| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens that corresponds to a large-sized sensor and has a satisfactorily corrected chromatic aberration of magnification over an entire zoom range even with a high zooming ratio.SOLUTION: A zoom lens includes, in order from an object side: a positive first lens group stationary during zooming; a negative second lens group moving during zooming; a lens group having one or more groups moving during zooming; a stationary final lens group Ur closest to an image side during zooming; and an aperture diaphragm disposed closer to the image side than the second lens group. The zoom lens appropriately sets: an Abbe number for each of a positive lens and a negative lens constituting the second lens group; an average value of partial dispersion ratios; abnormal dispersibility of a lens Lrn 1 having a smallest Abbe number from among negative lenses constituting the final lens group Ur; a distance on the optical axis from a surface apex position of a lens surface closest to the object side in the zoom lens to a surface apex position of a lens surface closest to the image side in the zoom lens; and a distance from the aperture diaphragm at a wide angle end to the negative lens.SELECTED DRAWING: Figure 1 |
