Abstract: A zoom lens includes a lens unit Lv positioned at the most object side of a plurality of lens units having the negative refractive power, a lens unit Lp positioned at the most object side of lens units having a positive refractive power, the lens units being positioned at an image side of the lens unit Lv, and lens units Fp and Fn respectively having a positive and a negative refractive power positioned at an image side of the lens unit Lp, the lens units Fp and Fn being configured to move during focusing. During focusing from infinity to minimum object distance, the lens unit Fp and the lens unit Fn move in the same direction in a wide angle range, and the lens unit Fp moves to an object side and the lens unit Fn moves to an image side in a telephoto range.

Abstract: The 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 lens group including one or more lens units and having as a whole a positive refractive power. The first and rear lens group are moved during zooming so that a distance therebetween decreases at a telephoto end as compared with at a wide-angle end. The first lens unit includes an image side aspheric lens having a negative aspheric amount and one or more object side aspheric lenses disposed on the object side further than the image side aspheric lens. A condition of 0.060<?Aspi×Ndi/BLD1<0.200 is satisfied where Aspi represents an aspheric amount of an i-th object side aspheric lens, Ndi represents a refractive index of the i-th object side aspheric lens, BLD1 represents a length of the first lens unit.

Abstract: A zoom lens includes, in order from an object side to an image side, a first, a second, a third, a fourth, a fifth, a sixth and a seventh lens units respectively having positive, negative, positive, negative, positive, negative and positive refractive powers. A distance between adjacent lens units change during zooming so that a distance between the fourth lens unit and the fifth lens unit at a telephoto end is shorter than the distance at a wide angle end and a distance between the fifth lens unit and the sixth lens unit at the telephoto end is longer than the distance at the wide angle end. And the fourth lens unit moves during focusing.

Abstract: The zoom lens includes a first lens unit being disposed closest to an object and having a positive optical power, and at least one subsequent lens unit being disposed closer to an image than the first lens unit. The first lens unit is moved toward the object during variation of magnification from a wide-angle end to a telephoto end. The first lens unit is constituted by at least three lenses including a positive meniscus lens being disposed closest to the image among the at least three lenses and having an image side concave surface, and a negative lens being disposed on an object side next to the positive meniscus lens. A condition of 1.55<Rpi/f1<2.90 is satisfied where Rpi represent a curvature radius of the image side concave surface of the positive meniscus lens, and f1 represents a focal length of the first lens unit.

Abstract: A zoom lens includes, a lens unit Lp having the highest positive refractive power, a lens unit Ln having negative refractive power, and a lens unit Lp2 having positive refractive power. In a first region, focusing from an infinite distance to a predetermined finite distance and zooming are able to be performed. In a second region in which macro driving is performed from a telephoto end to a macro end, two or more lens units are moved during macro driving so that the lens unit Lp is located closer to the object side than at a wide-angle end, a distance between the lens unit Lp and the lens unit Ln is larger at the macro end than at the wide-angle end, and a distance between the lens unit Ln and the lens unit Lp2 is smaller at the macro end than at the wide-angle end.

Abstract: The zoom lens includes in order from an object side to an image side where N represents an integer equal to or more than 5, a first lens unit, a second lens unit, an (N?2)-th lens unit, an (N?1)-th lens unit and an N-th lens unit respectively having positive, negative, positive, negative and positive refractive powers. The (N?1)-th lens unit includes an image stabilizing lens unit. The conditions of 0.01<BldN/TDw<0.09 and 2.0<fN/fw<8.0 are satisfied where BldN represents a length of the N-th lens unit on the optical axis, TDw represents a distance on the optical axis between a most object side lens surface and a most-image side lens surface at a wide-angle end, fw represents a focal length of the entire zoom lens at the wide-angle end, and fN represents a focal length of the N-th lens unit.

