Zoom lens of short total length

Details Zoom lens of short total length Zoom lens of short total length

1985-06-05

1988-02-23

Arnold, Bruce Y.

350477, G02B 1500

Patent

active

047266686

ABSTRACT:
In the disclosed zoom lens, a positive front lens unit and a negative rear lens unit are moved forwardly axially in differential relation to vary the overall focal length from a minimum to a maximum value, while a positive middle lens unit is kept stationary during the variation of the focal length. A diaphragm determining the F-number is positioned at a fixed point between the front and rear lens units.

REFERENCES:
patent: 4494828 (1985-01-01), Masumoto et al.
patent: 4506958 (1985-03-01), Imai

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