JPH01134411A - Reverse telephoto type photographic lens - Google Patents

Reverse telephoto type photographic lens

Info

Publication number
JPH01134411A
JPH01134411A JP29313487A JP29313487A JPH01134411A JP H01134411 A JPH01134411 A JP H01134411A JP 29313487 A JP29313487 A JP 29313487A JP 29313487 A JP29313487 A JP 29313487A JP H01134411 A JPH01134411 A JP H01134411A
Authority
JP
Japan
Prior art keywords
refracting power
focusing
cemented lens
group
group iii
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
JP29313487A
Inventor
Hideki Ogawa
Tsunefumi Tanaka
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 JP29313487A priority Critical patent/JPH01134411A/en
Publication of JPH01134411A publication Critical patent/JPH01134411A/en
Application status is Pending legal-status Critical

Links

Abstract

PURPOSE: To reduce aberrational variation over the entire range of body distance by employing the advantages of an inner focus system which performs focusing by moving a 2nd group among 1stW3rd groups.
CONSTITUTION: The 1st group I with negative refracting power, the 2nd group II with positive refracting power, and the 3rd group III with positive refracting power are provided and the 2nd group II is moved on the optical axis to perform the focusing. Then an inequality I holds, where fi is the focal length of an (i)th group, (f) the focal length of the whole system, ϕ3B the refracting power of the cemented lens surface of the cemented lens of the 3rd group III, and R3A and R3C the radii of curvature of the lens surfaces of the cemented lens of the 3rd group III on the object side and image plane side. Consequently, the aberrational variation at the time of the focusing, specially, coma aberration and astigmatism are compensated excellently over the entire range of object distance.
COPYRIGHT: (C)1989,JPO&Japio
JP29313487A 1987-11-20 1987-11-20 Reverse telephoto type photographic lens Pending JPH01134411A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29313487A JPH01134411A (en) 1987-11-20 1987-11-20 Reverse telephoto type photographic lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29313487A JPH01134411A (en) 1987-11-20 1987-11-20 Reverse telephoto type photographic lens

Publications (1)

Publication Number Publication Date
JPH01134411A true JPH01134411A (en) 1989-05-26

Family

ID=17790857

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29313487A Pending JPH01134411A (en) 1987-11-20 1987-11-20 Reverse telephoto type photographic lens

Country Status (1)

Country Link
JP (1) JPH01134411A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5315441A (en) * 1992-01-16 1994-05-24 Nikon Corporation Inverse telephoto large aperture wide angle lens
US5631780A (en) * 1993-07-23 1997-05-20 Nikon Corporation Wide-angle lens
US6710942B2 (en) 2001-10-17 2004-03-23 Nikon Corporation Super wide-angle lens system and shooting device using the same
JP2013235239A (en) * 2012-04-12 2013-11-21 Konica Minolta Inc Macro lens and image capturing device
JP2015191237A (en) * 2014-03-28 2015-11-02 ライカ カメラ アクチエンゲゼルシャフト Compact modified retrofocus-type wide-angle lens
US9810885B2 (en) 2014-03-05 2017-11-07 Ricoh Company, Ltd. Imaging-optical system, stereo camera apparatus, and in-vehicle camera apparatus
US10281690B2 (en) 2014-03-05 2019-05-07 Ricoh Company, Ltd. Imaging optical system, stereo camera device and car-mounted camera device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5315441A (en) * 1992-01-16 1994-05-24 Nikon Corporation Inverse telephoto large aperture wide angle lens
US5631780A (en) * 1993-07-23 1997-05-20 Nikon Corporation Wide-angle lens
US6710942B2 (en) 2001-10-17 2004-03-23 Nikon Corporation Super wide-angle lens system and shooting device using the same
JP2013235239A (en) * 2012-04-12 2013-11-21 Konica Minolta Inc Macro lens and image capturing device
US9810885B2 (en) 2014-03-05 2017-11-07 Ricoh Company, Ltd. Imaging-optical system, stereo camera apparatus, and in-vehicle camera apparatus
US10281690B2 (en) 2014-03-05 2019-05-07 Ricoh Company, Ltd. Imaging optical system, stereo camera device and car-mounted camera device
JP2015191237A (en) * 2014-03-28 2015-11-02 ライカ カメラ アクチエンゲゼルシャフト Compact modified retrofocus-type wide-angle lens

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