Abstract: A zoom lens includes, in order from an object side to an image side, a lens unit Ln having the highest negative refractive power of all the following lens units, a lens unit Lm2 having positive refractive power, a lens unit Lm having negative refractive power, and a rear lens group Lp including one or more lens units and having overall positive refractive power. During zooming, a distance between every adjacent lens units varies. During focusing from an infinite distance to a minimum object distance, the lens unit Ln and the lens unit Lm move toward the object side. The focal length FLm of the lens unit Lm and the focal length FLm2 of the lens unit Lm2 are appropriately set.

Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, a rear lens group having a positive refractive power as a whole and including at least one lens unit. An interval between the first lens unit and the rear lens group at the telephoto end is smaller than that at the wide angle end. The first lens unit includes a first aspheric lens having a positive aspheric amount, and a second aspheric lens having a negative aspheric amount on the image side of the first aspheric lens. The predetermined conditional expressions are satisfied.

Abstract: The zoom lens includes a first lens unit being disposed closest to an object and having a positive optical power, and at least one subsequent lens unit being disposed closer to an image than the first lens unit. The first lens unit is moved toward the object during variation of magnification from a wide-angle end to a telephoto end. The first lens unit is constituted by at least three lenses including a positive meniscus lens being disposed closest to the image among the at least three lenses and having an image side concave surface, and a negative lens being disposed on an object side next to the positive meniscus lens. A condition of 1.55<Rpi/f1<2.90 is satisfied where Rpi represent a curvature radius of the image side concave surface of the positive meniscus lens, and f1 represents a focal length of the first lens unit.

Abstract: A zoom lens includes N lens units, in which a lens unit having a positive refractive power is disposed closest to an object side. Each lens unit is moved to effect zooming. An (N?1)th lens unit and an N-th lens unit, counted from the object side, have positive refractive powers. The (N?1)th lens unit includes a first lens subunit having a positive refractive power and a second lens subunit having a negative refractive power in order from the object side to an image side. The second lens subunit is moved to have a component in a direction perpendicular to an optical axis to move an image position. A focal length fN of the N-th lens unit, a back focus bkt at the telephoto end, and an amount of movement mN of the N-th lens unit during zooming from a wide-angle end to a telephoto end are appropriately set.

Abstract: A zoom lens includes a lens unit Ln having negative refractive power including two or less lenses moving during focusing and zooming, a lens unit Lp1 having positive refractive power disposed adjacent to an object side thereof, and a lens unit Lp2 having positive refractive power disposed adjacent to an image side thereof. The lens units Lp1 and Lp2 move during zooming. A distance Tlw between a lens surface nearest to the object side in the entire zoom lens and an image plane at a wide-angle end, a distance Dnw between the lens surface nearest to the image side of the lens unit Ln and the image plane at the wide-angle end, a back focus bfw at the wide-angle end, and a maximum amount of movement Mnz during focusing of the lens unit Ln at a telephoto end are appropriately set.

Abstract: A zoom lens includes an aperture stop and a plurality of lens units which are moved during zooming. The plurality of lens units includes, on an object side of the aperture stop, a lens unit Lp having a positive refractive power and a lens unit Ln having a negative refractive power which is disposed to be adjacent to an image side of the positive lens unit Lp. At least one of the positive lens unit Lp and the negative lens unit Ln includes two or less lenses which are moved during focusing, and a focal length Fp of the positive lens unit Lp and a focal length Fn of the negative lens unit Ln are appropriately set based on predetermined mathematical conditions.

Abstract: A rear attachment lens detachably attached to a main lens system at an image side thereof to lengthen a focal length includes a negative lens disposed such that, when L is a distance between a lens surface closest to an object side and a lens surface closest to an image side in the rear attachment lens, the negative lens is within an area in which a distance from the lens surface closest to the object side to the negative lens is in the range of 0.5 L to 1.0 L. When ?dn1 is an Abbe number of a material of the negative lens with respect to the d-line and ?gFn1 is a partial dispersion ratio of the material of the negative lens with respect to the g-line and the F-line, the following conditions are satisfied: 10<?dn1<23 0.020<?gFn1?0.6438+0.001682*?dn1<0.100.

