Abstract: In a photographing lens unit, an aperture diaphragm, a first lens having positive refractive power, a second lens having negative refractive power, a third lens of a positive meniscus lens with a concave surface on the object side, an ND filter, a fourth lens of a negative meniscus lens with a convex surface on the object side, an IR cut filter, and an imaging element are disposed in order from the object side to the imaging element side. In the third lens, a surface shape on the object side changes from concave to convex as it is away from an optical axis, and a surface shape on the image side changes from convex to concave as it is away from the optical axis. In the fourth lens, a surface shape on the object side changes from convex to concave as it is away from the optical axis.

Abstract: There is disclosed a zoom lens system comprising, in order from an object side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; and a fourth lens unit having a negative refractive power. During zooming from a wide-angle end to a telephoto end, a space between the first lens unit and the second lens unit enlarges, a space between the second lens unit and the third lens unit narrows, a space between the third lens unit and the fourth lens unit changes, and all of the first to fourth lens units move along an optical axis. The zoom lens system further comprises an aperture stop which moves integrally with the third lens unit during the zooming.

Abstract: An exemplary imaging lens includes, in this order from the object side to the image side thereof, a first lens of positive refraction power, a second lens of negative refraction power, a third lens of positive refraction power, and a fourth lens of negative refraction power. The imaging lens satisfies the formulas of: (1) 1<T/F<1.29; (2) R3/F>15 and (3) R7>0, R6<0, where T is the overall length of the imaging lens, F is the effective focal length of the imaging lens, R3 is the radius of curvature of the object-side surface of the second lens, R6 is the radius of curvature of the image-side surface of the third lens, and R7 is the radius of curvature of the object-side surface of the fourth lens.

Abstract: It is to provide an imaging lens and an imaging device including the imaging lens in which the imaging lens can maintain excellent optical performance, while achieving sufficient reduction in size and weight. The imaging lens comprises, in order from an object side to an image surface side, a diaphragm, a first lens that is a biconvex lens having a positive power, a second lens having a negative power, a third lens having a positive power, and a fourth lens that is a biconcave lens, wherein a condition expressed by 0.7?FL/f1?3.0 (where, FL: focal distance of the entire lens system, and f1: focal distance of the first lens) is to be satisfied.

Abstract: An imaging lens is provided and includes: in order from an object side of the imaging lens, a first lens having a positive refractive power and having a convex surface on the object side; a second lens having a negative refractive power and having a concave surface on the object side; a third lens having a positive refractive power in the vicinity of an optical axis thereof; and a fourth lens of a meniscus lens having a negative refractive power and having a convex surface on the object side, the imaging lens satisfying the specific conditional expressions.

Abstract: An optical lens system includes a first lens having positive lens power; a second lens having negative lens power; a third lens having positive lens power; and a fourth lens having negative lens power, wherein the first through fourth lenses are sequentially arranged from a subject.

Abstract: An imaging lens is provided and includes: in order from the object side, a first lens having a convex surface on the object side and having a positive power; an aperture diaphragm; a second lens having a concave surface on the object side and having a negative power; a third lens having a positive power; and a fourth lens having a convex surface on the object side near the optical axis, the fourth lens having a meniscus shape. The imaging lens satisfies conditional expressions: 0.2<D2/f<0.4 ??(1) TL/f<1.3 ??(2) where f represents a focal distance of the imaging lens; D2 represents an air interval between the first lens and second lens along an optical axis of the imaging lens; and TL represents a distance (along the optical axis) from an object-side surface of the first lens to an image forming surface.

Abstract: An optical system (1) of telescope includes an objective lens (10) for collecting incident light and transmitting the incident light along a light path, and an imaging lens group (20) disposed on the light path that makes the optical system focus on an image plane (40). The imaging lens group includes two positive lenses and two negative lenses. Each lens of the imaging lens group has a refractive index less than 1.80.

Abstract: An image pickup lens assembly comprises three lens groups, from the object side to the image side: a first lens group, a second lens group, and a third lens group. The first lens group includes two lenses with refractive power, namely, a first lens with positive refractive power, and a second lens with negative refractive power. The front surface of the first lens is convex, and the rear surface of the second lens is concave. The second lens group includes a meniscus third lens with positive refractive power, the rear surface of the third lens is convex. The third lens group includes a fourth lens with negative refractive power, the front surface of the fourth lens is convex, and the rear surface of the fourth lens is aspheric. An aperture stop is located between the first lens and the second lens of the first lens group for controlling the brightness of the optical system.

