Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, sequentially disposed from an object side to an imaging plane. The optical imaging system satisfies the expression BFL/f<0.15, where BFL represents a distance from an image-side surface of the eighth lens to an imaging plane of an image sensor and f represents an overall focal length of the optical imaging system.

Abstract: The present disclosure discloses a zoom lens assembly. The zoom lens assembly comprises, sequentially along an optical axis from an object side to an image side, a first lens group comprising a first lens and a second lens; a second lens group having a positive refractive power and comprising a third lens, a fourth lens and a fifth lens; a third lens group having a negative refractive power and comprising a sixth lens; and a fourth lens group having a positive refractive power and comprising a seventh lens and an eighth lens. At least one of the first lens to the eighth lens is an aspheric lens. By changing positions of at least two lens groups in the second lens group, the third lens group and the fourth lens group on the optical axis, the zoom lens assembly switches between a wide-angle state and a telephoto state, and a focal length of the zoom lens assembly changes linearly when the zoom lens assembly switches from the wide-angle state to the telephoto state.

Abstract: A variable magnification optical system consists of, in order from an object side to an image side, a first lens group, a second lens group, and a subsequent lens group. The variable magnification optical system satisfies a predetermined conditional expression for a partial dispersion ratio related to F line, C line, and a wavelength of 1970.09 nm, a d-line back focus of the variable magnification optical system at a telephoto end, a back focus in any one wavelength from a wavelength of 1300 nm to a wavelength of 2325.42 nm at the telephoto end, and a d-line focal length of the variable magnification optical system at the telephoto end.

Abstract: A variable magnification optical system 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, and a rear lens group having positive refractive power; upon varying a magnification, a distance between the first lens group and the second lens group being varied, a distance between the second lens group and the third lens group being varied, and a distance between the third lens group and the rear lens group being varied; the rear lens group comprising a focusing lens group which is moved upon carrying out focusing from an infinitely distant object to a closely distant object; and predetermined conditional expression(s) being satisfied, thereby various aberrations being corrected superbly.

Abstract: An imaging lens consisting of, in order from an object side to an image side: a first lens group; a second lens group that has a positive refractive power; and a third lens group that has a negative refractive power, wherein the first lens group includes, successively in order from a position closest to the object side to the image side, two negative lenses and a positive lens, the second lens group includes a positive lens and a negative lens, during focusing from an object at infinity to a closest object, the first lens group remains stationary with respect to an image plane, and the second lens group moves along an optical axis, and assuming that a focal length of the first lens group is f1, and a focal length of the second lens group is f2, Conditional Expression (1) is satisfied: ?0.5<f2/f1<0.5 (1).

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 lens system includes: a first lens group having positive power; a second lens group having negative power; a third lens group having positive power; a fourth lens group having negative power; and a fifth lens group having positive power. The first lens group is made up of a single lens. The second lens group is made up of four lenses. The zoom lens system is configured to zoom from a wide-angle end toward a telephoto end such that the fifth lens group does not move but the first to fourth lens groups move to change intervals between the lens groups.

Abstract: A variable magnification optical system 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, and a rear lens group having positive refractive power; upon varying a magnification, a distance between the first lens group and the second lens group being varied, a distance between the second lens group and the third lens group being varied, and a distance between the third lens group and the rear lens group being varied; the rear lens group comprising a focusing lens group which is moved upon carrying out focusing from an infinitely distant object to a closely distant object; and predetermined conditional expression(s) being satisfied, thereby various aberrations being corrected superbly.

Abstract: The disclosure provides a zoom lens assembly, which sequentially includes from an object side to an image side along an optical axis: a first lens group; a second lens group with a positive refractive power, spaced from the first lens group by a first air space and movable on the optical axis; a third lens group with a positive refractive power, spaced from the second lens group by a second air space and movable on the optical axis; and a fourth lens group, spaced from the third lens group by a third air space; wherein a Total Track Length (TTL) of the zoom lens assembly and a difference ?f between an effective focal length of the zoom lens assembly at a wide end and an effective focal length of the zoom lens assembly at a tele end satisfy 2.5<TTL/|?f|<4.0.

