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JPS5773713A - Rear conversion lens for astronomical telescope - Google Patents

Rear conversion lens for astronomical telescope

Info

Publication number
JPS5773713A
JPS5773713A JP14912780A JP14912780A JPS5773713A JP S5773713 A JPS5773713 A JP S5773713A JP 14912780 A JP14912780 A JP 14912780A JP 14912780 A JP14912780 A JP 14912780A JP S5773713 A JPS5773713 A JP S5773713A
Authority
JP
Japan
Prior art keywords
lens
astronomical telescope
rear conversion
objective lens
conversion lens
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
JP14912780A
Other languages
Japanese (ja)
Other versions
JPS6119009B2 (en
Inventor
Yasunori Arai
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 JP14912780A priority Critical patent/JPS5773713A/en
Publication of JPS5773713A publication Critical patent/JPS5773713A/en
Publication of JPS6119009B2 publication Critical patent/JPS6119009B2/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
    • G02B15/02—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective
    • G02B15/10—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by adding a part, e.g. close-up attachment
    • G02B15/12—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by adding a part, e.g. close-up attachment by adding telescopic attachments

Landscapes

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

Abstract

PURPOSE:To obtain a rear conversion lens of simple constitution for a large-diameter astronomical telescope having small aberrations, by making a lens system, consisting a negative and a positive lens successively from an object lens side, meet prescribed requirements. CONSTITUTION:A lens system, consisting of a negative lens having a concave surface on an image side and a positive lens having a convex surface on an objective lens side successively from the objective lens side, meet requirements as shown by inequalities (1)-(4). In the inequalities, fi, ri, ni, and nui are the focal length, radius of curvature, refractive index to a line (d), and Abbe number of the (i)-th lens from the objective lens side. Consequently, the rear conversion lens, when equipped to the objective lens of an about 1:12 aperture ratio astronomical telescope, provides about 1.4 magnification of the focal length.
JP14912780A 1980-10-24 1980-10-24 Rear conversion lens for astronomical telescope Granted JPS5773713A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14912780A JPS5773713A (en) 1980-10-24 1980-10-24 Rear conversion lens for astronomical telescope

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14912780A JPS5773713A (en) 1980-10-24 1980-10-24 Rear conversion lens for astronomical telescope

Publications (2)

Publication Number Publication Date
JPS5773713A true JPS5773713A (en) 1982-05-08
JPS6119009B2 JPS6119009B2 (en) 1986-05-15

Family

ID=15468311

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14912780A Granted JPS5773713A (en) 1980-10-24 1980-10-24 Rear conversion lens for astronomical telescope

Country Status (1)

Country Link
JP (1) JPS5773713A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61232410A (en) * 1985-04-09 1986-10-16 Nippon Kogaku Kk <Nikon> Rear conversion lens
JPS62160414A (en) * 1986-01-08 1987-07-16 Canon Inc Converter lens
US10690890B2 (en) 2011-06-28 2020-06-23 Largan Precision Co., Ltd. Optical imaging lens assembly
US11480757B2 (en) 2019-10-03 2022-10-25 Largan Precision Co., Ltd. Imaging optical system, imaging apparatus and electronic device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61232410A (en) * 1985-04-09 1986-10-16 Nippon Kogaku Kk <Nikon> Rear conversion lens
JPS62160414A (en) * 1986-01-08 1987-07-16 Canon Inc Converter lens
US10690890B2 (en) 2011-06-28 2020-06-23 Largan Precision Co., Ltd. Optical imaging lens assembly
US11994657B2 (en) 2011-06-28 2024-05-28 Largan Precision Co., Ltd. Optical imaging lens assembly
US11480757B2 (en) 2019-10-03 2022-10-25 Largan Precision Co., Ltd. Imaging optical system, imaging apparatus and electronic device

Also Published As

Publication number Publication date
JPS6119009B2 (en) 1986-05-15

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