| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens which has high resolving power in all the photographing range, whose entire length is short, and which is compact and has high variable power, and to provide an imaging apparatus. SOLUTION: The zoom lens 1 includes a 1st lens group 10 having positive refractive power, a 2nd lens group 20 having negative refractive power, a 3rd lens group 30 having positive refractive power, and a 4th lens group 40 having positive refractive power in order from an object side. The 1st lens group 10 and the 3rd lens group 30 are fixed and the 2nd lens group 20 moves to an image surface side so as to perform variable power, and the 4th lens group 40 corrects image surface variation associated with the variable power by moving, and also performs focusing by moving. The 2nd lens group 20 is equipped with a meniscus negative lens 21 turning a concave surface to an image surface side, a negative lens 22, a positive lens 23 and a negative lens 24 in order from the object side. The zoom lens 1 satisfies 0.23≤absolute value (f2/(fw*ft)<SP>1/2</SP>)≤0.40 and 7≤(Σd+fb)/2YD≤10. The zoom lens 1 is mounted on the imaging apparatus. COPYRIGHT: (C)2006,JPO&NCIPI |
