Medium telephoto lens and imaging device

摘要

A first lens group having positive refractive power and a second lens group are arranged in this order from an object side, and only the first lens group moves in the optical axis direction while focusing. The first lens group substantially consists of a positive 1-1 lens, a positive 1-2 lens, a positive 1-3 lens, a negative 1-4 lens, an aperture stop, a negative 1-5 lens, a positive 1-6 lens, and a positive 1-7 lens. The 1-3 lens and the 1-4 lens are cemented to each other, and the 1-5 lens and the 1-6 lens are cemented to each other. The second lens group substantially consists of a negative 2-1 lens and a positive 2-2 lens. Only the first lens group moves in the optical axis direction while focusing.

主权项

1. A medium telephoto lens which substantially consists of a first lens group having positive refractive power and a second lens group in order from an object side,
wherein the first lens group substantially consists of a positive 1-1 lens with a convex surface toward the object side, a positive 1-2 lens with a convex surface toward the object side, a positive 1-3 lens with a convex surface toward the object side; a negative 1-4 lens with a concave surface toward an image side; an aperture stop, a negative 1-5 lens with a concave surface toward the image side, a positive 1-6 lens with a convex surface toward the object side, and a positive 1-7 lens with a convex surface toward the object side, in this order from the object side; the 1-3 lens and the 1-4 lens are cemented to each other and the 1-5 lens and the 1-6 lens are cemented to each other; the second lens group substantially consists of a negative 2-1 lens with a concave surface toward the image side and a positive 2-2 lens with a convex surface toward the object side; and only the first lens group moves in the optical axis direction while focusing.