Zoom lens

Details Zoom lens Zoom lens

1981-06-17

1984-02-21

Arnold, Bruce Y.

350449, 350450, G02B 711

Patent

active

044326157

ABSTRACT:
A zoom lens includes a number of lens groups in which the first lens group, counting from the front, is movably adjustable for focusing. A stop is arranged at the rear of the zooming lens groups for movement forwardly together with the first lens group upon focusing down to shorter object distances. Accordingly, added compactness of the entire lens system is achieved, while high grade imagery is preserved throughout the extended focusing range.

REFERENCES:
patent: 2663223 (1953-12-01), Hopkins
patent: 3094581 (1963-06-01), Back
patent: 3353891 (1967-11-01), Rosenberger
patent: 4159865 (1979-07-01), Kawamura et al.

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