Patent ID: 7446804

Claim:
A camera system comprising: a zoom lens; phototaking means converting an image captured by said zoom lens into an electric image signal; and image control means, wherein: said image control means is configured so as to form a new image signal subjected to coordinate conversion by shifting a point on an image defined by an image signal formed through said phototaking means, while referring to a conversion coordinate factor previously provided in response to a variable power rate through said zoom lens, and then output the new image signal, said zoom lens is made up of a first lens group having positive refracting power, a second lens group having negative refracting power, a third lens group having positive refracting power, a fourth lens group having negative refracting power, and a fifth lens group having positive refracting power, which are disposed in this order from an object side, and is configured so that the first lens group, the third lens group, and the fifth lens group are stationary; the second lens group is shifted in an optical axis direction to mainly perform variable power; and the fourth lens group is shifted in the optical axis direction to perform correction for image position fluctuations and focusing, and said first lens group is configured by disposing, in order from the object side, a concave lens group made up of one or more lenses; a convex lens with a strong convexity facing toward an image side; a cemented lens including a concave lens and a convex lens having an Abbe number vd not less than 84; and a convex lens with a strong convexity facing toward the object side, wherein a surface making contact with the air of said cemented lens and at least one surface of said convex lens closest to the image side are composed of an aspheric surface.