Patent ID: 9116336
Filing Date: 2015-08-25
Classification: G02B

Abstract:
1. A zoom lens comprising, in order from the object side to the image side, a first lens unit having positive refractive power which does not move for zooming or focusing, a second lens unit having negative refractive power which moves during zooming, a third lens unit having positive refractive power which moves during zooming, a fourth lens unit having negative refractive power which moves during zooming and focusing, and a fifth lens unit having positive refractive power which does not move for zooming or focusing, wherein an aperture stop which does not move for zooming or focusing is arranged adjacent to the fourth lens unit, and the following conditions are satisfied: where f2, f3, and f4 are focal lengths of the second lens unit, the third lens unit, and the fourth lens unit respectively, Z