JPS57161718A - Zoom lens - Google Patents

Zoom lens

Info

Publication number
JPS57161718A
JPS57161718A JP56045889A JP4588981A JPS57161718A JP S57161718 A JPS57161718 A JP S57161718A JP 56045889 A JP56045889 A JP 56045889A JP 4588981 A JP4588981 A JP 4588981A JP S57161718 A JPS57161718 A JP S57161718A
Authority
JP
Japan
Prior art keywords
lens
positive
negative
zoom lens
meniscus
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
JP56045889A
Other languages
Japanese (ja)
Other versions
JPS6151292B2 (en
Inventor
Sadao Okudaira
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.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo 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 Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Priority to JP56045889A priority Critical patent/JPS57161718A/en
Publication of JPS57161718A publication Critical patent/JPS57161718A/en
Publication of JPS6151292B2 publication Critical patent/JPS6151292B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
    • G02B15/1421—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only the first group being positive

Landscapes

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

Abstract

PURPOSE:To obtain a high-performance, compact zoom lens for a 35mm. single- lens reflex camera which covers a 35-80mm. focal-length range, by composing the zoom lens system of two front and rear groups which have negative refracting power and positive refracting power from an object side. CONSTITUTION:A front group consists of three-four lenses including >=1 positive lens and >=1 negative lens and a positive meniscus lens at the closest position to an image, and a rear group consists of six lenses-a positive, a positive meniscus, a negative, a negative meniscus, and a positive lens-from an object side. Further, inequalities (1)-(3) hold.
JP56045889A 1981-03-28 1981-03-28 Zoom lens Granted JPS57161718A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56045889A JPS57161718A (en) 1981-03-28 1981-03-28 Zoom lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56045889A JPS57161718A (en) 1981-03-28 1981-03-28 Zoom lens

Publications (2)

Publication Number Publication Date
JPS57161718A true JPS57161718A (en) 1982-10-05
JPS6151292B2 JPS6151292B2 (en) 1986-11-08

Family

ID=12731804

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56045889A Granted JPS57161718A (en) 1981-03-28 1981-03-28 Zoom lens

Country Status (1)

Country Link
JP (1) JPS57161718A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4603948A (en) * 1983-01-18 1986-08-05 Olympus Optical Co., Ltd. Large-aperture wide-angle zoom lens system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52153752A (en) * 1976-06-17 1977-12-21 Olympus Optical Co Ltd Wide angle zoom lens
JPS5562421A (en) * 1978-09-11 1980-05-10 Optigon Res & Dev Corp Zoom lens

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52153752A (en) * 1976-06-17 1977-12-21 Olympus Optical Co Ltd Wide angle zoom lens
JPS5562421A (en) * 1978-09-11 1980-05-10 Optigon Res & Dev Corp Zoom lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4603948A (en) * 1983-01-18 1986-08-05 Olympus Optical Co., Ltd. Large-aperture wide-angle zoom lens system

Also Published As

Publication number Publication date
JPS6151292B2 (en) 1986-11-08

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