Photographic optical system and photographing apparatus having the same
AssigneeCanon Kabushiki Kaisha
InventorAkira Harada
Life of this patent
Estimating the term…
Abstract
A photographic optical system for forming an image on a rectangular effective photographing area includes a photographic lens, and an optical member disposed on an object side of the photographic lens, both surfaces on the object side and an image side of the optical member having curvature in the same direction, wherein the following conditions are satisfied: 2.5<|r/f|<100 f/L>4 where r is a smaller one of radii of curvature of the surfaces on the object side and the image side of the optical member, f is a focal length of the photographic optical system, and L is a diagonal length of the effective photographing area.
Claims5
A photographic optical system for forming an image on a rectangular effective photographing area, said photographic optical system comprising:
- a photographic lens;
- and
- an optical member disposed on an object side of said photographic lens, both surfaces on the object side and an image side of said optical member having curvature in the same direction,
- wherein the following conditions are satisfied:
- 2.5<|r/f|<100
- f/L>4
- where r is a smaller one of radii of curvature of the surfaces on the object side and the image side of said optical member, f is a focal length of said photographic optical system, and L is a diagonal length of the effective photographing area.
Dependencies are inferred from the claim text.