| 主权项 |
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 lens group having a plurality of lens units at least one of which has positive refractive power, wherein the distance between the first lens unit and the second lens unit is greater at a telephoto end as compared to at a wide angle end, wherein the first lens unit includes a positive lens and a negative lens, wherein the rear lens group includes a lens unit R comprising a positive lens and a negative lens, the lens unit R having the highest zoom ratio among the lens units included in the rear lens group, and wherein the conditional expressions
5.0<νd1n<27.05.0<νdRn<27.0θgF1n<2.381×10−4·νd1n2−1.448×10−2·νd1n+0.8223θgFRn<2.381×10−4·νdRn2−1.448×10−2·νdRn+0.8223−0.00150<(θgF1n−θgF1p)/(νd1n−νd1p)−0.00150<(θgFRn−θgFRp)/(νdRn−νdRp) are satisfied, where of the positive lenses included in the first lens unit,
νd1p represents the Abbe number of the material of the positive lens of which the Abbe number of the lens material is the greatest, andθgF1p represents the partial dispersion ratio thereof, of the negative lenses included in the first lens unit,
νd1n represents the Abbe number of the material of the negative lens of which the Abbe number of the lens material is the smallest, andθgF1n represents the partial dispersion ratio thereof, of the positive lenses included in the lens unit R,
νdRp represents the Abbe number of the material of the positive lens of which the Abbe number of the lens material is the greatest, andθgFRp represents the partial dispersion ratio thereof, and of the negative lenses included in the lens unit R,
νdRn represents the Abbe number of the material of the negative lens of which the Abbe number of the lens material is the smallest, andθgFRn represents the partial dispersion ratio thereof. |