Abstract: An autofocusing optical system of a camera module which can be installed in a subminiature camera module. In the optical system, a first lens group has an overall positive refractive power. A second lens group has an overall negative refractive power. The second lens group includes a liquid lens having a meniscus formed between non-miscible first and second liquids, the first liquid having conductivity and polarity, the meniscus having a curvature radius changing in response to a voltage applied to serve as a refractive surface, thereby autofocusing the optical system, a first cover lens for sealing the liquid lens at an object side and a second cover lens for sealing the liquid lens at an image side. A third lens group has an overall positive refractive power. Also, a fourth lens group has an overall negative refractive power.

Abstract: Object is to provide an inner-focusing type zoom lens system carrying out focusing by moving a portion of a first lens group suitable for an auto-focus SLR camera. A zoom lens 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. Upon zooming from a wide-angle end state to a telephoto end state, a distance between the first and the second lens groups increases, and a distance between the second and the third lens groups decreases. The first lens group is composed of, in order from the object, a 1A lens group G1A having positive refractive power, and a 1B lens group G1B having positive refractive power. Focusing from infinity to a close-range object is carried out by moving only the 1B lens group G1B to the object.

Abstract: A small size photographic lens for the photographic unit of a device such as a camera or a camera phone. The photographic lens includes: a first lens having positive refractive power; a second lens having negative refractive power and a convex surface facing the object side; a third lens having positive refractive power; and a fourth lens having negative refractive power at the center portion, in which the negative refractive power becomes weaker from the center portion toward the peripheral portion of the fourth lens, and having a positive refractive power at the peripheral portion thereof, the lenses being numbered in order of location from the object.

Abstract: An imaging lens is provided and includes: in order from an object side of the imaging lens, a first lens having a convex surface on the object side and having a positive power; a second lens having a concave surface on the object side and having a negative power; a third lens having a positive power; and a fourth lens having a convex surface on the object side near a paraxial axis and having a meniscus shape. The imaging lens satisfies conditional expressions specified in the specification.

Abstract: A subminiature imaging optical system suitable for a subminiature optical device such as a mobile phone camera. An aperture stop is provided. A first lens has a positive refractive power and is convex at an object side. A second lens has a negative refractive power. A third lens has a positive refractive power. Also, a fourth lens has a negative refractive power. The optical system has a total length along an optical axis direction according to following relation 1: 1.2<TL/f<1.5relation 1, where TL is a distance from the aperture stop to an image plane, and f is an effective focal distance of an entire optical system.

Abstract: The present invention provides an image pickup lens for forming a light flux from a subject into an image on an image pickup element, and the image pickup lens includes, in order from an object side thereof: an aperture stop; a first lens having a positive refractive power; a second lens having a negative refractive power and comprising a concave surface facing an image side of the image pickup lens; a third lens having a positive refractive power; and a fourth lens having a negative refractive power and comprising a concave surface facing the image side. The image pickup lens satisfies the predetermined condition according to a curvature radius of the surface facing the image side on the second lens, and a focal length of the image pickup lens.

Abstract: An optical system comprises from the object side: a positive first lens element, a negative second lens element, a positive third lens element, a fourth lens element, and an aperture stop located between the object side of the optical system and the second lens element for controlling the brightness of the optical system. A radius of curvature R3 of a front surface of the second lens element satisfies the relation: ?0.02 [1/mm]<1/R3<0.22 [1/mm], an Abbe number V2 of the second lens element is less than 40. A focal length of the fourth lens element is f4, a focal length of the optical system is f, they satisfy the relation: f/f4<0.1, at least one inflection point is formed on the rear surface of the fourth lens element.

Abstract: A subminiature imaging optical system suitable for a subminiature optical device such as a mobile phone camera. An aperture stop is provided. A first lens has a positive refractive power and is convex at an object side. A second lens has a negative refractive power. A third lens has a positive refractive power. Also, a fourth lens has a negative refractive power. The optical system has a total length along an optical axis direction according to following relation 1: 1.2<TL/f<1.5 relation 1, where TL is a distance from the aperture stop to an image plane, and f is an effective focal distance of an entire optical system.