Abstract: A photographic lens includes, 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, a stop, and a third lens unit having a positive refractive power. In the photographic lens, the third lens unit moves towards the object side while the second lens unit moves towards the image side during focusing from an infinitely distant object to a closest distance object. In addition, in the photographic lens, an image forming magnification of the second lens unit during focusing on a closest distance object is appropriately set.

Abstract: The zoom lens includes a first lens unit being disposed closest to an object and having a positive optical power, and at least one subsequent lens unit being disposed closer to an image than the first lens unit. The first lens unit is moved toward the object during variation of magnification from a wide-angle end to a telephoto end. The first lens unit is constituted by at least three lenses including a positive meniscus lens being disposed closest to the image among the at least three lenses and having an image side concave surface, and a negative lens being disposed on an object side next to the positive meniscus lens. A condition of 1.55<Rpi/f1<2.90 is satisfied where Rpi represent a curvature radius of the image side concave surface of the positive meniscus lens, and f1 represents a focal length of the first lens unit.

Abstract: An zoom lens includes a front unit having positive refractive power, an aperture stop, and a rear unit. The front unit has a positive lens Gp1 and the rear unit has a negative lens Gn1. When an Abbe number of a material of the positive lens Gp1, and a partial dispersion ratio of the material thereof for a g-line and an F-line is defined as ?dp1 and ?gFp1 respectively, and a refractive index and an Abbe number of a material of the negative lens Gn1 for a d-line, and a partial dispersion ratio of the material thereof for the g-line and the F-line is defined as Ndn1 ?dn1 and ?gFn1 respectively, satisfying the following conditions: 75<?dp1<99, 0.020<?gFp1?0.6438+0.001682×?dp1<0.100, 1.75<Ndn1<2.10, and 0.020<?gFn1?0.6438+0.001682×?dn1<0.100.

Abstract: An zoom lens includes a front unit having positive refractive power, an aperture stop, and a rear unit. The front unit has a positive lens Gp1 and the rear unit has a negative lens Gn1. When an Abbe number of a material of the positive lens Gp1, and a partial dispersion ratio of the material thereof for a g-line and an F-line is defined as ?dp1 and ?gFp1 respectively, and a refractive index and an Abbe number of a material of the negative lens Gn1 for a d-line, and a partial dispersion ratio of the material thereof for the g-line and the F-line is defined as Ndn1 ?dn1 and ?gFn1 respectively, satisfying the following conditions: 75<?dp1<99, 0.020<?gFp1?0.6438+0.001682×?dp1<0.100, 1.75<Ndn1<2.10, and 0.020<?gFn1?0.6438+0.001682×?dn1<0.100.

Abstract: A rear attachment lens detachably attached to a main lens system at an image side thereof to lengthen a focal length includes a negative lens disposed such that, when L is a distance between a lens surface closest to an object side and a lens surface closest to an image side in the rear attachment lens, the negative lens is within an area in which a distance from the lens surface closest to the object side to the negative lens is in the range of 0.5L to 1.0L. When ?dn1 is an Abbe number of a material of the negative lens with respect to the d-line and ?gFn1 is a partial dispersion ratio of the material of the negative lens with respect to the g-line and the F-line, the following conditions are satisfied: 10<?dn1<23 0.020<?gFn1?0.6438+0.001682*?dn1<0.100.

Abstract: A photographic lens includes, 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, a stop, and a third lens unit having a positive refractive power. In the photographic lens, the third lens unit moves towards the object side while the second lens unit moves towards the image side during focusing from an infinitely distant object to a closest distance object. In addition, in the photographic lens, an image forming magnification of the second lens unit during focusing on a closest distance object is appropriately set.

Abstract: An optical system used for an image pickup apparatus including an image pickup element is provided. The optical system includes a negative lens disposed furthest away on the enlargement conjugation side and satisfies the following condition: 80 degrees<2?, where 2? (degrees) denotes an angle of view of the optical system. In addition, the following parameters of the optical system are optimally determined: a lens open angle ? of a surface of the negative lens on the reduction conjugation side, an index of refraction Ndn and an Abbe number ?dn of a material of the negative lens for a d-line, and a relative partial dispersion ?gFn of the material of the negative lens for a g-line and an F-line.