US 12,259,534 B2
Zoom lens and optical apparatus
Makoto Nakahara, Utsunomiya (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jul. 16, 2020, as Appl. No. 16/931,022.
Claims priority of application No. 2019-138892 (JP), filed on Jul. 29, 2019.
Prior Publication US 2021/0033835 A1, Feb. 4, 2021
Int. Cl. G02B 15/20 (2006.01); G02B 13/00 (2006.01); G02B 13/02 (2006.01); G02B 15/177 (2006.01); G02B 27/00 (2006.01); H04N 23/69 (2023.01)
CPC G02B 15/177 (2013.01) [G02B 13/009 (2013.01); G02B 13/02 (2013.01); G02B 15/20 (2013.01); G02B 27/0025 (2013.01); H04N 23/69 (2023.01)] 22 Claims
OG exemplary drawing
 
1. A zoom lens comprising, in order from an object side to an image side,
a first lens unit having a positive refractive power;
a second lens unit having a negative refractive power; and
a rear group including a plurality of lens units,
wherein during zooming, each distance between adjacent lens units of the first, second and plurality of lens units change,
wherein the rear group includes an aperture stop and a negative lens unit disposed closest to an object side among at least one lens unit having a negative refractive power on the image side of the aperture stop,
wherein the rear group further includes a positive lens unit that is disposed between the second lens unit and the negative lens unit,
wherein the negative lens unit includes a positive lens, and
wherein the following conditions are satisfied:
−0.1000<θgFp−(−1.665×10−7×vdp3+5.213×10−5×vdp2−5.656×10−3×vdp+0.7268)<−0.0001
25<vdp<50
0.10<Dwp/Dtp<0.70
0<|MLp/M1|≤0.35
1.0<LDw/fw<3.5
where vdp is an Abbe number of the positive lens for the d-line, θgFp is a partial dispersion ratio of the positive lens for the g-line and the F-line, Dwp is a distance on an optical axis at a wide-angle end from a position of the aperture stop to a vertex of the positive lens on the object side, Dtp is a distance on the optical axis at a telephoto end from a position of the aperture stop to the vertex of the positive lens on the object side, M1 is a moving amount of the first lens unit relative to an image plane during zooming from the wide-angle end to the telephoto end, MLp is a moving amount of the positive lens unit relative to the image plane during zooming from the wide-angle end to the telephoto end, LDw is an overall optical length of the zoom lens at the wide-angle end, and fw is a focal length of the zoom lens at the wide-angle end.