ZOOM LENS HAVING AN EXTREMELY LONG FOCAL LENGTH RANGE AND WIDE RELATIVE APERTURE

摘要

1437620 Zoom lenses JOS SCHNEIDER & CO OPTISCHE WERKE 29 Aug 1973 [14 Sept 1972] 40629/73 Heading G2J A zoom lens of long focal length range (e.g. 1:30) and wide relative aperture (e.g. 1:1.7 to 1:5.1) for projection, cinematography or television comprises at least two separate variable sections (term defined) which in toto comprise at least three fixed lens components and at least four displaceable lens components for continuous and stepless variation of the focal length. Data are given for three examples.