Patent ID: 8019211

Claim:
A zoom lens system comprising: an aperture diaphragm; a lens unit having negative optical power and being closest to the object side; a lens unit arranged on the object side relative to the aperture diaphragm and being adjacent to the aperture diaphragm, the lens unit that is arranged on the object side relative to the aperture diaphragm and is adjacent to the aperture diaphragm being arranged on the image side relative to the lens unit that is closest to the object side; and a lens unit arranged on the image side relative to the aperture diaphragm and being adjacent to the aperture diaphragm, wherein at the time of zooming, interval between the aperture diaphragm and the lens unit arranged on the object side relative to the aperture diaphragm and being adjacent to the aperture diaphragm varies, and interval between the aperture diaphragm and the lens unit arranged on the image side relative to the aperture diaphragm and being adjacent to the aperture diaphragm varies.