Abstract: A zoom lens includes, sequentially from an 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. When zoom is changed from a wide angle end to a telephoto end, an interval between the first lens group and the second lens group increases, and an interval between the second lens group and third lens group decreases. The second lens group comprises, sequentially from the object side, a second A lens group having a negative refractive power and a second B lens group having a negative refractive power, and the second B group is displaced in a direction perpendicular to an optical axis to perform a vibration prevention function.

Abstract: A zoom lens includes, sequentially from an object side, a positive first lens group, a negative second lens group, a positive third lens group, and a positive rear lens group. During zooming from a wide angle position to a telephoto position, an interval between the first lens group and the second lens group increases, and an interval between the second lens group and the third lens group decreases. The rear lens group includes a positive first sub-group, a negative second sub-group, and a positive third sub-group, and focusing is performed by moving the second sub-group toward an image surface side. The zoom lens satisfies the following conditions: 0.2<frt/ft<1.8 and 0.2<|fb|/frt<1.0, where “frt” denotes a focal length of the rear lens group at the telephoto position, “fb” denotes a focal length of the second sub-group, and “ft” denotes a focal length of the zoom lens at the telephoto position.

Abstract: In a vibration proof zoom lens 100, a third lens group G3 has a positive lens 7, a positive cemented lens 8, a negative cemented lens 9, which are arranged in order from an object side. In variable-magnifying from a wide angle limit to a telephoto limit, a clearance between a first lens group G1 and a second lens group G2 is increased and at the same time, a clearance between the second lens group G2 and a third lens groupG3 is decreased, a focusing from an infinity side to a close side is performed by moving the positive lens 7 toward an image, and a vibration proof is performed by moving the cemented lens 9 in a direction perpendicular to an optical axis to change an image position.

Abstract: A zoom lens includes, sequentially from an object side, a positive first lens group, a negative second lens group, a positive third lens group, and a positive rear lens group. During zooming from a wide angle position to a telephoto position, an interval between the first lens group and the second lens group increases, and an interval between the second lens group and the third lens group decreases. The rear lens group includes a positive first sub-group, a negative second sub-group, and a positive third sub-group, and focusing is performed by moving the second sub-group toward an image surface side. The zoom lens satisfies the following conditions: 0.2<frt/ft<1.8 and 0.2<|fb|/frt<1.0, where “frt” denotes a focal length of the rear lens group at the telephoto position, “fb” denotes a focal length of the second sub-group, and “ft” denotes a focal length of the zoom lens at the telephoto position.

Abstract: A zoom lens includes, sequentially from an 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. When zoom is changed from a wide angle end to a telephoto end, an interval between the first lens group and the second lens group increases, and an interval between the second lens group and third lens group decreases. The second lens group comprises, sequentially from the object side, a second A lens group having a negative refractive power and a second B lens group having a negative refractive power, and the second B group is displaced in a direction perpendicular to an optical axis to perform a vibration prevention function.

Abstract: A zoom lens and a photographing apparatus including the same. The zoom lens includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and an additional lens grouping having a positive refractive power, which are sequentially arranged from an object side, wherein the additional lens grouping comprises a third lens group having a positive refractive power.

Abstract: A zoom lens and a photographing apparatus including the same. The zoom lens includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and an additional lens grouping having a positive refractive power, which are sequentially arranged from an object side, wherein the additional lens grouping comprises a third lens group having a positive refractive power.

Abstract: A zoom lens including, in a sequence from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a succeeding lens group having an overall positive refractive power, and having a high zoom magnification and a compact size.

Abstract: In a vibration proof zoom lens 100, a third lens group G3 has a positive lens 7, a positive cemented lens 8, a negative cemented lens 9, which are arranged in order from an object side. In variable-magnifying from a wide angle limit to a telephoto limit, a clearance between a first lens group G1 and a second lens group G2 is increased and at the same time, a clearance between the second lens group G2 and a third lens groupG3 is decreased, a focusing from an infinity side to a close side is performed by moving the positive lens 7 toward an image, and a vibration proof is performed by moving the cemented lens 9 in a direction perpendicular to an optical axis to change an image position.

Abstract: A zoom lens and a photographing apparatus including the same. The zoom lens includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and an additional lens grouping having a positive refractive power, which are sequentially arranged from an object side, wherein the additional lens grouping comprises a third lens group having a positive refractive power.

Abstract: A zoom lens including, in a sequence from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a succeeding lens group having an overall positive refractive power, and having a high zoom magnification and a compact size.

Abstract: At least one exemplary embodiment is directed to an optical system which includes at least one first refractive optical element, which includes a solid material satisfying the following conditional expression (1), and at least one second refractive optical element, which includes a solid material satisfying the following conditional expression (2): ?1.33×10?3×?d+6.7×10?1<?gF ??(1) ?1.63×10?3×?d+6.2×10?1>?gF ??(2) where ?d and ?gF indicate the Abbe number and the partial dispersion ratio, respectively.

