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
GB6624/60A
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.)
ISK Optics GmbH
Original Assignee
Isco Optische Werke GmbH
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 Isco Optische Werke GmbHfiledCriticalIsco Optische Werke GmbH
Publication of GB884693ApublicationCriticalpatent/GB884693A/en
G02B15/00—Optical objectives with means for varying the magnification
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Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
Optics & Photonics
(AREA)
Projection-Type Copiers In General
(AREA)
Abstract
884,693. Lens attachments. ISCOOPTISCHE WERKE G.m.b.H. Feb. 25, 1960 [March 7, 1959], No. 6624/60. Drawings to Specification. Class 97(1). A supplementary lens attachment for use with a photographic objective comprises at least two components of opposite refractive powers separated by an air gap. Three numerical examples are given.