Close focusing zoom lens

Details Close focusing zoom lens Close focusing zoom lens

1980-08-15

1981-12-29

Corbin, John K.

G02B 1518

Patent

active

043079431

ABSTRACT:
A zoom lens having capability of focusing to a magnification of 1:2 through movement of only the front focusing group. The power of the focusing group is chosen in relation to the power of the lens at its long focal length to accomplish close focusing with minimal axial travel while providing good aberration correction.

REFERENCES:
patent: 3524696 (1970-08-01), Higuchi
patent: 3615125 (1971-10-01), Guchi et al.
patent: 3784284 (1974-01-01), Nakamura
patent: 3884555 (1975-05-01), Suwa et al.
patent: 4094586 (1978-06-01), Sato et al.
patent: 4240699 (1980-12-01), Sato et al.

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