JPS57185010A - Rear diaphragm tessar type camera lens - Google Patents

Rear diaphragm tessar type camera lens

Info

Publication number
JPS57185010A
JPS57185010A JP6978781A JP6978781A JPS57185010A JP S57185010 A JPS57185010 A JP S57185010A JP 6978781 A JP6978781 A JP 6978781A JP 6978781 A JP6978781 A JP 6978781A JP S57185010 A JPS57185010 A JP S57185010A
Authority
JP
Japan
Prior art keywords
group
lens
face
aberration
subject
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
JP6978781A
Other languages
Japanese (ja)
Inventor
Yoshinobu Kudo
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 JP6978781A priority Critical patent/JPS57185010A/en
Publication of JPS57185010A publication Critical patent/JPS57185010A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
    • G02B9/14—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only arranged + - +
    • G02B9/18—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only arranged + - + only one component having a compound lens
    • G02B9/20—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only arranged + - + only one component having a compound lens the rear component having the compound

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

PURPOSE:To reduce both the spherical aberration and the comatic aberration, by forming a 3-group and 4-sheet lens system in which the concave side of the joined face of the 3rd group is set toward an object and the thickness is relatively increased at the center of the 2nd group. CONSTITUTION:The 1st group containing a positive menisus lens L1 with its convex side turned to a subject, the 2nd group having a negative lens L2 and the 3rd group containing a combined lens of a positive lens L3 and a negative lens L4 are set in that order from the side of the subject. The concave side of the joined face of the 3rd group is set toward the subject, and at the same time the 3rd group the positive refractive power as a whole. The center thickness d3 of the negative lens of the 2nd group is relatively increased, and the face r3 is set close to the face r1 to reduce both the spherical aberration and the comatic aberration. At the same time, the glass having a comparatively low refractive index is used for the 2nd group lens. Thus equationsI-V are satisfied. As a result, the Petzval's sum is reduced down to about 0.17 although it usually exceeds 0.2. Then the aberration can be well compensated with a 64 deg. wide picture angle and the 1.05-1.1 telephoto ratio.
JP6978781A 1981-05-09 1981-05-09 Rear diaphragm tessar type camera lens Pending JPS57185010A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6978781A JPS57185010A (en) 1981-05-09 1981-05-09 Rear diaphragm tessar type camera lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6978781A JPS57185010A (en) 1981-05-09 1981-05-09 Rear diaphragm tessar type camera lens

Publications (1)

Publication Number Publication Date
JPS57185010A true JPS57185010A (en) 1982-11-15

Family

ID=13412809

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6978781A Pending JPS57185010A (en) 1981-05-09 1981-05-09 Rear diaphragm tessar type camera lens

Country Status (1)

Country Link
JP (1) JPS57185010A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5991408A (en) * 1982-11-18 1984-05-26 Nippon Kogaku Kk <Nikon> Behind-aperture diaphragm lens
JPS62123418A (en) * 1985-11-22 1987-06-04 Nitto Kogaku Kk Compact behind diaphragm lens
FR2729231A1 (en) * 1995-01-06 1996-07-12 Samsung Aerospace Ind OBJECTIVE SYSTEM FOR VIEWING APPARATUS WITH SEPARATE-HEAD TYPE LOAD COUPLING DEVICE

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5991408A (en) * 1982-11-18 1984-05-26 Nippon Kogaku Kk <Nikon> Behind-aperture diaphragm lens
JPH0244042B2 (en) * 1982-11-18 1990-10-02 Nippon Kogaku Kk
JPS62123418A (en) * 1985-11-22 1987-06-04 Nitto Kogaku Kk Compact behind diaphragm lens
FR2729231A1 (en) * 1995-01-06 1996-07-12 Samsung Aerospace Ind OBJECTIVE SYSTEM FOR VIEWING APPARATUS WITH SEPARATE-HEAD TYPE LOAD COUPLING DEVICE

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