| CPC G02B 15/144113 (2019.08) [G02B 15/1461 (2019.08); G02B 15/145129 (2019.08); G02B 15/173 (2013.01); G02B 15/20 (2013.01)] | 8 Claims |
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1. A zoom lens consisting of in order from an object side to an image side:
a first lens unit having a positive refractive power and configured not to move for zooming;
three or four moving lens units configured to move in zooming;
an aperture stop; and
one or two rear lens units including a rear lens unit closest to the object side and configured not to move for zooming,
wherein an interval between each pair of adjacent lens units is changed in zooming,
wherein the three or four moving lens units include a moving lens unit having a negative refractive power,
wherein the three or four moving lens units include a rear positive lens unit closest to the image side and having a positive refractive power,
wherein the first lens unit includes three positive lenses, and
wherein following conditional expressions are satisfied:
1.0<Ea/Ep≤1.83;
0.4<β<1.5; and
2.5<ft/f1<5.2,
where β represents a lateral magnification of the one or two rear lens units at a wide-angle end in a case where an axial beam enters from infinity under a state in which the zoom lens is in focus at infinity, Ea represents a smallest effective diameter of effective diameters of lenses included in the rear positive lens unit, Ep represents a full open aperture diameter of the aperture stop, f1 represents a focal length of the first lens unit, and ft represents a focal length of the zoom lens at a telephoto end.
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