Abstract: An imaging optical system includes, in order from an object side, a first lens having positive refracting power, a concave surface of which is directed toward the object side, a third lens having positive refracting power, a convex surface of which is directed toward an image side and a fourth lens having negative refracting power, wherein the second lens and the third lens are cemented together. Having such a configuration, an angle made by the incident light and the exiting light to the cemented lens can be kept small, and accordingly, the generation of aberrations at the refracting surface and performance change of lenses when these are in a relative decentering position can be suppressed.

Abstract: Providing an interchangeable lens capable of carrying out quick focus from infinity to a close object with a magnification of almost life size by a light-weight moving lens group, exhibiting excellent imaging performance across an entire focusing range, and obtaining excellent imaging performance by a vibration reduction lens and its drive system appropriately arranged even upon vibration reduction. The lens includes a first group having positive power, a second group having negative power, a third group having positive power, and a fourth group having negative power. The fourth group includes a front group having negative power and a rear group having positive power. When the lens is vibrated, the lens corrects image blur by shifting the front group almost perpendicularly to an optical axis. When focusing from infinity to a close object, the first and the front groups are fixed and at least the third group is moved toward the object side.

Abstract: An image pickup lens for forming a subject image on an photoelectric converter of a solid-sate image pickup element, includes: an aperture stop; a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; and a fourth lens having a negative refractive power. The aperture stop and the first to fourth lenses are arranged in this order from an object side of the image pickup lens, and the image pickup lens satisfies predefined condition.

Abstract: An image pickup lens can form an excellent optical image on a compact image pickup element having a large number of pixels. The image pickup lens includes, sequentially from the object side, an optical aperture, a first lens made of glass and having at least a spherical surface at the object side and a positive refracting power, a second lens made of resin and having two a spherical surfaces and a negative refracting power, a third lens made of glass and having at least a spherical surface at the object side and a positive refracting power, and a fourth lens made of resin and having two a spherical surfaces and a negative refracting power.

Abstract: A 1× projection optical system for deep ultra-violet (DUV) photolithography is disclosed. The optical system is a modified Dyson system capable of imaging a relatively large field at high numerical apertures at DUV wavelengths. The optical system includes a lens group having first and second prisms and four lenses having a positive-negative-positive negative arrangement as arranged in order from the prisms toward the mirror. A projection photolithography system that employs the projection optical system of the invention is also disclosed.

Abstract: A lens system has a plurality of lenses, a stop, and a diffractive surface, the entire lens system moves during focusing, and the lens system satisfies the condition of ??0.5, where ? is a maximum photographic magnification.

Abstract: A lens that can be used in a digital camera includes in sequence a first lens element (20), a second lens element (30), a third lens element (40), and a fourth lens element (50). The first lens element is biconvex, and includes a first aspheric surface (22) and a second aspheric surface (24). The second lens is biconcave, and includes a third aspheric surface (32) and a fourth aspheric surface (34). The third lens element is concavo-convex, and includes a fifth aspheric surface (42) and a sixth aspheric surface (44). The fourth lens element includes a seventh aspheric surface (52) and a eighth aspheric surface (54), the seventh aspheric surface and the eighth aspheric surface being wavelike. All of the lens elements are made from plastic. The lens is light, has strong impact resistance, and provides good image quality.

Abstract: An imaging optical system that includes, in order from an object side, a first lens having positive refracting power, a concave surface of which is directed toward the object side, a third lens having positive refracting power, a convex surface of which is directed toward an image side and a fourth lens having negative refracting power, wherein the second lens and the third lens are cemented together. Having such a configuration, an angle made by the incident light and the existing light to the cemented lens can be kept small, and accordingly, the generation of aberrations at the refracting surface and performance change of lenses when these are in a relative decentering position can be suppressed.

Abstract: An image pickup lens includes: a first lens which is a positive lens having a positive refractive power; a second lens which is a negative lens having a negative refractive power; a third lens which is a positive lens; a fourth lens having at least one surface with an aspherical shape, wherein the first lens, the second lens, the third lens and the fourth lens are arranged from an object side of the image pickup lens in this order and the image pickup lens is designed using a predefined condition.

Abstract: A lens system has a plurality of lenses, a stop, and a diffractive surface, the entire lens system moves during focusing, and the lens system satisfies the condition of ??0.5, where ? is a maximum photographic magnification.

