JPS57104107A - Telephoto lens - Google Patents

Telephoto lens

Info

Publication number
JPS57104107A
JPS57104107A JP18102680A JP18102680A JPS57104107A JP S57104107 A JPS57104107 A JP S57104107A JP 18102680 A JP18102680 A JP 18102680A JP 18102680 A JP18102680 A JP 18102680A JP S57104107 A JPS57104107 A JP S57104107A
Authority
JP
Japan
Prior art keywords
lens
lens group
positive
negative
lenses
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
JP18102680A
Other languages
Japanese (ja)
Other versions
JPS6112247B2 (en
Inventor
Masakazu Yamagata
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 JP18102680A priority Critical patent/JPS57104107A/en
Publication of JPS57104107A publication Critical patent/JPS57104107A/en
Publication of JPS6112247B2 publication Critical patent/JPS6112247B2/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

Landscapes

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

Abstract

PURPOSE:To obtain a telephoto lens having accurate focusing and about 0.7 telephoto ratio by satisfying lenses which can be focused by moving the back lens group with a prescribed condition in a system consisting of the front and back lens groups. CONSTITUTION:A lens system is constituted by the front lens group F composed of positive, positive and negative single lenses arranged from an object side in sequence and having positive refractive index and the back lens group R composed of a negative lens whose image side is concave and a positive lens whose image side is convex and having negative refractive index, and can be focused by changing the space between the whole lens system and focusing surface and moving the back lens group in the optic axis direction. When (f) is the focal length of the whole system at focusing the light from an infinite object on the system, fF is the focal distance of the front lens group F, r1 and r3 are the radiuses of curvature of the 1st and 3rd lenses in the object side, fR is the focal length of the back rens group R, fN is the focal length of the negative lens part of the back lens group R, rN and rP are the radiuses of curvature of the image side's surface of the negative and positive lenses of the back lens group R, each condition of formulas (1)-(2) is satisfied.
JP18102680A 1980-12-20 1980-12-20 Telephoto lens Granted JPS57104107A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18102680A JPS57104107A (en) 1980-12-20 1980-12-20 Telephoto lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18102680A JPS57104107A (en) 1980-12-20 1980-12-20 Telephoto lens

Publications (2)

Publication Number Publication Date
JPS57104107A true JPS57104107A (en) 1982-06-29
JPS6112247B2 JPS6112247B2 (en) 1986-04-07

Family

ID=16093460

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18102680A Granted JPS57104107A (en) 1980-12-20 1980-12-20 Telephoto lens

Country Status (1)

Country Link
JP (1) JPS57104107A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022100271A1 (en) * 2020-11-16 2022-05-19 北京领邦智能装备股份公司 Lens assembly, imaging device, detection device, and detection system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022100271A1 (en) * 2020-11-16 2022-05-19 北京领邦智能装备股份公司 Lens assembly, imaging device, detection device, and detection system

Also Published As

Publication number Publication date
JPS6112247B2 (en) 1986-04-07

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