Compact zoom lens system of a relatively high zoom ratio capable of providing a wide field angle

摘要

A compact zoom lens system capable of providing a high zoom ratio ranging to a wide field angle is provided. The zoom lens system utilizes four separate lens groups or units with the first lens group or unit being of a positive refractive power and the fourth lens group or unit being capable of axial movement for focusing. The zooming mode of operation is capable of being provided by the first three lens groups or units, while the fourth lens group or unit can be separated and, in fact, integrally mounted for a focusing movement in the camera body. Thus, interchangeable lens system without independent focusing can be positioned on the camera body.