Large aperture telephoto lens system
US3997248A · kind A · utility
13Cited by
1References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 13, 1975 |
| Grant date | Dec 14, 1976 |
| Priority date | — |
| Expiry date | Feb 13, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A large-aperture telephoto lens system with high telephoto ratio wherein a negative thick meniscus lens is arranged in the rear lens group for correcting the negative spherical aberration and negative coma which are produced by the positive meniscus lenses with high refractive indices positioned on the object side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.