Abstract: An optical imaging system includes a first lens group, a second lens group, and a third lens group, sequentially arranged from an object side, wherein the first lens group includes two lenses having negative and positive refractive power, the second lens group includes a plurality of lenses, and the third lens group includes two lenses having negative and positive refractive power.

Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a plurality of zooming lens units configured to move along an optical axis in zooming and including a lens unit having a negative refractive power, and a final lens unit having a positive refractive power. A distance between each pair of adjacent lens units changes in zooming. The first lens unit includes, in order from the object side to the image side, a first subunit having a negative refractive power, a second subunit having a negative refractive power, and at least one subsequent subunit, a distance between each pair of adjacent subunits changing for focusing. The second subunit is configured to move along the optical axis for focusing. A predetermined condition is satisfied.

Abstract: A zoom lens (ZL) comprises, in order from an object: a first lens group (G1) having negative refractive power; an aperture stop (S); a second lens group (G2) having positive refractive power; a third lens group (G3) having negative refractive power; and a fourth lens group (G4) having positive refractive power. In this zoom lens (ZL), upon zooming from a wide angle end state to a telephoto end state, a distance between the aperture stop (S) and the first lens group (G1), a distance between the aperture stop (S) and the second lens group (G2), and a distance between the aperture stop (S) and the third lens group (G3) are changed and the aperture stop (S) is moved in an optical axis direction.

Abstract: An optical imaging lens assembly is provided. The optical imaging lens assembly includes, sequentially from an object side to an image side along an optical axis, a first lens having negative refractive power with a concave object-side surface and a concave image-side surface; a second lens having refractive power; a third lens having negative refractive power; a fourth lens having refractive power; a fifth lens having refractive power; a sixth lens having refractive power with a concave object-side surface and a concave image-side surface; a seventh lens having refractive power; and an eighth lens having refractive power.

Abstract: The disclosure provides a zoom lens group, which sequentially includes, from an object side to an image side along an optical axis: a first lens group with negative refractive power, including a first lens and a second lens, wherein the first lens has negative refractive power, and an object-side surface thereof is a concave surface; a second lens group with positive refractive power; a third lens group with positive refractive power; and a fourth lens group with negative refractive power. A spacing distance of the first lens group and the second lens group on an optical axis, a spacing distance of the second lens group and the third lens group on the optical axis and a spacing distance of the third lens group and the fourth lens group on the optical axis are changed to switch the zoom lens group from a telephoto state to a wide-angle state.

Abstract: The present disclosure discloses an optical imaging lens assembly. The optical imaging lens assembly includes, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has a positive refractive power, and an object-side surface thereof is a convex surface; the second lens has a negative refractive power, and an image-side surface thereof is a concave surface; each of the third lens, the fourth lens, the fifth lens and the sixth lens have a positive refractive power or a negative refractive power; the seventh lens has a negative refractive power, and an object-side surface thereof is a concave surface. A total effective focal length f of the optical imaging lens assembly and an effective focal length f1 of the first lens satisfy f/f1?2.0.

Abstract: An imaging device includes: a plurality of optical systems each forming an image of a subject; a plurality of imaging sensors corresponding to the respective plurality of optical systems; and a housing part that houses the plurality of optical systems and the plurality of imaging sensors, the housing part having a peripheral surface along a circumferential direction about a reference axis, wherein: at least two of the plurality of optical systems each have: a peripheral lens arranged along the peripheral surface and located closest to an object; and a first optical path, the first optical paths of the at least two optical systems intersecting each other; and each of the peripheral lenses has a longitudinal direction, the peripheral lens being arranged along the peripheral surface such that the longitudinal direction extends along the reference axis.

Abstract: A zoom optical system includes a first lens group, a position of which with respect to an imaging plane is adjustable, and including first and second lenses. The zoom optical system also includes a second lens group of which a position with respect to the imaging plane is adjustable and includes third to fifth lenses. The zoom optical system further includes a third lens group including a sixth lens. An object-side surface of the first lens is convex.

Abstract: A zoom optical system consists of a first lens group having negative refractive power, a second lens group having positive refractive power, and a rear lens group which are disposed in order from an object. The rear lens group comprises a last lens group and an F lens group in order from a side closest to an image. Lens groups forming the first lens group, the second lens group, and the rear lens group are configured in such a manner that, upon zooming, the respective lens groups move and a distance between the lens groups adjacent to each other changes. At least a part of the F lens group is configured to move upon focusing. Further, the following conditional expression is satisfied. ?0.220<f1/fE<0.

