| 摘要 |
PROBLEM TO BE SOLVED: To provide a close range correction lens system obtaining excellent optical performance by correcting an aberration fluctuation well from infinite range to close range (photographic magnification at 0.5 times or more) while simplifying and downsizing a focusing mechanism system as well as suppressing the aberration fluctuation when a vibration-proof lens group is eccentric (especially in the aberration fluctuation outside an axis such as field curvature or magnification color aberration).SOLUTION: A close range correction lens system is composed of a first lens group with positive refractive power and a second lens group with negative refractive power in this order from an object side and the first lens group and the second lens group move to the object side at respectively different amounts of movement when focusing from an infinite object to a close range object. In this case, the close range correction lens system is characterized by: composing the first lens group from a 1a lens group with positive refractive power, a 1b lens group with negative refractive power, an aperture diaphragm and a 1c lens group with positive refractive power in this order from the object side; and having the 1b lens group be an image shaking correction lens group for correcting image shaking by varying a focal position by moving in the direction orthogonal to the optical axis. |
