Patent ID: 7289152
Filing Date: 2007-10-30
Classification: G02B

Abstract:
1. An electronic image pickup system comprising a zoom lens and an electronic image pickup device located on an image plane side of said zoom lens, wherein said zoom lens comprises, in order from an object side of the zoom lens, a first lens group comprising two lens components and having negative power as a whole and a second lens group comprising two lens components and having positive power as a whole wherein an air space between said first lens group and said second lens group is varied to vary focal length of the zoom lens, a total number of lens groups in the zoom lens is only two of the first lens group and the second lens group, a total number of lens components in the first lens group is two, a total number of lens components in the second lens group is two, wherein each of said lens components in the first lens group and the second lens group is a single lens, and at least one of the following conditions (a), (f), (l) and (m) are satisfied: where A is equal to 43.2/L wherein L is a diagonal length of an effective image pickup area of the electronic image pickup device, d f R