Abstract: A zoom lens includes, in order from an object side, a first lens group G1 having a positive focal length, a second lens group G2 having a negative focal length, a third lens group G3 including an aperture stop S and having a positive focal length, a fourth lens group G4 having a negative focal length, and a rear side lens group G5. The first lens group includes a negative lens and a positive lens disposed in order from a most object side. The first lens group and the third lens group are fixed in power varying from a wide angle end to a telephoto end. The second lens group moves from the object side to an image side in the power varying. The zoom lens satisfies following conditional expressions (1) and (2). 2.1?F1/Fw?3.0 ??(1) ?1.2?F3/F2??0.

Abstract: A zoom lens having a large magnification ratio, small F-number change at zooming, and excellently corrected various aberrations, and an image pickup apparatus including the zoom lens are provided. The zoom lens includes a common optical system. The common optical system includes, sequentially from an object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, a fourth lens group G4 having negative refractive power, and a fifth lens group G5 having positive refractive power. In the common optical system, all intervals between each pair of adjacent lens groups change at zooming, and a distance between the fifth lens group G5 and an image plane is constant.

Abstract: A zoom optical system includes a front-side lens unit, an intermediate lens unit, and a rear-side lens unit. The front-side lens unit includes a first front unit and a second front unit, and a distance between the first front unit and the second front unit is wider at a telephoto end than at a wide angle end. The intermediate lens unit includes a first intermediate unit and a second intermediate unit, and a distance between the first intermediate unit and the second intermediate unit is narrower at the telephoto end than at the wide angle end. A distance between the second intermediate unit and a lens unit adjacent to the second intermediate unit varies. The second intermediate unit moves at the time of focusing, and the following conditional expressions (1) and (2) are satisfied: 0.9?LTLT/LTLW?1.17??(1) 4.2?KMBT?20.0??(2).

Abstract: A zoom lens includes 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, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power. The first lens unit includes a positive lens, and the second lens unit includes a positive lens, and the following conditional expressions (1), (2), (3), and (4) are satisfied: ?0.015?Tp2G_min_p?0.015??(1), 70.3??d1G_max_p??(2), 1.76?nd2G_max_p?2.3??(3), and 0.3?|f2/f3|?0.9??(4).

Abstract: A zoom lens includes a front-side lens unit, a rear-side lens unit, and an aperture stop. The front-side lens unit includes either one lens unit having a negative refractive power or two lens units having a negative refractive power, and has a negative refractive power as a whole. The rear-side lens unit is disposed on an image side of the front-side lens unit, and has a positive refractive power as a whole at a telephoto end. The rear-side lens unit includes a plurality of lens units, and includes an object-side positive lens unit having a positive refractive power which is disposed nearest to object and the following conditional expressions (1), (2), and (3) are satisfied: 1.2?|MGB_t|?6??(1), 10??dGn_min_p?27??(2), and ?0.03?TpGn_min_p?0.014??(3).

Abstract: A zoom optical system includes a front-side lens unit, an intermediate lens unit, and a rear-side lens unit. The front-side lens unit includes a first front unit and a second front unit, and a distance between the first front unit and the second front unit is wider at a telephoto end than at a wide angle end. The intermediate lens unit includes a first intermediate unit and a second intermediate unit, and a distance between the first intermediate unit and the second intermediate unit is narrower at the telephoto end than at the wide angle end. A distance between the second intermediate unit and a lens unit adjacent to the second intermediate unit varies. The second intermediate unit moves at the time of focusing, and the following conditional expressions (1) and (2) are satisfied: 0.9?LTLT/LTLW?1.17??(1) 4.2?KMBT?20.0??(2).

Abstract: A zoom lens includes, in order from the object side, a first lens unit having a positive focal length, a second lens unit having a negative focal length, a third lens unit having a positive focal length, a fourth lens unit having a negative focal length, and a fifth lens unit having a positive focal length, wherein following Conditional Expressions (1) and (2) are satisfied: 0.3?D34W/D45W?1??(1), and 0.2?(D34W/D45W)/(D34T/D45T)?0.6??(2).

Abstract: A zoom lens includes 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, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power. The first lens unit includes a positive lens, and the second lens unit includes a positive lens, and the following conditional expressions (1), (2), (3), and (4) are satisfied: ?0.015?Tp2G_min_p?0.015??(1), 70.3??d1G_max_p??(2), 1.76?nd2G_max_p?2.3??(3), and 0.3?|f2/f3|?0.9??(4).

Abstract: A zoom lens includes a front-side lens unit, a rear-side lens unit, and an aperture stop. The front-side lens unit includes either one lens unit having a negative refractive power or two lens units having a negative refractive power, and has a negative refractive power as a whole. The rear-side lens unit is disposed on an image side of the front-side lens unit, and has a positive refractive power as a whole at a telephoto end. The rear-side lens unit includes a plurality of lens units, and includes an object-side positive lens unit having a positive refractive power which is disposed nearest to object and the following conditional expressions (1), (2), and (3) are satisfied: 1.2?|MGB_t|?6 ??(1), 10??dGn_min_p?27 ??(2), and ?0.03?TpGn_min_p?0.014 ??(3).

