is nCLZ.

Abstract: An optical system (LS) Includes lenses (L22,L23) satisfying the following conditional expressions, ?dLZ<35.0, and 0.702<?gFLZ+(0.00316×?dLZ), where ?dLZ: Abbe number of the lens with reference to d-line, and ?gFLZ: a partial dispersion ratio of the lens, wherein ?gFLZ is defined by the following expression, ?gFLZ?(ngLZ?nFLZ)/(nFLZ?nCLZ). wherein a refractive index of the lens with reference to g-line is ngLZ, a refractive index of the lens with reference to F-line is nFLZ, and a refractive index of the lens with reference to C-line is nCLZ.

Abstract: The present application provides a method of controlling an EV charger which is located at a charging site by a controller. The controller provides a charging signal thereto for controlling the EV charger to operate within a threshold power that is allowable at a management site. The method comprising receiving a consumption power reading used in the management site, and controlling a charging power to the EV charger so that the consumption power is less than the maximum consumption power.

Abstract: An optical system is configured to include a plurality of lenses such that a final lens closest to an image side of the lenses includes a lens surface having a pole and that the following conditional expression is satisfied: 0.20<k/h<0.50, where k is the height of the pole from an optical axis, and h is the effective radius of the lens surface having a pole. The optical system can be used for an optical apparatus, such as a camera 1.

Abstract: This work machine is provided with a machine body equipped with a battery storage part for accommodating a battery. The machine body has a grip part on one side in the left-right direction. The battery storage part has an opening formed in the machine body and a lid capable of opening and closing the opening. The opening and the lid are provided on the other side of the machine body in the left-right direction.

Abstract: A zoom optical system includes, in order from an object, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power. The first lens group moves toward an object and air distances between the first to the third lens groups are varied upon zooming from a wide-angle end state to a tele-photo end state. The first lens group comprises a cemented lens consisting of a negative lens and a positive lens in order from the object. The following conditional expressions are satisfied: 4.40<f1/(?f2)<8.00 0.60<f3/fw<3.50 0.60<(?f2)/f3<1.05 30.00°<?w<80.

Abstract: An optical system (LS) has an aperture stop (S), and a positive lens (L4) disposed closer to the object side than the aperture stop (S). The positive lens (L4) satisfies the following conditional expressions. ?0.010<ndP1?(2.015?0.0068×?dP1) 50.00<?dP1<65.00 0.545<?gFP1 ?0.010<?gFP1?(0.6418?0.00168×?dP1) where ndP1 is the refractive index to the d line of the positive lens, ?dP1 is the Abbe number with respect to the d line of the positive lens, and ?gFP1 is the partial dispersion ratio of the positive lens.