Patent ID: 7151638

Claim:
A zooming lens apparatus, comprising: a first optical lens group having a positive refractive power; a second optical lens group having a negative refractive power; an aperture diaphragm, the second optical lens group being arranged between the first optical lens group and the aperture diaphragm; a third optical lens group having a positive refractive power, the aperture diaphragm being arranged between the second optical lens group and the third optical lens group; a fourth optical lens group having a positive refractive power, the third optical lens group being arranged between the aperture diaphragm and the fourth optical lens group; and a frame assembly configured to support the first optical lens group, the second optical lens group, the third optical lens group, the fourth optical lens group, and the aperture diaphragm, the frame assembly being configured to move the first optical lens group and the third optical lens group in a first direction, and to move the fourth optical lens group in a second direction opposite to the first direction, when a scaling of the zooming lens apparatus is changed from a wide-angle limit to a telescopic limit, and the zooming lens apparatus satisfying an inequality condition 0.60<m 4T <0.85, where m 4T represents an imaging magnification of the fourth optical lens group at the telescopic limit.