Abstract: At least one exemplary embodiment is directed to an optical system which includes at least one first refractive optical element, which includes a solid material satisfying the following conditional expression (1), and at least one second refractive optical element, which includes a solid material satisfying the following conditional expression (2): ?1.33×10?3×?d+6.7×10?1<?gF ??(1) ?1.63×10?3×?d+6.2×10?1>?gF ??(2) where ?d and ?gF indicate the Abbe number and the partial dispersion ratio, respectively.

Abstract: A zoom lens system, with a new structure that exhibits high optical performance over the entirety of a zoom range and the entirety of a focusing range, is disclosed. This zoom lens system comprises, in order from an object side to an image side: a front lens group which includes a plurality of lens units that move during zooming; a lens unit with negative optical power which moves during zooming and moves towards the object side during focusing from an infinity object to a close-distance object; and a lens unit with positive optical power which does not move for zooming.

Abstract: A zoom lens system includes a front lens group and a rear lens group arranged from an object side to an image side in that order. The front lens group includes a plurality of lens units, and during zooming from a wide angle end to a telephoto end, imaging magnification is increased by changing spaces between the plurality of lens units. The rear lens group with positive optical power as a whole includes a lens unit IS with negative optical power being movable so as to have a direction perpendicular to an optical axis, and a lens component RB2 with positive optical power disposed on the image side with respect to the lens unit IS. A space between the lens unit IS and the lens component RB2 is changed during zooming. The following condition is established to satisfy: 0.05<|fis|/ft<0.25, wherein (fis) denotes a focal distance of the lens unit IS, and (ft) denotes a focal distance at the telephoto end of the zooming lens system.

Abstract: A zoom lens system, with a new structure that exhibits high optical performance over the entirety of a zoom range and the entirety of a focusing range, is disclosed. This zoom lens system comprises, in order from an object side to an image side: a front lens group which includes a plurality of lens units that move during zooming; a lens unit with negative optical power which moves during zooming and moves towards the object side during focusing from an infinity object to a close-distance object; and a lens unit with positive optical power which does not move for zooming.

Abstract: A zoom lens system, with a new structure that exhibits high optical performance over the entirety of a zoom range and the entirety of a focusing range, is disclosed. This zoom lens system comprises, in order from an object side to an image side: a front lens group which includes a plurality of lens units that move during zooming; a lens unit with negative optical power which moves during zooming and moves towards the object side during focusing from an infinity object to a close-distance object; and a lens unit with positive optical power which does not move for zooming.

Abstract: A zoom lens system includes a front lens group and a rear lens group arranged from an object side to an image side in that order. The front lens group includes a plurality of lens units, and during zooming from a wide angle end to a telephoto end, imaging magnification is increased by changing spaces between the plurality of lens units. The rear lens group with positive optical power as a whole includes a lens unit IS with negative optical power being movable so as to have a direction perpendicular to an optical axis, and a lens component RB2 with positive optical power disposed on the image side with respect to the lens unit IS. A space between the lens unit IS and the lens component RB2 is changed during zooming. The following condition is established to satisfy: 0.05<|fis|/ft<0.25, wherein (fis) denotes a focal distance of the lens unit IS, and (ft) denotes a focal distance at the telephoto end of the zooming lens system.

Abstract: A zoom lens system includes a front lens group and a rear lens group arranged from an object side to an image side in that order. The front lens group includes a plurality of lens units, and during zooming from a wide angle end to a telephoto end, imaging magnification is increased by changing spaces between the plurality of lens units. The rear lens group with positive optical power as a whole includes a lens unit IS with negative optical power being movable so as to have a direction perpendicular to an optical axis, and a lens component RB2 with positive optical power disposed on the image side with respect to the lens unit IS. A space between the lens unit IS and the lens component RB2 is changed during zooming. The following condition is established to satisfy: 0.05<|fis|/ft<0.25, wherein (fis) denotes a focal distance of the lens unit IS, and (ft) denotes a focal distance at the telephoto end of the zooming lens system.

Abstract: A zoom lens system includes a front lens group and a rear lens group arranged from an object side to an image side in that order. The front lens group includes a plurality of lens units, and during zooming from a wide angle end to a telephoto end, imaging magnification is increased by changing spaces between the plurality of lens units. The rear lens group with positive optical power as a whole includes a lens unit IS with negative optical power being movable so as to have a component in a direction perpendicular to an optical axis, and a lens component RB2 with positive optical power disposed on the image side with respect to the lens unit IS. A space between the lens unit IS and the lens component RB2 is changed during zooming. The following condition is established to satisfy: 0.05<|fis|/ft<0.25, wherein (fis) denotes a focal distance of the lens unit IS, and (ft) denotes a focal distance at the telephoto end of the zooming lens system.