Photographing lens
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorTetsuya Abe
Life of this patent
Estimating the term…
Abstract
A photographing lens includes a first lens group, a diaphragm, and a positive second lens group, in this order from the object side. The photographing lens satisfies the following relationships: .vertline.f/f.sub.1 .vertline.<0.2, and 0.7<h.sub.I-1 /h.sub.I-L <1.0. In the above relationships, "f" designates the focal length of the entire photographing lens, "f.sub.1 " the focal length of the first lens group, "h.sub.I-1 " the height of the incident point of paraxial rays on axis on the first surface of the first lens group, and "h.sub.I-L " the height of the incident point of paraxial on-axis rays on the last surface of the first lens group, respectively.
Claims3
A photographing lens comprising a first lens group, a diaphragm, and a positive second lens group, in this order from the object side, wherein said photographing lens satisfies the relationships defined by the following:
- .vertline.f/f.sub.1 .vertline.<0.2
- 0.7<h.sub.I-1 /h.sub.I-L <1.0
- wherein
- f represents the focal length of the entire optical system of the photographing lens,
- f.sub.1 represents the focal length of the first lens group,
- h.sub.I-1 represents the height of the incident point of paraxial on axis rays from the optical axis on the first surface of the first lens group, and
- h.sub.I-L represents the height of the incident point of said paraxial on axis rays from the optical axis on the last surface of the first lens group.
Dependencies are inferred from the claim text.