Dual focal length objective

Details Dual focal length objective Dual focal length objective

1978-07-17

1980-11-25

Henry, Jon W.

350 42, 350 55, G02B 1700

Patent

active

042355087

ABSTRACT:
The invention provides a highly corrected, parfocalized, two-focal-length optical system comprising a primary image producing group consisting of a catadioptric lens system which forms its image within a first, positive field lens, and a second group comprising a symmetrical relay system coaxial with the primary group and movable axially relative to the primary image producing group, the relay system reimaging the image formed by the primary group through a second, negative field lens onto the fixed plane of the final image, movement of the relay lens between its extreme positions permitting close focusing of the entire system without altering its overall length.

REFERENCES:
patent: 1167164 (1916-01-01), Grebe
patent: 2685820 (1954-08-01), Kaprelian
patent: 3049054 (1962-08-01), Waland
patent: 3363962 (1968-01-01), Vogl
patent: 3454326 (1969-07-01), Schlegel
patent: 3529888 (1970-09-01), Buchroeder
patent: 3944338 (1976-03-01), Fleischman
patent: 4061420 (1977-12-01), Kaprelian et al.

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