Abstract: An imaging lens comprises in order from an object, a first lens group of positive refractive power, a second lens group of positive refractive power, and a third lens group of negative refractive power. In focusing from infinity to a close object, the first lens group is fixed in position, and the second lens group and the third lens group are moved so that the distance between the first lens group and the second lens group is reduced, and the distance between the second lens group and the third lens group is increased. Further, the following conditional expression (1) is satisfied: 1.0<f1/f<2.5??(1) where f1: is the focal length of the first lens group, and f: the focal length of the entire system.

Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, sequentially disposed from an object side to an imaging plane. The optical imaging system satisfies the expression BFL/f<0.15, where BFL represents a distance from an image-side surface of the eighth lens to an imaging plane of an image sensor and f represents an overall focal length of the optical imaging system.

Abstract: A projection system includes a first optical system including a plurality of lenses and a deflector, and a second optical system including an optical element having a concave reflection surface and disposed at the enlargement side of the first optical system. The deflector is disposed in one air gap of a plurality of air gaps provided between the lenses adjacent to each other in the first optical system, the air gap having the largest axial inter-surface distance in the first optical system. The first optical system includes a first section located at the reduction side of the deflector and a second section located at the enlargement side of the deflector. A first optical axis section of the first section and a second optical axis section of the second section intersect each other. The second section includes three or more lenses. The second section is shorter than the first section.

Abstract: A reversal system for an endoscope, the reversal system including: first and second outer achromats each comprising at least two lenses, wherein the first and second outer achromats have an outer diameter; first and second inner achromats arranged between the first and second outer achromats, wherein each of the first and second inner achromats comprises at least two lenses; and a holding sleeve for accommodating the at least two lenses of one or more of the first and second inner achromats, wherein the holding sleeve with the at least one of the first and second inner achromats is arranged between the first and second outer achromats.

Abstract: The present disclosure relates to an optical lens, in particular to a camera optical lens. The camera optical lens includes, from an object side to an image side in sequence: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, the second lens has a negative refractive power, and the third lens has a negative refractive power, and the camera optical lens satisfies the following conditions: 3.00?f1/f?6.00, and ?14.00?R7/d7??5.00, where f denotes a focal length of the camera optical lens, f1 denotes a focal length of the first lens, R7 denotes a curvature radius of an object-side surface of the fourth lens, d7 denotes an on-axis thickness of the fourth lens. The camera optical lens can obtain high imaging performance and a low TTL.

Abstract: The disclosure discloses a zoom lens group, which sequentially includes from an object side to an image side along an optical axis: a first lens group having a negative refractive power; a second lens group having a positive refractive power; a third lens group having a refractive power and having a fifth lens and a sixth lens, wherein the fifth lens and the sixth lens are formed into a cemented lens; and a fourth lens group having a refractive power. By adjusting a spacing distance on the optical axis between the first lens group and the second lens group, a spacing distance on the optical axis between the second lens group and the third lens group and a spacing distance on the optical axis between the third lens group and the fourth lens group, the zoom lens group is switched from a long-focus state to a wide-angle state.

Abstract: A three-dimensional printing system includes a build device and an optical projection engine. The build device includes a curing tank, a photocurable material and a build platform, and the photocurable material and the build platform is disposed in the curing tank. The optical projection engine has a zoom lens for projecting image beams with at least a first pixel size and a second pixel size on the build platform to cure the photocurable material, and the first pixel size is different to the second pixel size.

Abstract: The zoom lens includes, in order from object side to image side, a positive first lens unit (LU), a negative second LU, a positive third LU, and a rear lens group including at least one LU. The zoom lens further includes an aperture stop. A LU arranged on image side of aperture stop moves during zooming. The first LU consists of at least two positive lenses (TPL), and two negative lenses (TNL). An average partial dispersion ratio (APDR) of TNL, APDR of TPL having highest refractive powers of at least TPL, an average Abbe number (AAN) of TNL, AAN of TPL, larger one of Abbe numbers of TNL, smaller one of Abbe numbers of TPL, focal lengths of first and second LUs, a distance from an optical surface closest to object side to image plane, and a focal length of zoom lens at a telephoto end are each appropriately set.

Abstract: The zoom lens, in order from the object side, a positive first lens group that does not move during zooming, a negative second lens group that moves during zooming, a negative third lens group that moves during zooming, at least one lens group that moves during zooming, and a rear group that does not move during zooming. All distances between the lens groups adjacent to each other change during zooming. The zoom lens satisfies predetermined conditional expressions.