Abstract: A zoom lens includes, in order from the object side, a first lens unit having a positive focal length, a second lens unit having a negative focal length, a third lens unit having a positive focal length, a fourth lens unit having a negative focal length, and a fifth lens unit having a positive focal length, wherein following Conditional Expressions (1) and (2) are satisfied: 0.3?D34W/D45W?1??(1), and 0.2?(D34W/D45W)/(D34T/D45T)?0.6??(2).

Abstract: A zoom lens comprising, 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, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power. Each distance between the first lens unit and the second lens unit, between the third lens unit and the fourth lens unit, and between the fourth lens unit and the fourth lens unit at the telephoto end is longer than at the wide angle end, and a distance between the second lens unit and the third lens unit at the telephoto end is shorter than at the wide angle end, and the following conditional expressions are satisfied. 2<mg3t/mg3w<6 1.2<mg5t/mg5w<4 0.02<f5/ft<0.

Abstract: A zoom lens comprising, 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, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power. Each distance between the first lens unit and the second lens unit, between the third lens unit and the fourth lens unit, and between the fourth lens unit and the fourth lens unit at the telephoto end is longer than at the wide angle end, and a distance between the second lens unit and the third lens unit at the telephoto end is shorter than at the wide angle end, and the following conditional expressions are satisfied. 2<mg3t/mg3w<6 1.2<mg5t/mg5w<4 0.02<f5/ft<0.

Abstract: A zoom lens comprising, 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, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power. Each distance between the first lens unit and the second lens unit, between the third lens unit and the fourth lens unit, and between the fourth lens unit and the fourth lens unit at the telephoto end is longer than at the wide angle end, and a distance between the second lens unit and the third lens unit at the telephoto end is shorter than at the wide angle end, and the following conditional expressions are satisfied. 2<mg3t/mg3w<6 1.2<mg5t/mg5w<4 0.02<f5/ft<0.

Abstract: A zoom lens comprises in order from an object side a first lens unit having a positive refractive power. The first lens unit consist one positive lens. The zoom lens satisfies the following conditional expressions (1) and (2). Fno(W)<2.7??(1) 3.1<ft/fw where, Fno(W) denotes an F-number of the zoom lens at a wide angle end, ft denotes a focal length at a telephoto end of the overall zoom lens system, and fw denotes a focal length at the wide angle end of the overall zoom lens system.

Abstract: A zoom lens comprising, 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, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power. Each distance between the first lens unit and the second lens unit, between the third lens unit and the fourth lens unit, and between the fourth lens unit and the fourth lens unit at the telephoto end is longer than at the wide angle end, and a distance between the second lens unit and the third lens unit at the telephoto end is shorter than at the wide angle end, and the following conditional expressions are satisfied. 2<mg3t/mg3w<6 1.2<mg5t/mg5w<4 0.02<f5/ft<0.

Abstract: The invention provides a zoom lens, characterized by comprising, a zoom lens, which comprises, in order from an object side thereof: a first lens group of negative refracting power, a second lens group of positive refracting power, a third lens group of negative refracting power, and a fourth lens group of positive refracting power, wherein: upon zooming from a wide-angle end to a telephoto end of the zoom lens, a separation between the respective lens groups changes, upon focusing from a focusing-on-infinity state to a close-range focusing state, the third lens group moves in an optical axis direction, and the conditions (1) and (2) are satisfied at the wide-angle end.

Abstract: The invention provides a zoom lens, characterized by comprising, a zoom lens, which comprises, in order from an object side thereof: a first lens group of negative refracting power, a second lens group of positive refracting power, a third lens group of negative refracting power, and a fourth lens group of positive refracting power, wherein: upon zooming from a wide-angle end to a telephoto end of the zoom lens, a separation between the respective lens groups changes, upon focusing from a focusing-on-infinity state to a close-range focusing state, the third lens group moves in an optical axis direction, and the conditions (1) and (2) are satisfied at the wide-angle end.

Abstract: The zoom lens of the invention comprises, in order from an object side thereof, a first lens group having positive refracting power, a second lens group having negative refracting power, a third lens group having positive refracting power, a fourth lens group having positive refracting power, a fifth lens group having negative refracting power, and a sixth lens group having positive refracting power. The first lens group includes a reflective optical element, and the lens component in, and on the most image side of, the fourth lens group has negative refracting power.

Abstract: The invention provides a zoom lens, characterized by comprising, in order from an object side thereof, a first lens group of positive refracting power, a second lens group of negative refracting power, a third lens group of positive refracting power, and a fourth lens group of negative refracting power, upon zooming from a wide-angle end to a telephoto end of the zoom lens, a separation between the respective lens group changes, a separation between the first lens group and the second lens group becomes narrow, and a separation between the second lens group and the third lens group grows wide; upon focusing from a focusing-on-infinity state to a close-range focusing state, the fourth lens group moves in an optical axis direction; and Conditions (1) and (2) are satisfied at the wide-angle end.

Abstract: A zoom lens comprises in order from an object side a first lens unit having a positive refractive power. The first lens unit consist one positive lens. The zoom lens satisfies the following conditional expressions (1) and (2). Fno(W)<2.7??(1) 3.1<ft/fw where, Fno(W) denotes an F-number of the zoom lens at a wide angle end, ft denotes a focal length at a telephoto end of the overall zoom lens system, and fw denotes a focal length at the wide angle end of the overall zoom lens system.