ZOOM LENS AND IMAGING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a small sized zoom lens making good correction of image surface variation due to varying of power and aberration generating in image blur correction and obtaining high optical performance while having high variable power ratio.

SOLUTION: The zoom lens includes: a positive first lens group G1; a negative second lens group G2; a positive third lens group G3; and a positive fourth lens group G4. A diaphragm SP is arranged between the second lens group G2 and the third lens group G3. The third lens group G3 is composed of a positive 3A lens sub-group G3A and a negative 3B lens sub-group G3B. The 3A lens sub-group G3A is composed of a positive lens L31 and a negative lens L32 and at least one surface of the 3A lens sub-group G3A has an aspherical surface. The 3B lens sub-group G3B includes a positive lens L33 and a negative lens L34. The relationship of 0.153A/ft<0.35 is satisfied and the image blur is corrected by shifting of the 3A lens sub-group G3A when a composite focal distance of the 3A lens sub-group is f3Aand the composite focal distance of the whole system on the telephoto end is ft.

COPYRIGHT: (C)2012,JPO&INPIT