Abstract: The image forming optical system comprises, in order from an object side, a first lens which is positive meniscus lens having a convex surface directed toward an object side, an aperture stop, a second lens which is positive meniscus lens having a convex surface directed toward an image side, a third lens which is positive meniscus lens having a convex surface directed toward an image side, and a fourth lens which is negative lens, wherein at least one of surfaces of the fourth lens is aspherical and the following condition is satisfied: ?2.0<?m/?p<0 where ?m represents the power of the fourth lens at the position of the maximum light height and ?p represents the power of the fourth lens at the position of the praxis. The third lens and the fourth lens are made of plastic material and the following condition is satisfied: 15.0<?3??4<40.0 where ?3 represents Abbe's number of the third lens and ?4 represents Abbe's number of the fourth lens.

Abstract: A telephoto lens includes, in order from the object side, a first lens unit having a positive refracting power, a second lens unit having a negative refracting power, a third lens unit having a positive refracting power, and a fourth lens unit having a negative refracting power. The second lens unit has a cemented lens composed of a positive lens and a negative lens, and a negative lens. The fourth lens unit has a cemented lens composed of a negative lens and a positive lens, and a negative lens. The telephoto lens satisfies the following conditions: ?d>80 ?0.5>f4/f>?1.2 where ?d is an Abbe's number of a lens having a positive refracting power in the first lens unit, f4 is a focal length of the fourth lens unit, and f is a focal length of the entire optical system.

Abstract: The present invention is directed to a photographing lens containing, in order from an object side: a first lens having a positive refractive power and a convex surface facing the object side; a second lens having a negative refractive power; a third lens having a positive refractive power; and a fourth lens having a negative refractive power and at least one aspheric surface, the photographing lens satisfying the following conditional expressions: L T f ? 1.2 0.5 ? f 3 f ? 1.0 where LT denotes the distance on the optical axis between the object side of the first lens and the image side of the fourth lens; f denotes the total focal length of the photographing lens; and f3 denotes the focal length of the third lens.

Abstract: A lens for reading an original, comprises five lenses as a whole including two positive and two negative lenses, an aspherical surface provided on at least one surface of the five lenses, a construction of four lens groups for five lenses which include a cemented lens constructed by cementing one of the positive lenses and one of the negative lenses, an aperture stop disposed between a second and third lens groups, and the cemented lens disposed adjacent to the aperture stop.

Abstract: A single focus lens is disclosed that is formed of only four lens elements. In order from the object side, these are: a first lens element of positive refractive power and having either a concave surface or planar surface on the object side; a second lens element of weak refractive power and meniscus shape that is made of plastic with at least one surface aspheric; a third lens element which has positive refractive power and a convex surface on the image side; and a fourth lens element of weak refractive power and meniscus shape that is made of plastic with at least one surface aspheric and with its concave surface on the image side. Preferably, various conditions are satisfied in order that the single focus lens be compact and favorably correct aberrations so as to provide a high quality image.

Abstract: This specification discloses an image taking lens system which can quickly effect focusing from an infinity object to a short-distance object. The image taking lens system disclosed in the present specification has, in succession from an object side to an image side, a first lens unit, a second lens unit, a third lens unit and a fourth lens unit. In case of focusing from the infinity object to the short-distance object, the first lens unit is not moved, but the second lens unit is moved to the image side and the third lens unit is moved to the object side. The principal point interval between the first lens unit and the second lens unit is a negative value.

Abstract: A 1X projection optical system for deep ultra-violet (DUV) photolithography is disclosed. The optical system is a modified Dyson system capable of imaging a relatively large field at high numerical apertures at DUV wavelengths. The optical system includes a lens group having first and second prisms and four lenses having a positive-negative-positive negative arrangement as arranged in order from the prisms toward the mirror. A projection photolithography system that employs the projection optical system of the invention is also disclosed.

Abstract: A high zoom-ratio zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, and a negative fourth lens group. Zooming is performed by moving each of the lens groups along the optical axis.

Abstract: An imaging optical system comprises, in order from an object side a first lens having positive refracting power, a second lens having negative refracting power, a concave surface of which is directed toward the object side, a third lens having positive refracting power, a convex surface of which is directed toward an image side and a fourth lens having negative refracting power, wherein the second lens and the third lens are cemented. By such constitution, an angle made by the incident light and the exiting light to the cemented lens can be kept small, and accordingly, the generation of aberrations at the refracting surface and performance change of lenses when these are in a relative decentering position can be suppressed to the utmost.