Abstract: An imaging optical system includes lens group Gm located on that is closest to an object among lens groups in which a distance between the lens groups changes during zooming, the lens groups having negative power. Lens group Gm includes, in order from the object side toward an image side, lens element LGmF1 having the negative power, lens element LGmF2 having the negative power, both surfaces of lens element LGmF2 having an aspherical shape, and at least two lens elements having power. The present disclosure provides the imaging optical system having good various aberrations such as spherical aberration, astigmatism, and distortion and an imaging device and a camera system that are provided with the imaging optical system.

Abstract: A zoom projection lens with eleven lens elements is provided. The zoom projection lens sequentially includes a first lens group, a second lens group, a third lens group, an aperture stop, a fourth lens group and a fifth lens group along an optical axis from a screen side to an image source side. The first lens group has a negative refractive power and includes three lens elements. The second lens group has a positive refractive power and includes one lens element. The third lens group has a positive refractive power and includes one lens element. The fourth lens group has a negative refractive power and includes four lens elements. The fifth lens group has a positive refractive power and includes two lens elements. A first lens element in the first lens group is an aspheric lens made of plastic.

Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, and a rear group having a positive refractive power as a whole including at least one lens unit. During zooming from a wide-angle end to a telephoto end, a distance between adjacent lens units changes. The first lens unit includes at least three negative single lenses, and a predetermined condition is satisfied.

Abstract: The disclosure proposes a projection lens including a first lens group, a second lens group and a third lens group arranged in sequence along an optical axis from a magnification side to a reduction side. The first lens group includes a plurality of lenses having refractive power. The second lens group includes at least one lens having refractive power. The third lens group includes a diaphragm, and a plurality of lenses having refractive power, wherein an intermediate image is formed between the first and third lens groups, and the refractive powers of the first, second and third lens groups are positive, positive, and positive, respectively. A projection device including the above projection lens is also proposed.

Abstract: A variable magnification optical system includes, in order from an object: a first lens group (G1) having a negative refractive power; a second lens group (G2) having a positive refractive power; a third lens group (G3) having a negative refractive power; and a fourth lens group (G4) having a positive refractive power. The system performs varying magnification by changing the distance between the first lens group and the second lens group, the distance between the second lens group and the third lens group, and the distance between the third lens group and the fourth lens group. The third lens group includes a 32nd lens group (G32) configured to be movable so as to have a component in a direction orthogonal to an optical axis in order to correct image blur as a vibration-reduction lens group (VR) and a 31st lens group (G31) disposed at an object-side of the 32nd lens group. The 32nd lens group has negative refractive power, and the system satisfies Conditional Expression (1) below. 0.200<f1/f3<0.

Abstract: A lens system includes, in order from an object side to an image plane side: a first lens element having a negative power; a second lens element whose concave surface faces the object side; and a third lens element having a positive power, and satisfies conditions (1) and (2). 0.205<|(TL1/TA)·tan(?)|??(1) 0.120<IH/TA<0.170??(2) where TL1 is a central thickness of the first lens element, TA is a total optical length, ? is a half angle of view, and IH is an image height of the lens system.

Abstract: Provided is a zoom lens including a plurality of lens units, in which an interval between each pair of adjacent lens units is changed for zooming. The plurality of lens units consist of, in order from an object side to an image side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; and a rear lens group including at least two lens units. The first lens unit and the second lens unit are configured to move during zooming. The first lens unit includes, in order from the object side to the image side, a negative lens G1, a negative lens G2, and a negative lens G3.

Abstract: An optical assembly for a point action camera with a wide field of view has multiple lens elements configured to provide a field of view in excess of 150 degrees. One or more lens elements has an aspheric surface with an approximately 30 microns or less sag and an approximately 25 microns/millimeter or less aspheric sag slope.

Abstract: The zoom lens according to the present invention includes, in order from an object side to an image side, a first lens unit with a negative refractive power and a rear lens group including one or more lens units, in which intervals between adjacent ones of the lens units are changed during zooming and focusing. The first lens unit includes three or more negative lenses. The rear lens group includes a focus lens unit with a negative refractive power that moves during focusing. A focal length of the first lens unit, a shortest focal length of the zoom lens, curvature radii of object-side and image-side lens surfaces of a lens in the first lens unit disposed closest to the object side, and a focal length of the focus lens unit are appropriately set.

