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31
`CLAIMS
`
`1.
`
`A zoom lens system comprising:
`
`a first lens group having positive power;
`
`a second lens group having negative power;
`
`a third lens group having positive power;
`
`a fourth lens group having negative power; and
`
`a fifth lens group having positive power,
`
`the first, second, third, fourth, and fifth lens groups being arrangedin this order such that
`
`the first lens group is located closer to an object than any of the second, third, fourth or fifth
`
`lens
`
`group is, and that the fifth lens group is located closer to an image than any of the first, second,
`
`third, or fourth lens group is, wherein
`
`the first lens group is comprised ofa singlelens,
`
`the second lens group is comprised of four lenses,
`
`while the zoom lens system is zooming from a wide-angle end toward a telephoto end
`
`during a shooting session, the fifth lens group does not move but the first, second, third, and fourth
`
`lens groups moveto changeintervals between all of the first, second, third, fourth, and fifth lens
`
`groups.
`
`2.
`
`The zoom lens system of claim 1, wherein
`
`the second lens group includes a negative lens L2d whichis located closer to the image
`
`than any other memberof the secondlens groupis.
`
`3.
`
`The zoom lens system of claim 2, wherein
`
`the second lens group is comprisedof:
`
`a negative lens L2a;
`
`a negative lens L2b;
`
`a positive lens L2c; and
`
`the negative lens L2d,
`
`the negative lens L2a, the negative lens L2b, the positive lens L2c, and the negative lens
`
`L2d being arrangedin this order such that the negative lens L2a is located closer to the object than
`
`any of the negative lens L2b, the positive lens L2c, or the negative lens L2dis and that the negative
`
`lens L2d is located closer to the image than any of the negative lens L2a, the negative lens L2b, or
`
`the positive lens L2cis.
`
`

`

`32
`
`4.
`
`The zoom lens system of claim 3, wherein
`
`the zoom lens system satisfies the following Inequality (1):
`
`vL2b > 62
`
`(1)
`
`where vL2b is an abbe numberwith respect to a d—line of the negative lens L2b.
`
`5.
`
`The zoom lens system of claim 1, wherein
`
`the second lens group includes a negative lens L2a whichis located closer to the object
`
`than any other memberof the secondlens groupis,
`
`the zoom lens system satisfies the following Inequality (2):
`
`nL2a> 1.9
`
`(2)
`
`where nL2ais a refractive index with respect to a d-line of the negative lens L2a.
`
`6.
`
`The zoom lens system of claim 1, wherein
`
`the third lens group is comprisedof:
`
`a positive lens L3a;
`
`a positive lens L3b;
`
`a negative lens L3c; and
`
`a positive lens L3d,
`
`the positive lens L3a, the positive lens L3b, the negative lens L3c, and the positive lens
`
`L3d being arrangedin this order such that the positive lens L3a is located closer to the object than
`
`any of the positive lens L3b, the negative lens L3c, or the positive lens L3d is and that the positive
`
`lens L3d is located closer to the image than any ofthe positive lens L3a, the positive lens L3b, or
`
`the negative lens L3c is, and
`
`the zoom lens system satisfies the following Inequality (3):
`
`vL3d > 62
`
`(3)
`
`where vL3d is an abbe number with respect to a d—line of the positive lens L3d.
`
`7.
`
`The zoom lens system of claim 1, wherein
`
`the zoom lens system satisfies the following Inequality (4):
`
`0.5 < |f4/fT| < 1.1
`
`(4)
`
`where f4 is a focal length of the fourth lens group andfT is a focal length of the entire zoom lens
`
`system at the telephoto end.
`
`8.
`
`The zoom lens system of claim 1, wherein
`
`

`

`33
`the zoom lens system satisfies the following Inequality (5):
`
`0.5 < f5/f1 < 1.0
`
`(5)
`
`wheref1 is a focal length of the first lens group and f5 is a focal length of the fifth lens group.
`
`9.
`
`The zoom lens system of claim 1, wherein
`
`the fifth lens group is comprised of a single lens L5a, and
`
`the zoom lens system satisfies the following Inequality (6):
`
`1.8<nL5a
`
`(6)
`
`where nLSa is a refractive index with respect to a d—line of the single lens LS5a.
`
`10.
`
`The zoom lens system of claim 1, wherein
`
`the fifth lens group is comprised of a single lens L5a, and
`
`the zoom lens system satisfies the following Inequality (7):
`
`-8.5 <(L5aR1 + LSaR2) / (L5aR2 — LSaR1)
`
`(7)
`
`where LSaR1 is a radius of curvature of a surface, facing the object, of the single lens L5a and
`
`L5aR2 is a radius of curvature of a surface, facing the image, of the single lens LSa.
`
`11.
`
`A camera system comprising:
`
`an interchangeable lens unit including the zoom lens system of claim 1; and
`
`a camera body configured to be connected removably to the interchangeable lens unit via
`
`a camera mount and including an image sensor configured to receive an optical image formed by
`
`the zoom lens system and transform the optical image into an electrical imagesignal,
`
`the interchangeable lens unit forming the optical image of the object on the image sensor.
`
`12.
`
`An image capture device configured to transform an optical image of an object into an
`
`electrical image signal and display and/or store the image signal transformed, the image capture
`
`device comprising:
`
`the zoom lens system of claim 1 configured to form the optical image of the object; and
`
`an image sensor configured to transform the optical image formed by the zoom lens
`
`system into the electrical imagesignal.
`
`

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