JPS57197507A - Telephoto lens capable of focusing to macropickup region - Google Patents

Telephoto lens capable of focusing to macropickup region

Info

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
Application number
JP8338081A
Other languages
Japanese (ja)
Inventor
Mitsuo Yasukuni
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Minolta Co Ltd
Original Assignee
Minolta Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP8338081A priority Critical patent/JPS57197507A/en
Publication of JPS57197507A publication Critical patent/JPS57197507A/en
Pending legal-status Critical Current

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.
JP8338081A 1981-05-29 1981-05-29 Telephoto lens capable of focusing to macropickup region Pending JPS57197507A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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