Abstract: A photographing optical lens assembly includes eight lens elements, the eight lens elements being, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element. Each of the eight lens elements has an object-side surface facing towards the object side and an image-side surface facing towards the image side. At least one surface of the object-side surface and the image-side surface of at least one lens element of the photographing optical lens assembly is aspheric and includes at least one inflection point.

Abstract: Provided is an optical system including, in order from object side to image side, a positive first lens unit (LU), a positive second LU and a third LU, in which intervals between adjacent LUs are changed during focusing. The second LU moves toward object side during focusing from infinity to the closest distance. In order from object side to image side, second LU includes at least one positive lens, a negative lens Ln having a meniscus shape that is concave toward image side, an aperture stop, and a cemented lens consisting of a plurality of lenses and an optical element Gp cemented to one another and having a concave lens surface on object side, then third LU includes a positive lens and a negative lens. A refractive index of a material of Ln with respect to d-line and a partial dispersion characteristic of a material of Gp are appropriately set.

Abstract: A doorbell system may project an illumination on a surface. The doorbell may include a housing, a button, a camera, a microphone, a speaker, a motion detector, and a light source. In some embodiments, the doorbell includes at least one lens coupled to a bottom surface of the housing adjacent the light source. The at least one lens may be configured to allow light from the light source to pass through the at least one lens such that when the electronic doorbell is attached to a building the light source projects an illumination onto a ground surface in front of the doorbell.

Abstract: A projection lens structure mainly includes a first group of lenses with a negative dioptric value, a second group of lenses with a positive dioptric value, a third group of lenses with a positive dioptric value and a fourth group of lenses with a negative dioptric value. The first group of lenses further includes at least a first lens and a second lens, of which the first lens ha a plastic aspheric lens in a meniscus shape with a focal length between ?25˜?80 mm. The second group of lenses further includes at least a third lens. The third group of lenses further includes at least a first doublet with a focal length between 25˜80 mm. The fourth group of length further includes at least a group of doublets, a fourth lens and a fifth lens.

Abstract: The present disclosure discloses an optical imaging system. The optical imaging system includes, sequentially from an object side to an image side, a first lens having a negative refractive power; a second lens having a refractive power; a third lens having a negative refractive power; a fourth lens having a refractive power; a fifth lens having a refractive power; a sixth lens having a refractive power; and a seventh lens having a refractive power. There is an air spacing on an optical axis between any two adjacent lenses in the first to seventh lenses. An effective focal length f of the optical imaging system and an entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD?2.10. The effective focal length f of the optical imaging system and an effective focal length f1 of the first lens satisfy: f1/f>?3.

Abstract: A wide-angle imaging lens including a first lens element, a second lens element, an aperture, a third lens element, a fourth lens element and a fifth lens element arranged in sequence from an object side to an image side along an optical axis is provided. The refractive powers of the first to the fifth lens elements are negative, positive, positive, and negative.

Abstract: A wide-angle lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in order from an object side to an image side along an optical axis. The first lens has negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The second lens has negative refractive power. The third lens has refractive power and includes a convex surface facing the image side. The fourth lens has positive refractive power and includes a convex surface facing the object side. The fifth lens has refractive power. The sixth lens has refractive power and includes a concave surface facing the object side. The seventh lens has positive refractive power. The eighth lens is a biconvex lens with positive refractive power. The ninth lens has negative refractive power. The tenth lens has refractive power and includes a convex surface facing the image side.

Abstract: An optical lens includes a first lens group and a second lens group arranged in order from a first side to a second side, and an aperture stop disposed between the first lens group and the second lens group. The optical lens satisfies the condition of LT/IMH<4.7, where IMH is semi-diagonal image height on an image plane, and LT is a distance along an optical axis between a surface of a first lens of the first lens group facing the first side and a surface of a last lens of the second lens group facing the second side. The first lens is closest to the first side among the first lens group, and the last lens is closest to the second side among the second lens group.

Abstract: A zoom lens includes in order from an object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power. At the time of zooming, distances between lenses vary. A distance between the first lens unit and the second lens unit becomes smaller at a telephoto end than at a wide angle end, and a distance between the second lens unit and the third lens unit becomes longer at the telephoto end than at the wide angle end, and the following conditional expressions (1), (2), and (3) are satisfied: 0.4<|f1|/|f2|<1.2??(1) 0.3<L2/L1<0.95??(2) 0.6<Lt/Lw<1??(3).

