ZOOM LENS AND IMAGING DEVICE

摘要

PROBLEM TO BE SOLVED: To make a zoom lens, whose variable power ratio is about 2 to 3, improved in image forming performance, small in size and low in cost. SOLUTION: The zoom lens is composed of a 1st negative lens group GR1, a 2nd positive lens group GR2 and a 3rd positive lens group GR3 in this order from an object side, and performs zooming by moving the 1st lens group GR1 and the 2nd lens group GR2. Assuming that a distance on an optical axis where space between the surface of the 1st lens group GR1 nearest to an image side and the surface of the 2nd lens group GR2 nearest to the object side is the smallest is D12, a distance from the lens surface nearest to the object side and that nearest to the image side of the 2nd lens group GR2 is D2G, optical entire length at a wide end is TLW and a focal distance at the wide end is fw, the zoom lens satisfies all expressions; (1) 0.02