GB592144A - Improvements in and relating to objectives suitable for photographic purposes - Google Patents

Improvements in and relating to objectives suitable for photographic purposes

Info

Publication number
GB592144A
GB592144A GB1277445A GB1277445A GB592144A GB 592144 A GB592144 A GB 592144A GB 1277445 A GB1277445 A GB 1277445A GB 1277445 A GB1277445 A GB 1277445A GB 592144 A GB592144 A GB 592144A
Authority
GB
United Kingdom
Prior art keywords
lenses
refractive
dispersive
indices
lie
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
GB1277445A
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.)
GEORGE ARTHUR RICHMOND
Original Assignee
GEORGE ARTHUR RICHMOND
Filing date
Publication date
Application filed by GEORGE ARTHUR RICHMOND filed Critical GEORGE ARTHUR RICHMOND
Publication of GB592144A publication Critical patent/GB592144A/en
Expired 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 -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only

Landscapes

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

Abstract

592,144. Lenses. HASSELKUS, J. W., and RICHMOND, G. A. May 22, 1945, No. 12774. [Class 97 (i)] An objective of the type shown comprising a negative doublet and a positive meniscus on each side of a central diaphragm has the following characteristics : (1) the refractive indices of the double convex lenses lie between 1.66 and 1.57 and their dispersive indices are above 53. (2) The refractive and dispersive indices of the double concave lenses are lower than those of the double convex lenses so that at the cemented surfaces the difference of refractive index is not greater than 0.8 and of dispersive index not greater than 20. (3) The refractive and dispersive indices of the positive menisci lie between 1.66 and 1.51 and 45 and 60 respectively. (4) The focal lengths of the doublets are each numerically greater than twice the focal length of the complete lens and the focal lengths of the meniscus lenses lie between .08 and 1.6 such focal length. Data are given.
GB1277445A 1945-05-22 Improvements in and relating to objectives suitable for photographic purposes Expired GB592144A (en)

Publications (1)

Publication Number Publication Date
GB592144A true GB592144A (en) 1947-09-09

Family

ID=1721552

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1277445A Expired GB592144A (en) 1945-05-22 Improvements in and relating to objectives suitable for photographic purposes

Country Status (1)

Country Link
GB (1) GB592144A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2600207A (en) * 1949-04-04 1952-06-10 Taylor Taylor & Hobson Ltd Four component optical objectives having four internal contact surfaces
US2601595A (en) * 1951-02-15 1952-06-24 Taylor Taylor & Hobson Ltd Four component optical objective
US2601593A (en) * 1951-02-15 1952-06-24 Taylor Taylor & Hobson Ltd Four component optical objective
US3018689A (en) * 1959-05-28 1962-01-30 Bausch & Lomb Optical system for electro-optical switching apparatus
US3482902A (en) * 1965-10-14 1969-12-09 Rodenstock Optik G Modified symmetrical wide-angle objective

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2600207A (en) * 1949-04-04 1952-06-10 Taylor Taylor & Hobson Ltd Four component optical objectives having four internal contact surfaces
US2601595A (en) * 1951-02-15 1952-06-24 Taylor Taylor & Hobson Ltd Four component optical objective
US2601593A (en) * 1951-02-15 1952-06-24 Taylor Taylor & Hobson Ltd Four component optical objective
US3018689A (en) * 1959-05-28 1962-01-30 Bausch & Lomb Optical system for electro-optical switching apparatus
US3482902A (en) * 1965-10-14 1969-12-09 Rodenstock Optik G Modified symmetrical wide-angle objective

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