GB817455A - Improvements in or relating to reversible lens attachments - Google Patents

Improvements in or relating to reversible lens attachments

Info

Publication number
GB817455A
GB817455A GB30063/57A GB3006357A GB817455A GB 817455 A GB817455 A GB 817455A GB 30063/57 A GB30063/57 A GB 30063/57A GB 3006357 A GB3006357 A GB 3006357A GB 817455 A GB817455 A GB 817455A
Authority
GB
United Kingdom
Prior art keywords
lens
tube
doublet
mount
focal 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
GB30063/57A
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 GB817455A publication Critical patent/GB817455A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00Optical objectives with means for varying the magnification
    • G02B15/02Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective

Landscapes

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

Abstract

817,455. Lens attachments. KODAK Ltd. Sept. 25, 1957 [Oct. 1, 1956], No. 30063/57. Classes 97(1) and 98(1) A substantially afocal reversible lens attachment comprises a biconvex doublet 1, 2 of focal length f and a biconcave component (e.g. a simple lens 3) of focal length between-0.7f and-0.9f, the radii of the surfaces R 1 to R 5 being such that 0.7f < + R 1 < 0.9f, 0.6f < -R 2 < f, 1.1f < -R 3 < 1.7f, 0.8f < -R 4 < 1.2f, and 0.85f < + R 5 < 1.3f, the refractive indices N 1 and N 2 of the positive doublet being such that 1.48 < N 1 < 1.57 and 1.58 < N 2 < 1.67, the refractive index N 3 of the negative component or of each element therein being such that 1.58 < N 3 < 1.67, the two components being of substantially equal diameter and being mounted in a lens tube each end of which is relatively detachable to the mount of a standard objective. As shown, the lens tube 51 has a central thread so that either end of the tube can be screwed into a collet 52 having an expandable end 53 for gripping firmly the mount 50 of a standard objective (e.g. in a camera). The negative component may be an achromatic doublet made up of elements having the same refractive index but different AbbÚ numbers.
GB30063/57A 1956-10-01 1957-09-25 Improvements in or relating to reversible lens attachments Expired GB817455A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US817455XA 1956-10-01 1956-10-01

Publications (1)

Publication Number Publication Date
GB817455A true GB817455A (en) 1959-07-29

Family

ID=22166122

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30063/57A Expired GB817455A (en) 1956-10-01 1957-09-25 Improvements in or relating to reversible lens attachments

Country Status (1)

Country Link
GB (1) GB817455A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3116359A (en) * 1959-03-07 1963-12-31 Isco Optische Werke Gmbh Front attachment for optical objectives
WO2009114255A1 (en) * 2008-03-11 2009-09-17 Bausch & Lomb Incorporated Device and method for demonstrating optical effects
FR2941538A1 (en) * 2009-01-26 2010-07-30 Voxel Electronics Ind Optical device for forming three-dimensional volume directly visible by spectator in e.g. media application, has intervention units intervening on perception of volume image, and reinforcement units reinforcing perception of volume image

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3116359A (en) * 1959-03-07 1963-12-31 Isco Optische Werke Gmbh Front attachment for optical objectives
WO2009114255A1 (en) * 2008-03-11 2009-09-17 Bausch & Lomb Incorporated Device and method for demonstrating optical effects
US7957059B2 (en) 2008-03-11 2011-06-07 Bausch & Lomb Incorporated Device and method for demonstrating optical effects
FR2941538A1 (en) * 2009-01-26 2010-07-30 Voxel Electronics Ind Optical device for forming three-dimensional volume directly visible by spectator in e.g. media application, has intervention units intervening on perception of volume image, and reinforcement units reinforcing perception of volume image

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