Patent ID: 9088724
Filing Date: 2015-07-21
Classification: G02B,H04N

Abstract:
1. A zoom lens comprising, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; and a fourth lens unit having a negative refractive power, wherein during zooming from a wide angle end to a telephoto end, a distance between the first lens unit and the second lens unit, a distance between the second lens unit and the third lens unit, and a distance between the third lens unit and the fourth lens unit vary, in zooming from the wide angle end to the telephoto end, the first lens unit is located closer to the object side at the telephoto end than at the wide angle end, the first lens unit consists of two lenses including a negative lens and a positive lens, the first lens unit has at least one aspheric surface in an optical path, and the zoom lens satisfies the following conditional expression (1): where L TLt is a distance on an optical axis from a refracting surface closest to the object side in an entire zoom lens system to an image plane at the telephoto end, β rear is the absolute value of a lateral magnification of a composite optical system from the second lens unit to the image plane at the telephoto end, and F LG1 is the focal length of the first lens unit.