Patent Number: 8,797,656

Title: Zoom lens and image pickup apparatus

Abstract: A zoom lens includes, from the object side, a positionally-fixed first lens group having a positive refracting power, a second lens group having a negative refracting power and movable in an optical axis direction for zooming, a third lens group having a positive refracting power, and a fourth lens group movable in the optical axis direction. The first lens group includes a negative lens, a positive lens and another positive lens disposed in order from the object side and satisfies 15.0<ft/fw<31.0 (1) 7.0<f1/fw<13.0 (2) -8.5<fL1/fw<-4.0 (3) where fw and ft are the focal lengths of the entire lens system in a wide angle end state and a telephoto end state, respectively, f1 is the focal length of the first lens group, and fL1 is the focal length of the negative lens of the first lens group.

Inventors: Miyatani; Sota (Tokyo, JP), Yonemoto; Kazuki (Saitama, JP), Omichi; Hiroshi (Tokyo, JP), Minato; Atsuo (Kanagawa, JP)

Assignee: Sony Corporation

International Classification: G02B 15/14 (20060101); H04N 5/225 (20060101)

Expiration Date: 8/05/12018