JP2006084739A5 - - Google Patents
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- JP2006084739A5 JP2006084739A5 JP2004268960A JP2004268960A JP2006084739A5 JP 2006084739 A5 JP2006084739 A5 JP 2006084739A5 JP 2004268960 A JP2004268960 A JP 2004268960A JP 2004268960 A JP2004268960 A JP 2004268960A JP 2006084739 A5 JP2006084739 A5 JP 2006084739A5
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- Prior art keywords
- lens
- front teleconverter
- curvature
- object side
- radius
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Claims (8)
物体側から順に、正の屈折力を有する第１レンズ群と、負の屈折力を有する第２レンズ群とからなり、
前記第１レンズ群は、物体側から順に、物体側に凸面を向けた負メニスカスレンズと両凸形状の正レンズとの接合レンズと、物体側に凸面を向けた正メニスカスレンズとからなり、
前記第２レンズ群は、物体側から順に、正レンズと両凹形状の負レンズとの接合レンズからなり、
以下の条件式を満足することを特徴とするフロントテレコンバータレンズ。
８０＜νｄ２
８０＜νｄ３
ただし、
νｄ２：前記第１レンズ群における前記両凸形状の正レンズの媒質のｄ線（波長λ＝５８７．６ｎｍ）に対するアッベ数
νｄ３：前記第１レンズ群における前記正メニスカスレンズの媒質のｄ線（波長λ＝５８７．６ｎｍ）に対するアッベ数 A front teleconverter lens that is mounted on the object side of the photographic lens and has a combined focal length that is longer than the focal length of the photographic lens,
In order from the object side, the first lens group having a positive refractive power and a second lens group having a negative refractive power,
The first lens group includes, in order from the object side, a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a positive meniscus lens having a convex surface facing the object side.
The second lens group includes, in order from the object side, a cemented lens of a positive lens and a biconcave negative lens;
A front teleconverter lens that satisfies the following conditional expression:
80 <νd2
80 <νd3
However,
νd2: Abbe number to the d-line (wavelength λ = 587.6 nm) of the biconvex positive lens medium in the first lens group νd3: d-line (wavelength of the positive meniscus lens medium in the first lens group) Abbe number for λ = 587.6 nm)
０．７５＜（Ｒ２Ｒ＋Ｒ１Ｆ）／（Ｒ２Ｒ−Ｒ１Ｆ）＜１．１
４．５＜（Ｒ３Ｒ＋Ｒ３Ｆ）／（Ｒ３Ｒ−Ｒ３Ｆ）＜６．２
ただし、
Ｒ１Ｆ：前記第１レンズ群における前記接合レンズ中の最も物体側のレンズ面の曲率半径
Ｒ２Ｒ：前記第１レンズ群における前記接合レンズ中の最も像側のレンズ面の曲率半径
Ｒ３Ｆ：前記第１レンズ群における前記正メニスカスレンズの物体側のレンズ面の曲率半径
Ｒ３Ｒ：前記第１レンズ群における前記正メニスカスレンズの像側のレンズ面の曲率半径 The front teleconverter lens according to claim 1, wherein the following conditional expression is satisfied.
0.75 <(R2R + R1F) / (R2R−R1F) <1.1
4.5 <(R3R + R3F) / (R3R-R3F) <6.2
However,
R1F: radius of curvature of the lens surface closest to the object side in the cemented lens in the first lens group R2R: radius of curvature of the lens surface closest to the image side in the cemented lens in the first lens group R3F: radius of curvature of the first lens Radius of curvature R3R of the object-side lens surface of the positive meniscus lens in the lens group: radius of curvature of the image-side lens surface of the positive meniscus lens in the first lens group
νｄ４＜２５
ただし、
νｄ４：前記第２レンズ群における前記正レンズの媒質のｄ線（波長λ＝５８７．６ｎｍ）に対するアッベ数 The front teleconverter lens according to claim 1, wherein the following conditional expression is satisfied.
νd4 <25
However,
νd4: Abbe number with respect to d-line (wavelength λ = 587.6 nm) of the medium of the positive lens in the second lens group
−１．２０＜（Ｒ５Ｒ＋Ｒ４Ｆ）／（Ｒ５Ｒ−Ｒ４Ｆ）＜−０．７５
ただし、
Ｒ４Ｆ：前記第２レンズ群における前記正レンズの物体側のレンズ面の曲率半径
Ｒ５Ｒ：前記第２レンズ群における前記両凹形状の負レンズの像側のレンズ面の曲率半径 The front teleconverter lens according to any one of claims 1 to 3, wherein the following conditional expression is satisfied.
−1.20 <(R5R + R4F) / (R5R−R4F) <− 0.75
However,
R4F: radius of curvature of the object side lens surface of the positive lens in the second lens group R5R: radius of curvature of the image side lens surface of the biconcave negative lens in the second lens group
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004268960A JP4715141B2 (en) | 2004-09-15 | 2004-09-15 | Front teleconverter lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004268960A JP4715141B2 (en) | 2004-09-15 | 2004-09-15 | Front teleconverter lens |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2006084739A JP2006084739A (en) | 2006-03-30 |
| JP2006084739A5 true JP2006084739A5 (en) | 2008-01-17 |
| JP4715141B2 JP4715141B2 (en) | 2011-07-06 |
Family
ID=36163314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004268960A Active JP4715141B2 (en) | 2004-09-15 | 2004-09-15 | Front teleconverter lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4715141B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4898361B2 (en) * | 2006-09-12 | 2012-03-14 | キヤノン株式会社 | Teleconverter lens and imaging apparatus having the same |
| JP2008298856A (en) | 2007-05-29 | 2008-12-11 | Konica Minolta Opto Inc | Video projection device |
| KR101853807B1 (en) | 2010-06-01 | 2018-05-02 | 삼성전자주식회사 | Tele converter lens system and photographing apparatus |
| JP2014202986A (en) * | 2013-04-08 | 2014-10-27 | 株式会社ニコン | Teleconverter lens |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002082367A (en) * | 2000-06-22 | 2002-03-22 | Nikon Corp | Front teleconverter having vibration isolating function |
| JP4122790B2 (en) * | 2002-02-14 | 2008-07-23 | 株式会社ニコン | Front teleconverter lens |
| JP4161585B2 (en) * | 2002-02-14 | 2008-10-08 | 株式会社ニコン | Teleconverter lens |
| JP2004126060A (en) * | 2002-09-30 | 2004-04-22 | Nikon Corp | Teleconverter lens |
| JP2004126061A (en) * | 2002-09-30 | 2004-04-22 | Nikon Corp | Diffracting optical element and optical system using same |
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2004
- 2004-09-15 JP JP2004268960A patent/JP4715141B2/en active Active