Abstract: The present invention is directed to a photographing lens containing, in order from an object side: a first lens having a positive refractive power and a convex surface facing the object side; a second lens having a negative refractive power; a third lens having a positive refractive power; and a fourth lens having a negative refractive power and at least one aspheric surface, the photographing lens satisfying the following conditional expressions: 1 L T f ≤ 1.2 0.5 ≤ f 3 f ≤ 1.

Abstract: A single focus lens is disclosed that is formed of only four lens components, which are arranged in positive, negative, positive and relatively weak positive or negative refractive power order from the object side, with a stop arranged between the first and second lens components. The third lens component has a convex surface on its image side, and the fourth lens component has a meniscus shape, is made of plastic, includes at least one aspheric surface, and is concave on its image side. The second lens component is formed of a single lens element, and various conditions are preferably satisfied so as to provide a compact lens having a short overall length while favorably correcting various aberrations.

Abstract: This specification discloses an image taking lens system which can quickly effect focusing from an infinity object to a short-distance object. The image taking lens system disclosed in the present specification has, in succession from an object side to an image side, a first lens unit, a second lens unit, a third lens unit and a fourth lens unit. In case of focusing from the infinity object to the short-distance object, the first lens unit is not moved, but the second lens unit is moved to the image side and the third lens unit is moved to the object side. The principal point interval between the first lens unit and the second lens unit is a negative value.

Abstract: A taking lens device has a zoom lens system having an optical system that is comprised of a plurality of lens units and that achieves zooming by varying the unit-to-unit distances and an image sensor that converts an optical image formed by the zoom lens system into an electric signal. The zoom lens system is comprised of, from the object side, a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a positive optical power, and a fourth lens unit having a negative optical power. At least one of the following conditional formula is fulfilled: 1.1<f1/fT<2.5, where f1 represents the focal length of the first lens unit, and fT represents the focal length of the entirety optical system at the telephoto end, and 0.3<D34W/D34T<2.5 where D34W and D34T represent axial distance between the third lens unit and the fourth lens unit at wide-angle end and telephoto end, respectively.

Abstract: A macro lens system which includes a positive first lens group, a negative second lens group, a positive third lens group, and a negative fourth lens group, in this order from the object. Upon focusing from an infinite photographing distance to the closest photographing distance, the second lens group moves towards the image, and the third lens group moves toward the object. The macro lens system satisfies the following condition: 3.7<|f×m/&Dgr;X3|<9.9  (1) wherein f designates the focal length of the entire lens system at an infinite photographing distance; m designates the transverse magnification at the closest photographing distance; and &Dgr;X3 designates the traveling distance of the third lens group from the infinite photographing distance to the closest photographing distance.

Abstract: A wide-angle zoom lens system having a short optical total length not only at the wide-angle end but also at the telephoto end and a reduced telephoto ratio despite the fact that it has a high zoom ratio, with a view to achieving a reduction in size of cameras. The zoom lens system has a first lens unit G1 of positive refractive power, a second lens unit G2 of negative refractive power, a third lens unit G3 of positive refractive power, and a fourth lens unit G4 of negative refractive power. When the zoom lens system is zoomed from the wide-angle side to the telephoto side, each of the lens units moves toward the object side such that the space between the first lens unit G1 and the second lens unit G2 increases, whereas the space between the third lens unit G3 and the fourth lens unit G4 decreases.

Abstract: An image scanning lens for an image scanner unit, such as a facsimile machine or document scanner is disclosed having only four lens elements with refractive power. In order from the object side, these are: a first lens element of positive refractive power and a meniscus shape with its convex surface on the object side; a second lens element of negative refractive power that is biconcave; a third lens element of positive refractive power that is biconvex; and a fourth lens element of negative refractive power having a concave surface on the object side. Various conditions are satisfied so as to provide a compact image scanning lens with a wide angle of view, and sufficiently corrected spherical aberration, astigmatism, and distortion so as to yield, when the lens is employed in an image scanner unit, a high quality scanned image that is comparatively bright.

