GB602813A - Improvements in or relating to photographic objectives - Google Patents

Improvements in or relating to photographic objectives

Info

Publication number
GB602813A
GB602813A GB20464/45A GB2046445A GB602813A GB 602813 A GB602813 A GB 602813A GB 20464/45 A GB20464/45 A GB 20464/45A GB 2046445 A GB2046445 A GB 2046445A GB 602813 A GB602813 A GB 602813A
Authority
GB
United Kingdom
Prior art keywords
less
dispersive
index
whose
refractive index
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.)
Expired
Application number
GB20464/45A
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.)
Kodak Ltd
Original Assignee
Kodak 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 Kodak Ltd filed Critical Kodak Ltd
Publication of GB602813A publication Critical patent/GB602813A/en
Expired 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

Landscapes

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

Abstract

602,813. Photographic objectives. KODAK, Ltd. Aug. 9, 1945, No. 20464. Convention date, Aug. 10, 1944. [Class 97 (i)] In an objective comprising four coaxial components separated by air, of which the two outer ones are positive and the inner ones compound negative menisci highly concave towards each other, the second component consists of a biconvex element of refractive index less than 1.56 and dispersive index greater than 55 cemented to the front of a biconcave element whose refractive index is at least .08 greater and whose dispersive index is at least 20 less than that of the biconvex element. The third element may consist of a positive element of refractive and dispersive indices respectively greater than 1.68 and 45 cemented to the back of a biconcave element, whose refractive index is less by .15 and whose dispersive index is less than that of the biconvex element. Data are given for one example of the lens shown. Specifications 559,390 and 602,863 are referred to.
GB20464/45A 1944-08-10 1945-08-09 Improvements in or relating to photographic objectives Expired GB602813A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US602813XA 1944-08-10 1944-08-10

Publications (1)

Publication Number Publication Date
GB602813A true GB602813A (en) 1948-06-03

Family

ID=22028514

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20464/45A Expired GB602813A (en) 1944-08-10 1945-08-09 Improvements in or relating to photographic objectives

Country Status (1)

Country Link
GB (1) GB602813A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE964726C (en) * 1950-09-14 1957-07-11 Voigtlaender A G Four-unit Gauss lens
DE1102434B (en) * 1955-01-03 1961-03-16 Canon Camera Company Inc Photographic lens Gaussian design

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE964726C (en) * 1950-09-14 1957-07-11 Voigtlaender A G Four-unit Gauss lens
DE1102434B (en) * 1955-01-03 1961-03-16 Canon Camera Company Inc Photographic lens Gaussian design

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