JPS5565918A - Front iris large-aperture lens - Google Patents
Front iris large-aperture lensInfo
- Publication number
- JPS5565918A JPS5565918A JP14018878A JP14018878A JPS5565918A JP S5565918 A JPS5565918 A JP S5565918A JP 14018878 A JP14018878 A JP 14018878A JP 14018878 A JP14018878 A JP 14018878A JP S5565918 A JPS5565918 A JP S5565918A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- group
- conditions
- curvature
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
PURPOSE:To obtain the lens whose brightness is F2 or more and whose various aberrations are well corrected by providing a luminous flux defining member in front of the lens of the 3-group constitution formed by the specified four lenses and letting optical specifications satisfy the specified conditions. CONSTITUTION:A luminous flux defining member 10 is disposed on the subject side and the large-aperture lens of a focal length F is so constituted as to satisfy the conditions of formulas I-II by the 3-groups 4-elements of the positive single lens of a radius of curvature r1 at the front face forming the 1st group 1 of a combined focal length f1, the 2nd group 2 formed by a biconcave lens which is r2 in the radius of curvature of the rear face and is aspherical in the radius of curvature of the front face and the 3rd group 3 formed by a negative lens and a biconvex lens of a refractive index N4 and Abbe number nu4. The production of spherical aberrations is limited by the conditions of these formulas I, II, various averrations are well corrected by the conditions of formulas III-V, chromatic aberrations by the conditions of formula IV and the effect of flare by formula VII, whereby the large-aperture lens of brightness F2 or more and angle of view 45 deg. or more is provided. Here, phi2' denotes the composite refracting power of the air lens formed by the groups 2, 3 and d the axial air spacing of each group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14018878A JPS5565918A (en) | 1978-11-13 | 1978-11-13 | Front iris large-aperture lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14018878A JPS5565918A (en) | 1978-11-13 | 1978-11-13 | Front iris large-aperture lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5565918A true JPS5565918A (en) | 1980-05-17 |
Family
ID=15262946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14018878A Pending JPS5565918A (en) | 1978-11-13 | 1978-11-13 | Front iris large-aperture lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5565918A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5918916A (en) * | 1982-07-23 | 1984-01-31 | Canon Inc | Tessar type photographic lens |
| US5172272A (en) * | 1989-12-25 | 1992-12-15 | Olympus Optical Co., Ltd. | Imaging lens system |
| KR100463479B1 (en) * | 2001-01-31 | 2004-12-29 | 가시오게산키 가부시키가이샤 | Photographing lens system |
-
1978
- 1978-11-13 JP JP14018878A patent/JPS5565918A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5918916A (en) * | 1982-07-23 | 1984-01-31 | Canon Inc | Tessar type photographic lens |
| JPH0415923B2 (en) * | 1982-07-23 | 1992-03-19 | Canon Kk | |
| US5172272A (en) * | 1989-12-25 | 1992-12-15 | Olympus Optical Co., Ltd. | Imaging lens system |
| KR100463479B1 (en) * | 2001-01-31 | 2004-12-29 | 가시오게산키 가부시키가이샤 | Photographing lens system |
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