Patent ID: 8643764
Filing Date: 2014-02-04
Classification: G02B

Abstract:
1. An image pickup apparatus having zoom lens comprising: a zoom lens having a first positive lens unit having a positive refractive power, and a first negative lens unit having a negative refractive power disposed on an object side of the first positive lens unit, and in which, a distance between the first positive lens unit and the first negative lens unit decreases at the time of zooming from a wide angle end to a telephoto end; and an electronic image pickup element having image pickup pixel rows which are arranged two-dimensionally at image positions formed by the zoom lens, wherein the zoom lens comprises: an aperture stop which is disposed between a lens nearest to an image side in the first negative lens unit and a lens nearest to the image side in the first positive lens unit; and a light-amount reducing filter made of a resin material, which is disposed on the image side of the lens nearest to the image side in the first positive lens unit, and which can be inserted in and withdrawn from the optical path, wherein the zoom lens and the electronic image pickup element satisfy the following conditional expressions (1), (2), (3), (4), and (5) where, n n t denotes a thickness on the optical axis, of the light-amount reducing filter, FNO f f P denotes an image pickup pixel pitch of the electronic image pickup element, and N denotes the maximum value of the number of image pickup pixels in an effective image pickup area of the electronic image pickup element.