GB673358A - Improvements in wide-angle objectives - Google Patents
Improvements in wide-angle objectivesInfo
- Publication number
- GB673358A GB673358A GB30323/50A GB3032350A GB673358A GB 673358 A GB673358 A GB 673358A GB 30323/50 A GB30323/50 A GB 30323/50A GB 3032350 A GB3032350 A GB 3032350A GB 673358 A GB673358 A GB 673358A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- focal length
- less
- positive
- radius
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/04—Reversed telephoto objectives
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
673,358. Objectives. ANGENIEUX, P. Dec. 12, 1950 [Feb. 17, 1950; July 5, 1950], No. 30323/50. Class 97 (i). A photographic objective in which the back focal length is greater than the equivalent focal length comprises a simple negative meniscus lens 1 convex towards the front and disposed at a distance greater than half the equivalent focal length F in front of a convergent member which consists of a simple positive lens 2, a simple positive meniscus lens 3 convex toward the front, a simple bi-concave lens 4 and a positive compound lens 5 and the focal length of said negative meniscus being less than 4F and the radius of curvature of the rear surface R2 of the negative meniscus being less than 1.5F. Preferably, the radius R2 is also less than the radius of curvature of the surface R3, and the axial thickness of the rear lens of the convergent member is greater than that of the air space between the bi-concave lens and said rear lens. Optical data are given for the example shown and for an example in which the rear compound lens is a triplet made up of a negative lens of flint glass cemented between two positive lenses of crown or barium crown glass and in which said bi-concave lens 4 is of material having a refractive index less than 1.58.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1013652T | 1950-02-17 | ||
| FR2696758X | 1952-05-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB673358A true GB673358A (en) | 1952-06-04 |
Family
ID=32299608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30323/50A Expired GB673358A (en) | 1950-02-17 | 1950-12-12 | Improvements in wide-angle objectives |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2696758A (en) |
| FR (3) | FR1013652A (en) |
| GB (1) | GB673358A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1102435B (en) * | 1958-09-12 | 1961-03-16 | Enna Werk Optik Apelt | Photographic wide-angle lens with extremely high light intensity |
| DE1278754B (en) * | 1959-08-12 | 1968-09-26 | Rank Precision Ind Ltd | Wide angle lens |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1040280B (en) * | 1955-02-08 | 1958-10-02 | Schneider Co Optische Werke | Bright photographic or cinematographic lens with variable focal length |
| DE1062028B (en) * | 1955-02-19 | 1959-07-23 | Enna Werk Optik Apelt | Photographic lens |
| FR1152789A (en) * | 1955-07-05 | 1958-02-25 | Schneider Co Optische Werke | Wide angle lens usable on photographic or cinematographic cameras |
| US2844997A (en) * | 1955-12-06 | 1958-07-29 | Zeiss Carl | Photographic objective |
| US3040624A (en) * | 1956-10-27 | 1962-06-26 | Canon Camera Co | Wide angle photographic objective |
| US3038379A (en) * | 1958-03-15 | 1962-06-12 | Schneider Co Optische Werke | High-speed photographic or cinemato-graphic objective with wide image angle |
| US3023672A (en) * | 1958-10-09 | 1962-03-06 | Bell & Howell Co | Wide angle objective |
| DE1209769B (en) * | 1963-12-04 | 1966-01-27 | Schneider Co Optische Werke | Photographic or cinematographic lens of high light intensity, especially for projection purposes |
| DE1447270A1 (en) * | 1964-05-30 | 1968-11-14 | Josef Schneider & Co | Photographic or cinematographic wide-angle lens with long focal length on the image side |
| JP2017513043A (en) | 2014-02-26 | 2017-05-25 | コーニング インコーポレイテッド | A method for setting tolerances on optical surfaces using local pupil regions |
| CA2953337C (en) | 2014-05-06 | 2023-04-11 | Zakariya NIAZI | Imaging system, method, and applications |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1863099A (en) * | 1929-10-30 | 1932-06-14 | Trans Lux Daylight Picture | Projection system and projection lens system therefor |
| US1955590A (en) * | 1930-07-12 | 1934-04-17 | Kapella Ltd | Lens |
| GB388215A (en) * | 1932-02-27 | 1933-02-23 | Horace William Lee | Improvements in lenses |
| US2594020A (en) * | 1949-06-25 | 1952-04-22 | Elgeet Optical Company Inc | Wide-angle photographic objective |
| US2548569A (en) * | 1949-11-04 | 1951-04-10 | Eastman Kodak Co | Reversed telephoto objective having a high-index positive front lens element |
| US2649022A (en) * | 1950-02-17 | 1953-08-18 | Angenieux Pierre | Wide-angle photographic objective lens assembly |
-
1950
- 1950-02-17 FR FR1013652D patent/FR1013652A/en not_active Expired
- 1950-07-05 FR FR60430D patent/FR60430E/en not_active Expired
- 1950-12-12 GB GB30323/50A patent/GB673358A/en not_active Expired
-
1952
- 1952-05-29 FR FR62932D patent/FR62932E/en not_active Expired
-
1953
- 1953-03-23 US US343980A patent/US2696758A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1102435B (en) * | 1958-09-12 | 1961-03-16 | Enna Werk Optik Apelt | Photographic wide-angle lens with extremely high light intensity |
| DE1278754B (en) * | 1959-08-12 | 1968-09-26 | Rank Precision Ind Ltd | Wide angle lens |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1013652A (en) | 1952-08-01 |
| US2696758A (en) | 1954-12-14 |
| FR60430E (en) | 1954-11-02 |
| FR62932E (en) | 1955-06-30 |
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