| 摘要 |
PROBLEM TO BE SOLVED: To provide an inner focus type lens that is small in a diameter and has an excellent image-formation performance by suppressing an amount of movement toward an almost vertical direction with respect to an optical axis of a tremor-proof group upon a tremor-proof correction.SOLUTION: An inner focus type lens includes, arranged in order from an object side,: a first lens group Gthat has positive refractive power; a second lens group Gthat has negative refractive power; a third lens group Gthat has the positive refractive power. The second lens group Gis moved along an optical axis from the object side to an image-formation plane IMG side to thereby perform focusing from a state having infinity focused to a state having the closest distance focused. Further, a positive lens Lin the first lens group Gis moved to the almost vertical direction with respect to the optical axis to thereby perform a tremor-proof correction. Then, a prescribed condition is satisfied. Thus, the inner focus type lens can be achieved that is suitable for a downsized camera including a motion image shooting function with a small diameter and an excellent image-formation performance.SELECTED DRAWING: Figure 1 |