Abstract: An image sensor is provided. The image sensor includes a visible light receiving portion and an infrared receiving portion. The visible light receiving portion is configured to receive a visible light. The infrared receiving portion is configured to receive infrared. The visible light receiving portion includes an infrared cutoff filter ball layer configured to collect the visible light. In some embodiments of the present invention, the infrared receiving portion includes a micro-lens layer configured to collect the infrared. In some other embodiments of the present invention, the infrared receiving portion includes an infrared pass filter ball layer configured to collect the infrared.

Abstract: Provided is a zoom lens including, in order from an object side to an image side: a first lens unit having a negative refractive power and configured not to move for zooming; a second lens unit having a positive refractive power and configured to move to an object side for zooming from a wide angle end to a telephoto end; and a rear lens unit arranged closest to the image side, wherein the rear lens unit includes an optical element having a positive refractive power and cemented with a lens made of a glass material, and wherein the optical element satisfies the following conditions: ?2.100×10?3×?dm+0.693<?gFm; and 0.555<?gFm<0.900, where ?dm and ?gFm are expressed by the following expressions: ?dm=(Nd?1)/(NF?NC); and ?gFm=(Ng?NF)/(NF?NC), where Ng, NF, Nd and NC respectively represent refractive indices with respect to a g-line, an F-line, a d-line, and C-line.

Abstract: An image pickup apparatus includes an optical system which includes a plurality of lenses, and an image sensor which is disposed at an image position of the optical system, wherein the optical system includes in order from an object side, a first lens having a negative refractive power, an aperture stop, a second lens having a positive refractive power, and a third lens, and an object-side surface of the third lens has a shape which his concave toward the object side, and each of the first lens, the second lens, and the third lens is formed of a material having a refractive index not higher than 1.70, and the following conditional expression (1) is satisfied: 0.5<?1L/IH<3.0??(1), where, IH denotes a maximum image height, and ?1L denotes an effective aperture at an object-side surface of the first lens.

Abstract: An imaging lens includes a first lens group and a second lens group, arranged in this order from an object side to an image plane side. The first lens group includes a first lens, a second lens, and a third lens. The second lens group includes a fourth lens, a fifth lens, and a sixth lens. The second lens has a convex surface facing the image plane side near an optical axis thereof. The fifth lens has a concave surface facing the image plane side near an optical axis thereof. The sixth lens has a concave surface facing the object side near an optical axis thereof. The fifth lens has refractive power weaker than those of the fourth lens and the sixth lens. The second lens has a specific Abbe's number.

Abstract: A zoom lens of the present invention is a zoom lens including a variable stop whose aperture diameter is variable in zooming, the variable stop is a stop which determines a minimum f-number of the zoom lens at least at one of zoom positions in an entire zoom range, and the aperture diameter of the variable stop is variable in focusing at least at a telephoto end in the entire zoom range.

Abstract: A zoom lens system for providing high quality images with higher resolution includes a first lens group (110), an aperture stop (120), and a second lens group (130). The first lens group has a positive or negative refractive power, and includes at least two lens elements having a negative refractive power and at least on lens element having a positive refractive power. The second lens group has a positive refractive power. A distance between a first and second lens group is not fixed.

Abstract: A variable magnification optical system includes: a first lens group (G1) having a negative refractive power; a second lens group (G2) having a positive refractive power; an intermediate group (Gn) disposed closer to an image side than the second lens group (G2); and a vibration-reduction lens group (VR) disposed closer to the image side than the intermediate group (Gn) and configured to be movable so as to have a component in a direction orthogonal to an optical axis. The system performs varying magnification by changing at least the distance between the first lens group (G1) and the second lens group (G2) and the distance between the second lens group (G2) and the intermediate group (Gn), and the system satisfies Conditional Expression (1). 1.500<?(Gn)t<100.000??(1) where ?(Gn)t: an imaging magnification of the intermediate group (Gn) in a telephoto end state.

Abstract: Providing a zoom lens system having excellent optical performance with a high zoom ratio, an imaging apparatus, and a method for zooming the zoom lens system. The system including, in order from an object, a first group G1 having negative refractive power, a second group G2 having positive refractive power, a third group G3 having negative refractive power, and a fourth group G4 having positive refractive power. An aperture stop S is disposed between the second group G2 and the fourth group G4. Upon zooming from a wide-angle end state to a telephoto end state, each group is moved such that a distance between the second group G2 and the third group G3 increases, a distance between the third group G3 and the fourth group G4 decreases, and the aperture stop S is moved together with the third group G3. Given conditions are satisfied.

