| CPC G02B 15/1461 (2019.08) [G02B 15/16 (2013.01)] | 18 Claims |
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1. A zoom lens comprising, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a rear group including at least four lens units that move during zooming,
wherein distances between adjacent lens units change during zooming,
wherein the first lens unit is fixed relative to an image plane during zooming and during focusing,
wherein the first lens unit includes at least three lenses having positive refractive powers, and
wherein the following inequalities are satisfied:
7.50<Lw/fw<15.00
0.20<T2/|f2|<0.85
0.20<skw/fw<1.13
−2.00<β2t<−0.30
where Lw is a distance on an optical axis from a surface vertex position of a surface closest to an object in the zoom lens at a wide-angle end to the image plane, fw is a focal length of the zoom lens at the wide-angle end, T2 is a distance on the optical axis from a surface vertex position of a surface closest to the object of the second lens unit to a surface vertex position of a surface closest to the image plane of the second lens unit, and f2 is a focal length of the second lens unit, skw is a distance on the optical axis from a surface vertex position of a surface closest to the image plane of the zoom lens to the image plane at the wide-angle end, and β2t is a lateral magnification of the second lens unit at a telephoto end.
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