JPS5774717A - Telephoto lens - Google Patents

Telephoto lens

Info

Publication number
JPS5774717A
JPS5774717A JP15257780A JP15257780A JPS5774717A JP S5774717 A JPS5774717 A JP S5774717A JP 15257780 A JP15257780 A JP 15257780A JP 15257780 A JP15257780 A JP 15257780A JP S5774717 A JPS5774717 A JP S5774717A
Authority
JP
Japan
Prior art keywords
positive
lens
lens group
negative
optical axis
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.)
Granted
Application number
JP15257780A
Other languages
Japanese (ja)
Other versions
JPS6112246B2 (en
Inventor
Masatake Katou
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 JP15257780A priority Critical patent/JPS5774717A/en
Publication of JPS5774717A publication Critical patent/JPS5774717A/en
Publication of JPS6112246B2 publication Critical patent/JPS6112246B2/ja
Granted 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

Abstract

PURPOSE:To realize compact structure while correcting aberrations excellently, by making a lens system composed of three positive, negative and positive lens systems and by performing focusing by moving the 3rd lens group in the direction of an optical axis. CONSTITUTION:A lens system (having focal length F) consists of the 1st positive lens group F1 of a positive (N1 and nu1), a negative (N2 and nu2) and a positive (N3 and nu3) lens, the 2nd negative lens group F2 having the 1st convex surface on the object side and the final concave surface on the image side, and the 3rd positive lens group F3 of a positive and a negative lens, where each focal length is F, each refractivity N, and each Abbe number is nu. For focusing the 3rd lens group f3 is moved in the direction of an optical axis. Then, conditional inequalities hold.
JP15257780A 1980-10-29 1980-10-29 Telephoto lens Granted JPS5774717A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15257780A JPS5774717A (en) 1980-10-29 1980-10-29 Telephoto lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15257780A JPS5774717A (en) 1980-10-29 1980-10-29 Telephoto lens

Publications (2)

Publication Number Publication Date
JPS5774717A true JPS5774717A (en) 1982-05-11
JPS6112246B2 JPS6112246B2 (en) 1986-04-07

Family

ID=15543507

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15257780A Granted JPS5774717A (en) 1980-10-29 1980-10-29 Telephoto lens

Country Status (1)

Country Link
JP (1) JPS5774717A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0240606A (en) * 1988-07-30 1990-02-09 Asahi Optical Co Ltd Telephotographic lens
JP2015132660A (en) * 2014-01-10 2015-07-23 株式会社オプトロジック imaging lens
JP2015132664A (en) * 2014-01-10 2015-07-23 株式会社オプトロジック imaging lens
JP6372905B1 (en) * 2017-10-19 2018-08-15 エーエーシー テクノロジーズ ピーティーイー リミテッドＡａｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｐｔｅ．Ｌｔｄ． Imaging optical lens
JP6374080B1 (en) * 2017-11-18 2018-08-15 エーエーシー テクノロジーズ ピーティーイー リミテッドＡａｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｐｔｅ．Ｌｔｄ． Imaging optical lens
JP2019095749A (en) * 2017-11-18 2019-06-20 エーエーシー テクノロジーズ ピーティーイー リミテッドＡａｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｐｔｅ．Ｌｔｄ． Image capturing optical lens

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0240606A (en) * 1988-07-30 1990-02-09 Asahi Optical Co Ltd Telephotographic lens
JPH0427522B2 (en) * 1988-07-30 1992-05-12 Asahi Optical Co Ltd
JP2015132660A (en) * 2014-01-10 2015-07-23 株式会社オプトロジック imaging lens
JP2015132664A (en) * 2014-01-10 2015-07-23 株式会社オプトロジック imaging lens
JP6372905B1 (en) * 2017-10-19 2018-08-15 エーエーシー テクノロジーズ ピーティーイー リミテッドＡａｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｐｔｅ．Ｌｔｄ． Imaging optical lens
JP2019079011A (en) * 2017-10-19 2019-05-23 エーエーシー テクノロジーズ ピーティーイー リミテッドＡａｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｐｔｅ．Ｌｔｄ． Imaging optical lens
JP6374080B1 (en) * 2017-11-18 2018-08-15 エーエーシー テクノロジーズ ピーティーイー リミテッドＡａｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｐｔｅ．Ｌｔｄ． Imaging optical lens
JP2019095740A (en) * 2017-11-18 2019-06-20 エーエーシー テクノロジーズ ピーティーイー リミテッドＡａｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｐｔｅ．Ｌｔｄ． Image capturing optical lens
JP2019095749A (en) * 2017-11-18 2019-06-20 エーエーシー テクノロジーズ ピーティーイー リミテッドＡａｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｐｔｅ．Ｌｔｄ． Image capturing optical lens

Also Published As

Publication number Publication date
JPS6112246B2 (en) 1986-04-07

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