Patent attributes
An optical apparatus is provided with a zoom optical system. The zoom optical system includes a lens unit located at the most object-side position and a moving lens unit with positive refracting power, located on the image side of the lens unit. The lens unit includes a single positive lens and the moving lens unit is simply moved toward the object side when the magnification of the zoom lens is changed in the range from a wide-angle position to a telephoto position so as to satisfy the following condition:0.8<y07/(fw·tan ω07w)<0.96where fw is the focal length of the entire system of the zoom lens at the wide-angle position, y07 is an image height expressed by 0.7×y10, where y10 is a distance from the center to a point farthest therefrom on the effective imaging surface of an electronic image sensor, and ω07w is an angle made by a direction of an object point with an optical axis, where the object point corresponds to an image point that is at the point y07 away from the center on the effective imaging surface of the electronic image sensor at the wide angle position.
