JPS5786813A - Rear attachment lens - Google Patents
Rear attachment lensInfo
- Publication number
- JPS5786813A JPS5786813A JP16276780A JP16276780A JPS5786813A JP S5786813 A JPS5786813 A JP S5786813A JP 16276780 A JP16276780 A JP 16276780A JP 16276780 A JP16276780 A JP 16276780A JP S5786813 A JPS5786813 A JP S5786813A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- diaphragm
- view
- luminous flux
- rear attachment
- 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
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/02—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective
- G02B15/10—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by adding a part, e.g. close-up attachment
Abstract
PURPOSE:To improve imaging performance at an intermediate angle of view by providing a variable aperture diaphragm near the 1st lens on the object side of a rear attachment lens and stopping down the variable aperture diaphragm in interlocking with the diaphragm of a photographic lens. CONSTITUTION:A variable aperture diaphragm P is arranged right in front of the 1st lens on the object side of a rear attachment lens B and when the diaphragm V of a photographic lens A is stopped down from an open aperture to an intermediate aperture, it is also stopped down in interlocking with the V. In this case, the aperture of the variable aperture diaphragm P so determines to limit luminous flux L2 at a maximum angle of view without limiting luminous flux L on an axis determining an F number, and the quantity of peripheral light is not reduced. Consequently, only luminous flux L1', which becomes a flare component, of luminous flux at an intermediate angle of view is removed efficiently, improving imaging performance at the intermediate angle of view.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16276780A JPS5786813A (en) | 1980-11-19 | 1980-11-19 | Rear attachment lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16276780A JPS5786813A (en) | 1980-11-19 | 1980-11-19 | Rear attachment lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5786813A true JPS5786813A (en) | 1982-05-31 |
Family
ID=15760830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16276780A Pending JPS5786813A (en) | 1980-11-19 | 1980-11-19 | Rear attachment lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5786813A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5725052A (en) * | 1993-10-01 | 1998-03-10 | Nippondenso Co., Ltd. | Dual zone air-conditioning system for motor vehicles with improved air flow rate |
| JP2002267929A (en) * | 2001-03-07 | 2002-09-18 | Canon Inc | Rear converter lens and optical equipment using the same |
| JP2015152618A (en) * | 2014-02-10 | 2015-08-24 | オリンパス株式会社 | Teleconverter and imaging system including the same |
-
1980
- 1980-11-19 JP JP16276780A patent/JPS5786813A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5725052A (en) * | 1993-10-01 | 1998-03-10 | Nippondenso Co., Ltd. | Dual zone air-conditioning system for motor vehicles with improved air flow rate |
| JP2002267929A (en) * | 2001-03-07 | 2002-09-18 | Canon Inc | Rear converter lens and optical equipment using the same |
| JP4695768B2 (en) * | 2001-03-07 | 2011-06-08 | キヤノン株式会社 | Rear converter lens and optical apparatus using the same |
| JP2015152618A (en) * | 2014-02-10 | 2015-08-24 | オリンパス株式会社 | Teleconverter and imaging system including the same |
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