Sony Corporation

Kazuki Yonemoto

Sota Miyatani

Koji Toyoda

Atsuo Minato

Hiroshi Omichi

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 satisfies15.0&#x3c;&#x3c;31.0&#x2003;&#x2003;(1)7.0&#x3c;1/&#x3c;13.0&#x2003;&#x2003;(2)&#x2212;8.5&#x3c;1/&#x3c;&#x2212;4.0&#x2003;&#x2003;(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.

Zoom lens and image pickup apparatus

An inner focus type zoom lens includes a first lens group that has positive refracting power and is normally located at a fixed position, a second lens group that has negative refracting power and is movable in an optical axis direction for zooming, a third lens group that has positive refracting power, a fourth lens group that is movable for correction of a focal position due to the zooming and for focusing, and a fifth lens group that has positive refracting power, in order from an object side, wherein the first lens group includes a negative lens, a first positive lens, and a second positive lens arranged in order from the object side, wherein a first face of the negative lens has a shape of a concave surface turned on the object side, and wherein the zoom lens satisfies the following conditional equation (1) &#x2212;10.0&#x3c;GR/fw&#x3c;&#x2212;3.0.

Growing community of inventors

Saitama, Japan

Kazuki Yonemoto