Abstract: The imaging lens includes, in order from the object side, a first lens group that remains stationary during focusing; a diaphragm; and a positive second lens group that moves to the object side during focusing from a long range to a close range. The second lens group includes a positive Z lens that is formed continuously in order from a most image side, a negative Y lens that has an absolute value of a radius of curvature of an object side surface smaller than an absolute value of a radius of curvature of an image side surface, a positive X lens, and a negative W lens that has an absolute value of a radius of curvature of an image side surface smaller than that of an object side surface. The imaging lens satisfies a conditional expression about of the radii of curvature of the X lens and the W lens.

Abstract: An imaging optical system of the present invention includes first and second optical elements arranged in order from an object side and an aperture stop. Each of the first and second optical elements includes an aspherical surface which is rotationally asymmetric with respect to an optical axis. A curvature of the aspherical surface in a first cross section including the optical axis changes from the optical axis in a first direction perpendicular to the first cross section. A total length of the imaging optical system, a distance between the aspherical surface closest to the object side and the aperture stop, and Abbe numbers of the first and second optical elements are appropriately set.

Abstract: The zoom lens according to the present invention includes, in order from an object side to an image side, a negative first lens unit, an aperture stop, a positive second lens unit, and a positive rear lens group. The rear lens group includes a negative lens unit LN and a positive lens unit LP. During zooming, the first lens unit does not move, the second lens unit moves so as to be closer to object side at a telephoto end (TE) than at a wide-angle end (WE), the lens unit LP moves so as to be closer to image side at TE than at WE, and an interval between every adjacent two of lens units changes. Focal lengths of second lens unit and lens unit LP, and an amount by which each of second lens unit and lens unit LP moves for zooming from WE to TE are appropriately set.

Abstract: An imaging lens system includes first and second lens groups each having a positive optical power (P1, P2) and a third lens group. During focusing, the second lens group moves. When the first lens group is divided into two groups across, as a boundary, the longest aerial distance (t1) among the axial lens-to-lens distances located on the image side of the position of half the total length of the first lens group, the object-side group being a front group and the image-side group being a rear group, the most image-side surface in the front group and the most image-side surface in the rear group are lens surfaces concave to the image side. The conditional formulae 0.2<P1/P<0.6, 0.3<P1/P2<0.9, 0.03<t1/t<0.1, and 0.05<t2/t<0.14 are fulfilled (P, the optical power of the entire system; t2, the aerial distance between the first and second lens groups in the infinity-object-distance condition; t, the total length of the system.

Abstract: The imaging lens consists of a positive first lens group remaining stationary during focusing, a negative second lens group, a positive third lens group, and a negative fourth lens group remaining stationary during focusing, in order from an object side. During focusing from the infinite object to the closest object, the second lens group moves to an image side, the third lens group moves to the object side, and the fourth lens group consists of a fourth-a lens group which is a vibration-proof lens group and a fourth-b lens group, in order from the object side. In the imaging lens, predetermined conditional expressions are satisfied.

Abstract: The zoom lens (1) includes an aperture stop (ST1), at least three front side movable lens units (B2 to B4) disposed on an enlargement conjugate side further than the aperture stop and movable for zooming, and a front side fixed lens unit (B1) disposed on the enlargement conjugate side further than the at least three front side movable lens units and fixed for the zooming. The at least three front side movable lens units include two first front side movable lens units (B2 and B3) movable to the enlargement conjugate side for zooming from a wide-angle end to a telephoto end, and a second front side movable lens unit (B4) disposed on the reduction conjugate side further than the first front side movable lens units and movable to the reduction conjugate side for the zooming from the wide-angle end to the telephoto end.

Abstract: An optical imaging system includes a first lens group having a first group of lenses. A foremost lens of the first group of lenses is a lens closest to an object side and has a positive refractive power. The optical imaging system also includes a second lens group having a second group of lenses. A rearmost lens of the second group of lenses is a lens closest to an imaging plane and has convex surfaces. The first and second lens groups are sequentially disposed from the object side to an imaging plane. An expression TL/f1<2.0 is satisfied, where TL represents a distance from an object-side surface of the foremost lens to the imaging plane and f1 represents a focal length of the foremost lens.

