Finding device of variable magnification

Details Finding device of variable magnification Finding device of variable magnification

1986-07-03

1988-10-25

Henry, Jon W.

350426, 350570, G02B 2300, G02B 1515

Patent

active

047799692

ABSTRACT:
A variable magnification finder including from front to rear, a first lens unit of negative power, a second lens unit of positive power and a third lens unit of positive power, these three units constituting an objective lens of positive overall power, followed by an eyepiece lens of positive power, wherein a finder image formed by the first and second units near the third lens unit is observed by the eyepiece lens, and, with the other lens units being held stationary, the second lens unit is axially moved to vary the finder magnification.

REFERENCES:
patent: 696788 (1902-04-01), Allen
patent: 3227042 (1966-01-01), Smejkal et al.
patent: 3994572 (1976-11-01), Uesugi et al.
patent: 4009928 (1977-03-01), Back
patent: 4018510 (1977-04-01), Bertele
Leonard Bergstein et al., "Two-Component Optically Compensated Varifocal Systems", J. Opt. Soc. Am., vol. 52, No. 4, pp. 353-362, Apr. 1962.

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