Patent ID: 9557542
Date: 2017-01-31
CPC Classifications: G02B,H04N

Claim:
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 the fourth lens unit includes at least two lenses, and at the time of zooming from a wide angle end to a telephoto end, a distance between the first lens unit and the second lens unit widens, a distance between the second lens unit and the third lens unit narrows, and a distance between the third lens unit and the fourth lens unit fluctuates, and the total number of lens units included in the zoom lens is four, and the first lens unit, after moving toward the image side, moves toward the object side, wherein the following conditional expression (1) is satisfied: where, β β each of β