JPS56159613A - Telephone lens - Google Patents

Telephone lens

Info

Publication number
JPS56159613A
JPS56159613A JP6444480A JP6444480A JPS56159613A JP S56159613 A JPS56159613 A JP S56159613A JP 6444480 A JP6444480 A JP 6444480A JP 6444480 A JP6444480 A JP 6444480A JP S56159613 A JPS56159613 A JP S56159613A
Authority
JP
Japan
Prior art keywords
negative
positive
lens
lenses
lens groups
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
JP6444480A
Other languages
Japanese (ja)
Inventor
Kazuo Fujibayashi
Nozomi Kitagishi
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP6444480A priority Critical patent/JPS56159613A/en
Priority to DE19813119273 priority patent/DE3119273A1/en
Publication of JPS56159613A publication Critical patent/JPS56159613A/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 obtain a rear-focus telephoto lens which has the short overall optical length, excellently corrected chromatic aberration and a large aperture ratio, by making a lens system, consisting of four positive, negative, negative, and positive lens groups from the object side, meet prescribed requirements. CONSTITUTION:In a lens system consisting of four positive, negative, negative, and positive lens groups from the object side succesively, the 2nd lens groups is moved for focusing and inequalities (1)-(3), or (1) and (4)-(7) hole. In those inequalities, fI, fII and fIII are focal lengths of optical systems composed of lenses I, II and III in infinite-distance focusing, fT the focal length of the entire system, n5 and n6, nu5 and nu6, and theta5 and theta6 refractive index, Abbe numbers, and dispersion ratios of positive and negative lenses in the 3rd lens group, r10 the radius of curvature of its combined surface, and nu7 and nu8, and theta7 and theta8 the Abbe numbers and dispersion ratios of negative and positive lenses in the 4th group. Thus, a large- aperture-ratio telephone lens having the short overall optical length and excellently corrected chromatic aberration is obtained.
JP6444480A 1980-05-15 1980-05-15 Telephone lens Pending JPS56159613A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP6444480A JPS56159613A (en) 1980-05-15 1980-05-15 Telephone lens
DE19813119273 DE3119273A1 (en) 1980-05-15 1981-05-14 Telephoto lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6444480A JPS56159613A (en) 1980-05-15 1980-05-15 Telephone lens

Publications (1)

Publication Number Publication Date
JPS56159613A true JPS56159613A (en) 1981-12-09

Family

ID=13258440

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6444480A Pending JPS56159613A (en) 1980-05-15 1980-05-15 Telephone lens

Country Status (2)

Country Link
JP (1) JPS56159613A (en)
DE (1) DE3119273A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5917519A (en) * 1982-07-21 1984-01-28 Canon Inc Telephoto lens with large diameter
JPS6028612A (en) * 1983-07-27 1985-02-13 Nippon Kogaku Kk <Nikon> High-aperture ratio telephoto lens
US4610514A (en) * 1982-10-07 1986-09-09 Minolta Camera Kabushiki Kaisha Telephoto lens system
JP2013003354A (en) * 2011-06-16 2013-01-07 Nikon Corp Telephoto lens, optical device and manufacturing method of telephoto lens

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4726669A (en) * 1985-12-03 1988-02-23 Pierre Angenieux High relative aperture objective lens system with compound focusing

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4045128A (en) * 1974-04-25 1977-08-30 Canon Kabushiki Kaisha Telephoto objective
JPS53134425A (en) * 1977-04-28 1978-11-24 Nippon Chemical Ind Large aperture ratio telescopic lens
JPS6032849B2 (en) * 1977-06-28 1985-07-30 キヤノン株式会社 telescope lens
JPH068929B2 (en) * 1983-02-04 1994-02-02 オリンパス光学工業株式会社 Focusing method of telephoto lens

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5917519A (en) * 1982-07-21 1984-01-28 Canon Inc Telephoto lens with large diameter
US4610514A (en) * 1982-10-07 1986-09-09 Minolta Camera Kabushiki Kaisha Telephoto lens system
JPS6028612A (en) * 1983-07-27 1985-02-13 Nippon Kogaku Kk <Nikon> High-aperture ratio telephoto lens
JPH0412443B2 (en) * 1983-07-27 1992-03-04 Nippon Kogaku Kk
JP2013003354A (en) * 2011-06-16 2013-01-07 Nikon Corp Telephoto lens, optical device and manufacturing method of telephoto lens

Also Published As

Publication number Publication date
DE3119273A1 (en) 1982-07-08

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