Patent ID: 6538824
Filing Date: 2003-03-25
Classification: G02B

Abstract:
An electronic image pickup system comprising a zoom lens system and an electronic image pickup device located in the rear of said zoom lens system, wherein:said zoom lens system comprises, in order from an object side of said zoom lens system, a first lens group having negative refracting power, a second lens group having positive refracting power and a third lens group having positive refracting power, upon focused on an object point at infinity, a separation between said second lens group and said third lens group becomes wide for zooming from a wide-angle end to a telephoto end of said zoom lens system, said zoom lens system is focused on a nearby subject by moving said the third lens group toward the object side, and said second lens group comprises, in order from an object side thereof, a first cemented lens component comprising a positive lens 2a and a negative lens 2b and a second lens group 2c consisting of a second cemented lens component, and satisfies the following condition (1): 0.042N/t2<0.18â€ƒâ€ƒ(1) â€ƒwhere t2N is an optical axis distance from an image-side surface of the positive lens 2a located on the object side of the second lens group to an image-side surface of the negative lens 2b in the second lens group, and t2 is an optical axis distance from an object-side surface of the positive lens 2a located on the object side of the second lens group to a surface located to an image side of the second lens group 2c.