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, distances between the lens groups change, the subsequent lens group (GR) comprises a focusing lens group that moves upon focusing, and conditional expressions 0.18<(?fF)/f1<0.30, and 0.84<(?f2)/f3<1.20, are satisfied, 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: The optical system according to the present invention consists of a first lens unit with positive refractive power disposed closest to an object side, a middle group including at least two lens units, and a final lens unit with negative refractive power disposed closest to an image side in which intervals between adjacent lens units are changed during focusing. The middle group includes a first focus lens unit configured to move during focusing, and a second focus lens unit disposed on the image side of the first focus lens unit and configured to move during focusing. An aperture stop is disposed between two lenses included in the middle group. Here, a focal length of the optical system, a focal length of the final lens unit, and a focal length of a second focus lens unit are appropriately determined.

Abstract: A variable focal length lens apparatus includes an objective lens and an imaging lens that are aligned on the same optical axis; a front side lens system and a rear side lens system that are disposed in a section between the objective lens and the imaging lens on the optical axis, and change a refractive index in accordance with an input drive signal; and a diaphragm disposed in the section between the front side lens system and the rear side lens system on the optical axis.

Abstract: A variable magnification optical system 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, and a rear lens group having negative refractive power; upon varying a magnification from a wide angle end state to a tele photo end state, a distance between the first lens group and the second lens group being varied, a distance between the second lens group and the third lens group being varied, and a distance between the third lens group and the rear lens group being varied; the third lens group or the rear lens group comprising a focusing lens group which is moved upon carrying out focusing from an infinitely distant object to a closely distant object; and predetermined conditional expression(s) being satisfied, thereby various aberrations being corrected superbly.

Abstract: An electronic notebook system is described that comprises a housing, a computing device, wireless interfaces, antennas, sensors, a touch display configured to receive input via a stylus and/or human digit input, the stylus comprising a pressure and/or an inclination sensor, a microphone, camera, the notebook system configured to provide a user condition interface, receive a user selection of a first user condition, provide an interface configured to receive user details, receive audible user details via the microphone, convert the audible user details received via the microphone to text, perform natural language processing to identify text keywords utilizing sentence segmentation, part-of-speech tagging, paraphrase recognition, and/or co-reference resolution, identify a condition based at least in part on the identified one or more keywords, dynamically generate an alert based at least in part on the identified condition, wirelessly transmit the generated alert to one or more destinations via at least a first

Abstract: A zoom lens comprises, in order from an object: 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) having negative refractive power; and a fifth lens group (G5) having positive refractive power, in which the first to the fifth lens groups (G1 to G5) each move in an optical axis direction upon zooming from a wide angle end state to a telephoto end state, at least a part of the fourth lens group (G4) is configured to serve as a focusing lens group to move in the optical axis direction upon focusing, the first lens group (G1) consists of two lenses, and the following conditional expression is satisfied. 0.30<GD3/ft<0.8 where, GD3 denotes a thickness of the third lens group (G3) on the optical axis, and ft denotes a focal length of the zoom lens in the telephoto end state.

Abstract: A camera lens, e.g., for a full-frame camera, may have a first compound lens leading on the object side, a second compound lens following the first compound lens, a third compound lens that terminates on the sensor side and follows the second compound lens, and an aperture stop arranged between the first compound lens and the second compound lens. The first compound lens may have a converging refractive power. The second compound lens may comprise at least two lens elements arranged movably along the optical axis, and the third compound lens may have at least one aspheric lens element which is fixedly arranged in the longitudinal direction of the optical axis, wherein the aspheric lens element has a diameter of at least 25 mm.

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: Provided is a zoom lens including in order from an object side: a positive first lens unit not moving for a change in magnification; a negative second lens unit moving for a change in magnification; and two or three rear lens units having a positive refractive power as a whole, at least one of the rear lens units being configured to move for a change in magnification. The first lens unit includes a negative first lens sub-unit not moving for focusing, a positive second lens sub-unit moving for focusing, a third lens sub-unit not moving for focusing, and a positive fourth lens sub-unit moving for focusing. An amount of movement of the second lens sub-unit during focusing from infinity to a minimum object distance, and an amount of movement of the fourth lens sub-unit during focusing from infinity to the minimum object distance satisfy a specific conditional expression.

