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GB237212A - - Google Patents

Info

Publication number
GB237212A
GB237212A GB2493/25A GB249325A GB237212A GB 237212 A GB237212 A GB 237212A GB 2493/25 A GB2493/25 A GB 2493/25A GB 249325 A GB249325 A GB 249325A GB 237212 A GB237212 A GB 237212A
Authority
GB
United Kingdom
Prior art keywords
lens
dispersive
collective
objective
length
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
GB2493/25A
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.)
ERNEMANN-WERKE AG
Original Assignee
ERNEMANN-WERKE AG
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 ERNEMANN-WERKE AG filed Critical ERNEMANN-WERKE AG
Publication of GB237212A publication Critical patent/GB237212A/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

237,212. Ernemann - Werke Akt.- Ges. July 21, 1924, [Convention date]. Lenses.-Photographic objectives corrected chromatically, spherically and astigmatically consist of a dispersive member w embraced by two collective members, the front member of which consists of at least two collective lenses, arranged so that the effective diameter of the pencil of incident rays parallel to the axis at the second surface of the dispersive lens is in relationship to the free opening at the first surface of the objective and to the aperture of the objective (K) such that K D1/D6 = 3. The length of the air space between the dispersive lens and the rear collective lens is at least 20 per cent of the total focal length of the objective. The second of the first two collective members is a meniscus lens. Numerical data are given in the Specification. The Specification, as open to inspection under Sect. 91 (3) (a) states that the constriction of the incident parallel rays at the dispersive member is such that the radius of the surface of the image in the vicinity of the axis is greater than twice and less than 4.5 times the focal length. The nu value of the glass of the dispersive lens is less than 41.0 and the length of the third air space is greater than one third of the aperture of the lens. Specification 186,917 is referred to. This subject-matter does not appear in the Specification as accepted.
GB2493/25A 1924-07-21 1925-01-28 Expired GB237212A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE113393X 1924-07-21

Publications (1)

Publication Number Publication Date
GB237212A true GB237212A (en) 1925-10-01

Family

ID=5653343

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2493/25A Expired GB237212A (en) 1924-07-21 1925-01-28

Country Status (2)

Country Link
CH (1) CH113393A (en)
GB (1) GB237212A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5114322A (en) * 1974-07-27 1976-02-04 Fuji Photo Optical Co Ltd AKARUINANSHOTENRENZU

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1184982B (en) * 1961-05-05 1965-01-07 Voigtlaender Ag Lens made from four free-standing individual lenses
DE1238687B (en) * 1961-09-14 1967-04-13 Schneider Co Optische Werke Fast lens with adjustable focal length
DE1268404B (en) * 1961-11-14 1968-05-16 Zeiss Carl Fa Photographic lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5114322A (en) * 1974-07-27 1976-02-04 Fuji Photo Optical Co Ltd AKARUINANSHOTENRENZU

Also Published As

Publication number Publication date
CH113393A (en) 1926-01-02

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