Fish eye lens system
OwnerRolf Mullerinventor
Life of this patent
Estimating the term…
Abstract
A high performance medium speed fish eye lens system is provided, capable of compensating all aberrations except the distortion at an aperture ratio of at least 1:4.2. The lens system consists of a first lens group (G1) of negative refractive power including two negative lenses curved towards the object, a middle positive lens component (G2) curved towards the object, which lens component can be composed of a cemented doublet, and a last lens group (G3) of positive refractive power consisting of a cemented doublet or a cemented doublet and an additional positive single lens both curved towards the image.
Claims15
A six element fish eye lens system comprising from the object to the image side:
- a first meniscus shaped lens (L1) of negative refractive power curved towards the object,
- a second lens (L2) of negative refractive power curved towards the object,
- a third positive meniscus lens (L3) of positive refractive power curved towards the object,
- an aperture stop (B),
- a fourth lens (L4) of positive refractive power curved towards the image,
- a fifth meniscus shaped lens (L5) of negative refractive power curved towards the image, which lens (L5) is cemented with the fourth lens (L4), and
- a sixth meniscus shaped positive lens (L6) curved towards the image.
A six element fish eye lens system comprising from the object to the image side:
- a first meniscus shaped lens (L1) of negative refractive power curved towards the object,
- a second lens (L2) of negative refractive power curved towards the object,
- a first cemented doublet (L3;L4;
- C2) of positive refractive power curved towards the object,
- an aperture stop (B), and
- a second cemented doublet (L5;L6;
- G3) of positive refractive power curved towards the image.
Dependencies are inferred from the claim text.