| CPC G02B 15/145125 (2019.08) [G02B 15/1461 (2019.08); G02B 15/167 (2013.01); G02B 15/20 (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 a positive refractive power and configured not to move for zooming;
at least three movable lens units configured to move so that a distance between each pair of adjacent lens units therein changes for zooming; and
a final lens unit disposed closest to the image side in lens units included in the zoom lens, having a positive refractive power, and configured not to move for zooming,
wherein a movable lens unit closest to the image side in the at least three movable lens units has a positive refractive power, and a movable lens unit second closest to the image side in the at least three movable lens units has a negative refractive power,
wherein the first lens unit includes:
a first sub unit closest to the object side and configured not to move for focusing; and
a second sub unit configured to move for focusing,
wherein the final lens unit includes a positive lens closest to the image side in elements having a refractive power in the final lens unit, and
wherein following inequalities are satisfied:
80≤vdp≤81.54,
2.24≤Ndp+0.01vdp,
4≤Z≤50, and
2.5≤Le/fw≤5.46
where vdp represents an Abbe number with respect to a d-line of the positive lens, Ndp represents a refractive index with respect to the d-line of the positive lens, Z represents a zoom ratio of the zoom lens, Le represents a distance on an optical axis from a lens surface closest to the object side in the final lens unit to an image side surface of the positive lens in the final lens unit, and fw represents a focal length of the zoom lens at a wide-angle end.
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