Abstract: An optical system including a first lens element having an optical center, a second lens element having an optical center spaced apart from the first lens element and oriented such that a beam passing through the optical center of said first lens element will also pass straight the optical center of the second lens element, the beam defining an optical path; and at least one planar, optical slab configured to be movable between at least two positions, a first position wherein at least a portion of a planar surface of the optical slab is disposed between the first and second lens elements such that a beam transmitted therethrough also passes through the planar, optical slab and a second position wherein the planar, optical slab is fully outside of the optical path created by the first and second lens elements.

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: To attain the above-described objective, a zoom lens according to the present invention includes sequentially from an object side, a front group which includes at least three lens groups and has positive refractive power as a whole, and a lens group disposed on an image side of the front group, a magnification is changed by a change of a distance on an optical axis between adjacent lens groups, the lens group includes sequentially from an image side, a lens component, a lens component, and a lens component, the lens group is moved to an object side at a time of changing a magnification from a wide-angle end to a telephoto end, focusing is obtained by movement of a part of lens groups in the front group along an optical axis, and a predetermined condition expression is satisfied.

Abstract: An image capture assembly includes a heat-conducting housing, a camera component in the heat-conducting housing, and a heat-conducting sheet. The heat-conducting sheet is attached to the camera component and arranged between the camera component and the heat-conducting housing to dissipate heat generated by the camera component to the heat-conducting housing. The heat-conducting sheet extends to a side wall of the camera component from a bottom side of the camera component.

Abstract: An optical imaging system includes a first lens group that can move in an optical direction and has negative refractive power; a second lens group that can move in the optical direction and has positive refractive power; and a third lens group that can move in the optical direction and has negative refractive power. The first lens group, the second lens group, and the third lens group include seven lenses in total, and at least one of the seven lenses includes an aspherical surface.

Abstract: A lens module includes a carrier having an internal space, a lens unit including a plurality of lens groups and disposed in the carrier so that one or more of the lens groups is movable in a length direction of the carrier, a lens guide unit connected to the one or more movable lens groups to guide movement of the one or more movable lens groups, and a lens driving unit connected to the lens guide unit and including a plurality of driving wires formed of a shape memory alloy. The lens guide unit is moved in a height direction of the carrier by expansion and contraction of the plurality of driving wires to move the one or more lens groups in the length direction of the carrier.

Abstract: A zoom lens consists of, in order from an object, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power. Zooming is performed by changing respective distances between the first and second lens groups, the second and third lens groups, and the third and fourth lens groups. The first lens group consists of, in order from an object, a negative lens, a negative lens and a positive lens, the second lens group consists of five lenses, and the third lens group consists of a bi-concave negative lens.

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 imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed in numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane of the optical imaging system, wherein the optical imaging system satisfies 0.5<L12345TRavg/L7TR<0.9, where L12345TRavg is an average value of overall outer diameters of the first to fifth lenses, L7TR is an overall outer diameter of the seventh lens, and L12345TRavg and L7TR are expressed in a same unit of measurement.

Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed in numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane of the optical imaging system; and a spacer disposed between the sixth and seventh lenses, wherein the optical imaging system satisfies 0.5<S6d/f<1.4, where S6d is an inner diameter of the spacer, f is an overall focal length of the optical imaging system, and S6d and f are expressed in a same unit of measurement.

Abstract: A projection objective, used for projecting an object space to an image space. The objective includes, from the object space along an optical axis in sequence: a first lens set (G1) having positive focal power, a second lens set (G2) having negative focal power, a third lens set (G3) having positive focal power, a fourth lens set (G4) having negative focal power, and a fifth lens set (G5) having positive focal power. Aspheric lenses are provided in the first lens set (G1), the second lens set (G2), the third lens set (G3), the fourth lens set (G4), and the fifth lens set (G5).

Abstract: A refractive projection lens for imaging a pattern in an object plane of the projection lens into an image plane of the projection lens via electromagnetic radiation of a mercury vapor lamp includes a multiplicity of lens elements are arranged along an optical axis between the object and image planes. The lens elements image a pattern in the object plane into the image plane with a reducing imaging scale. The lens elements include first lens elements made of a first material with a relatively low Abbe number and a second lens elements made of a second material with a higher Abbe number relative to the first material.