Abstract: A bright image readout lens having a wider angle of view comprises, successively from the object side, a first lens L1 made of a positive meniscus lens having a convex surface directed onto the object side, a second lens L2 made of a biconcave lens, a third lens L3 made of a biconvex lens, and a fourth lens L4 made of a negative meniscus lens having a convex surface directed onto the imaging surface side, wherein at least one surface in at least one of the first lens L1 and third lens L3 is an aspheric surface, and wherein a stop is disposed between the second lens L2 and the third lens L3. This image readout lens favorably corrects various kinds of aberration.

Abstract: A photographic optical system greatly improved in chromatic aberration and capable of providing high image quality with a compact, lightweight and low-cost arrangement having a minimal number of constituent elements. The optical system has a negative lens placed closest to the image side thereof, and a positive lens, a negative lens and a positive lens, which are placed in order from the object side of the optical system on the object side of the negative lens closest to the image side. The negative lens closest to the image side satisfies the following conditions: 75.0≦&ngr;d and 0.8≦SG≦2.2, where &ngr;d and SG are the Abbe's number and lens specific gravity (g/cm3) of the negative lens closest to the image side.

Abstract: An image pickup optical system comprising, in order from the object side, a first lens component which comprises a meniscus lens element having a convex surface on the object side and a positive refractive power, a second lens component which comprises a negative lens element, a third lens component which comprises a negative meniscus lens element having a convex surface on the object side and a biconvex lens element, and a fourth lens component which comprises a negative meniscus lens element having a convex surface on the image side. This optical system is configured so as to have a large aperture, reserve a sufficient amount of marginal rays, and correct coma and curvature of field by disposing a stop on the object side of the third lens component and defining a refractive power of a cemented surface of the third lens component within a certain range.

Abstract: A collimator lens comprises, successively from a parallel luminous flux side, a positive lens, a cemented lens made of negative and positive lenses, a positive lens, and a negative lens, and satisfies a predetermined conditional expression, whereby, when carrying out multi-beam scanning, various kinds of aberration, such as image surface curvature amount in particular, are greatly reduced with respect to the respective light beams from individual light sources. Successively disposed from the parallel luminous flux side are a first lens L.sub.1 made of a biconvex lens having a surface with a stronger curvature directed onto the parallel luminous flux side, a second lens L.sub.2 made of a biconcave lens having a surface with a stronger curvature directed onto the parallel luminous flux side, a third lens L.sub.3 made of a biconvex lens having a surface with a stronger curvature directed onto the light source side, a fourth lens L.sub.

Abstract: Successively from an object side, a stop, a biconvex lens, a biconcave lens, a biconvex lens, and a meniscus lens having a convex surface directed onto the image side are disposed, while the image-side surfaces of the second and third lenses are set to have a predetermined range of power, thereby favorably correcting various kinds of aberration, such as distortion in particular, while reducing the size of the whole lens system. Disposed successively from the object side are a stop i, a first lens L.sub.1 made of a biconvex lens, a second lens L.sub.2 made of a biconcave lens, a third lens L.sub.3 made of a biconvex lens, and a fourth lens L.sub.4 made of a meniscus lens having a convex surface directed onto the image side. These lenses satisfy the following conditional expressions :0.4<R.sub.5/ f<2.00.4<.vertline.R.sub.7 .vertline./f<2.2whereinR.sub.5 is a radius of curvature of the surface of the second lens on the image side;R.sub.

Abstract: The present invention relates to a rotary drum type optical filter apparatus, which comprises a filter unit for receiving an optical signal to spectralize the optical signal; a lens unit provided at the center of the filter unit for varying an optical path of the optical signal; and a driving device engaged with the filter unit for providing a displacement of the filter unit relative to the lens unit to obtain different spectrum colors of the optical signal.

Abstract: A projection optical system of the present invention has a first lens group G1 being positive, a second lens group G2 being negative, a third lens group G3 being positive, a fourth lens group G4 being negative, a fifth lens group G5 being positive, and a sixth lens group G6 being positive in the named order from the first object toward the second object, in which the second lens group G2 comprises an intermediate lens group G2M between a negative front lens L2F and a negative rear lens L2R and in which the intermediate lens group G2M is arranged to comprise at least a first positive lens being positive, a second lens being negative, a third lens being negative, and a fourth lens being negative in the named order from the first object toward the second object.