Abstract: A five-piece wide-angle lens module includes, from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has negative power, a convex surface on the object side and a concave surface on the image side. The second lens, the third lens and the fifth lens all have positive power and two convex surfaces on both sides. The fourth lens has negative power and two concave surfaces on both sides. The five-piece wide-angle lens module further satisfies the following relationship: 30?(T5+T7+T9)/(T6+T8+T10)?10. Thereby, the incident light can have smaller refraction angle when transmitting through the lenses, and thus the five-piece wide-angle lens module can be provided with characteristics of low manufacturing sensitivity, wide angle, low distortion, high photosensitivity efficiency and high image quality.

Abstract: An optical lens includes a first lens group with negative refractive power, a second lens group with positive refractive power, and an aperture stop disposed between the first lens group and the second lens group. A number of lenses with refractive power of the first lens group is smaller than three, and a number of lenses with refractive power of the second lens group is smaller than five. The second lens group has a lens with a diffractive optical surface, and the lens with a diffractive optical surface satisfies the condition: 0<|(?d*V)/?r|<2, where ?d denotes refractive power of the diffractive optical surface, ?r denotes refractive power of the lens, and V denotes an Abbe number of the lens with a diffractive optical surface.

Abstract: A zoom lens includes in order from an object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a negative refractive power, and at the time of zooming, movement of the first lens unit includes at least a movement toward an image side, the second lens unit moves integrally with an aperture stop, and the third lens unit moves toward the object side, and the first lens unit includes at least a negative lens and a positive lens, and the negative lens is disposed nearest to an object, and the following conditional expressions are satisfied: 0.75<(?2t/?2w)/(?3t/?3w)<1.38 ?0.70<?2w<?0.32 0.96<f2/fw<1.80.

Abstract: The zoom lens consists of, in order from the object side, a first lens group that has a positive refractive power and remains stationary during zooming, a plurality of movable lens groups that move during zooming, and a final lens group that has a positive refractive power and remains stationary during zooming. The first lens group consists of, in order from the object side, a first lens group front group that has a negative refractive power and remains stationary during focusing, a first lens group intermediate group that has a positive refractive power and moves during focusing, and a first lens group rear group that has a positive refractive power. The first lens group front group has, successively in order from a position closest to the object side, a negative meniscus lens that is concave toward the image side and a negative lens.

Abstract: First through third lens groups constituting a projection zoom lens can be configured as a zoom lens of the type in which the first and second lens groups, for example, are moved when zooming, and the first lens group, for example, is moved when focusing. Further, by fulfilling the conditional formula (1), it is possible to achieve that the back focus is prevented from becoming too short, and the back focus is prevented from becoming too long while ensuring the sufficient space on the reduction side, and the lens diameter on the reduction side is prevented from becoming too large in the case of adopting a roughly telecentric configuration on the reduction side.

Abstract: The zoom lens consists of, in order from the object side, a first lens group that has a positive refractive power and remains stationary during zooming, a plurality of movable lens groups that move during zooming, and a final lens group that has a positive refractive power and remains stationary during zooming. The final lens group has two or more positive ED lenses formed of a material satisfying predetermined conditional expressions. The predetermined conditional expressions, which relate to extraordinary low dispersion and temperature coefficients of the refractive indices of the positive lenses in the movable lens group closest to the image side and the final lens group, are satisfied.

Abstract: The imaging lens includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power. During focusing, only the second lens group moves in the direction of the optical axis. A lens closest to the object side in the first lens group and a lens adjacent to the lens on the image side have positive refractive powers, and the second lens group includes two or three lenses. Further, predetermined Conditional Expressions (1), (2), (3a), and (3b) are satisfied.

Abstract: Provided are an imaging lens, which has a small F number and in which various aberrations are satisfactorily corrected, and an imaging apparatus including the imaging lens. The imaging lens includes, in order from an object side: a first lens that has a biconcave shape; a second lens that is convex toward an image side and has a positive refractive power; a third lens that has a biconvex shape; a fourth lens that has a negative refractive power; a fifth lens that has a positive refractive power; and a sixth lens that has a negative refractive power. Assuming that L1f and L1r are paraxial radii of curvature of an object side surface and an image side surface of the first lens, Conditional Expression (1) is satisfied. 0.1<(L1f+L1r)/(L1f?L1r)<0.