GB234743A - Photographic lens - Google Patents

Photographic lens

Info

Publication number
GB234743A
GB234743A GB1719/25A GB171925A GB234743A GB 234743 A GB234743 A GB 234743A GB 1719/25 A GB1719/25 A GB 1719/25A GB 171925 A GB171925 A GB 171925A GB 234743 A GB234743 A GB 234743A
Authority
GB
United Kingdom
Prior art keywords
lens
negative lens
increase
power
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
GB1719/25A
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 GB234743A publication Critical patent/GB234743A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10B—ORGANS, HARMONIUMS OR SIMILAR WIND MUSICAL INSTRUMENTS WITH ASSOCIATED BLOWING APPARATUS
    • G10B1/00—General design of organs, harmoniums or similar wind musical instruments with associated blowing apparatus
    • G10B1/08—General design of organs, harmoniums or similar wind musical instruments with associated blowing apparatus of harmoniums, i.e. reed organs
    • 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)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)

Abstract

234,743. Ernemann-Werke Akt.-Ges. Oct. 24, 1924, [Convention date]. Lenses. - The constructional length of the lens described in Specification 193,376 is shortened by reducing the length of the third air space. The errors of chromatic correction introduced by this shortening are corrected by increasing the power of the cemented negative lens, whereby the parallel rays incident on the first surface of the first lens are divergent upon emerging from the dispersive lens. The increase in the zonal spherical aberration consequent upon the increase in the power of the negative lens is eliminated by arranging the refractive index of the positive lens to be greater than that of the negative lens. Numerical data are given in the Specification.
GB1719/25A 1924-10-24 1925-01-20 Photographic lens Expired GB234743A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE234743X 1924-10-24

Publications (1)

Publication Number Publication Date
GB234743A true GB234743A (en) 1925-06-04

Family

ID=5893197

Family Applications (3)

Application Number Title Priority Date Filing Date
GB1719/25A Expired GB234743A (en) 1924-10-24 1925-01-20 Photographic lens
GB1718/25A Expired GB232531A (en) 1924-10-24 1925-01-20
GB3078/25A Expired GB232533A (en) 1924-10-24 1925-02-03

Family Applications After (2)

Application Number Title Priority Date Filing Date
GB1718/25A Expired GB232531A (en) 1924-10-24 1925-01-20
GB3078/25A Expired GB232533A (en) 1924-10-24 1925-02-03

Country Status (1)

Country Link
GB (3) GB234743A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4310221A (en) * 1978-10-13 1982-01-12 Canon Kabushiki Kaisha Variable soft-focus lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4310221A (en) * 1978-10-13 1982-01-12 Canon Kabushiki Kaisha Variable soft-focus lens

Also Published As

Publication number Publication date
GB232531A (en) 1925-04-23
GB232533A (en) 1925-04-23

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