Abstract: A zoom lens includes, in order from an object along an optical axis: a first lens group having a negative refractive power; a second lens group having a positive refractive power; a third lens group having a negative refractive power; a fourth lens group; and a fifth lens group. When the zoom lens performs varying magnification, the distance between the first and second lens groups changes, the distance between the second and third lens groups changes, the distance between the third and fourth lens groups changes, the distance between the fourth and fifth lens groups changes, the second and fourth lens groups move along the same trajectory along the optical axis, and at least the third lens group moves along the optical axis.

Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, sequentially disposed from an object side to an imaging plane. The optical imaging system satisfies the expression BFL/f<0.15, where BFL represents a distance from an image-side surface of the eighth lens to an imaging plane of an image sensor and f represents an overall focal length of the optical imaging system.

Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens includes a negative refractive power, and the second lens includes a negative refractive power. The third lens includes a positive refractive power, and the fourth lens includes a positive refractive power, an object-side surface thereof being concave. The fifth lens includes a positive refractive power. The sixth lens includes a negative refractive power. The first to sixth lenses are sequentially disposed from an object side toward an imaging plane. One lens of the first to sixth lenses is cemented to a lens adjacent thereto.

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. A following conditional expression is satisfied: 0.20<f1/fR<0.85 where, f1 denotes a focal length of the first lens group, and fR denotes a focal length of a lens component, in the subsequent group, closest to an image surface.

Abstract: The present disclosure discloses an imaging lens assembly. The imaging lens assembly includes, sequentially along an optical axis from an object side to an image side, a first lens, a second lens, a third lens, and a fourth lens. The object-side surface of the first lens is a concave surface, and the image-side surface of the fourth lens is a concave surface. The second lens has a positive refractive power. At least one of the first lens, the third lens, or the fourth lens has a negative refractive power. An effective focal length f3 of the third lens and an effective focal length f4 of the fourth lens satisfy: f3/f4>0.

Abstract: A zoom lens consists of, in order from an object side, a positive first lens group, a negative second lens group, a positive third lens group, a positive fourth lens group, and a positive fifth lens group. During zooming, the first lens group is fixed, and distances between the respective lens groups change in predetermined manners. The first lens group consists of, in order from the object side, a negative lens group fixed during focusing, a positive lens group movable during focusing, and a positive lens group fixed during focusing. The lens group has on the most image side four lenses of, in order from the object side, a positive lens, a cemented lens in which a negative meniscus lens having a convex surface facing the object side and a positive lens are cemented, and a positive meniscus lens having a convex surface facing the object side.

Abstract: A zoom lens according to the disclosure includes a first lens group having positive refractive power, a second lens group, a third lens group, a fourth lens group, a fifth lens group, and a sixth lens group. The first lens group includes a front side first lens group fixed with respect to an image plane upon zooming from a wide end to a telephoto end and focusing from an infinite object to a short-distance object, and a rear side first lens group having positive refractive power. The second, third, and fifth lens groups travel along an optical axis upon zooming. The fourth and sixth lens groups are fixed with respect to the image plane in an optical axis direction upon zooming. At least two lens groups including the rear side first lens group travel along the optical axis upon focusing.

Abstract: A lens barrel including a first lens, an actuator that drives the first lens, a first barrel that holds a first cam follower and the actuator and moves in an optical axis direction, a second lens, and a second barrel that holds a second cam follower and the second lens and moves in the optical axis direction, the second barrel having a first hole portion in which the first cam follower is disposed.

Abstract: The present disclosure discloses a camera optical lens, including, in an order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens is made of glass material, the second lens is made of plastic material, the third lens is made of plastic material, the fourth lens is made of glass material, the fifth lens is made of plastic material, and the sixth lens is made of plastic material. The camera optical lens further satisfies specific conditions.

Abstract: An optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens includes an object-side surface that is convex with a meniscus shape. The second lens includes an image-side surface that is convex. The third lens includes an image-side surface that is concave. The fifth lens includes an image-side surface that is concave. The first to sixth lenses are sequentially disposed from an object side to an image side.

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).