JPS57197507A - Telephoto lens capable of focusing to macropickup region - Google Patents
Telephoto lens capable of focusing to macropickup regionInfo
- Publication number
- JPS57197507A JPS57197507A JP8338081A JP8338081A JPS57197507A JP S57197507 A JPS57197507 A JP S57197507A JP 8338081 A JP8338081 A JP 8338081A JP 8338081 A JP8338081 A JP 8338081A JP S57197507 A JPS57197507 A JP S57197507A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- positive
- negative
- focusing
- macropickup
- 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
- G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
PURPOSE:To make macropickup possible with a telephoto lens of 100-300mm. class, by constituting a lens system with three groups of positive, negative and positive from the front, and performing focusing through the movement of the 1st and 3rd lens groups in the front. CONSTITUTION:A lens system consists of the 1st lens group comprising two positive and negative lenses having a positive synthesized refractive force as a whole, the 2nd lens group comprising two negative and positive lenses having a negative synthesized refractive force as a whole, and the 3rd lens group comprising a negative and a positive lens having a positive synthesized refractive force as a whole. The 1st and 3rd lens groups are moved forward incorporatedly for focusing, and relation of 0.25<¦f2¦/F<1, 0.2<e1/f1<0.5 is satisfied, where f1 and f2 are focal lengths of the 1st and 2nd lens groups respectively, and F and e1 are interval between the focal length of the overall system at infinite focusing and the 1st and 2nd lens groups respectively.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8338081A JPS57197507A (en) | 1981-05-29 | 1981-05-29 | Telephoto lens capable of focusing to macropickup region |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8338081A JPS57197507A (en) | 1981-05-29 | 1981-05-29 | Telephoto lens capable of focusing to macropickup region |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57197507A true JPS57197507A (en) | 1982-12-03 |
Family
ID=13800808
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8338081A Pending JPS57197507A (en) | 1981-05-29 | 1981-05-29 | Telephoto lens capable of focusing to macropickup region |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57197507A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61264312A (en) * | 1985-05-20 | 1986-11-22 | Minolta Camera Co Ltd | Telephoto macrolens |
US4764000A (en) * | 1985-05-20 | 1988-08-16 | Minolta Camera Kabushiki Kaisha | Telephoto lens system with three relatively shiftable lens groups |
-
1981
- 1981-05-29 JP JP8338081A patent/JPS57197507A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61264312A (en) * | 1985-05-20 | 1986-11-22 | Minolta Camera Co Ltd | Telephoto macrolens |
US4764000A (en) * | 1985-05-20 | 1988-08-16 | Minolta Camera Kabushiki Kaisha | Telephoto lens system with three relatively shiftable lens groups |
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