Large relative aperture objective lens

Details Large relative aperture objective lens Large relative aperture objective lens

1982-05-06

1985-11-19

Corbin, John K.

350464, G02B 962, G02B 964

Patent

active

045538239

ABSTRACT:
A large relative aperture objective lens having three lens groups of positive power with said three lens groups being all moved forward to effect focusing from an infinitely distant object to close objects. The three lens groups, being named from front to rear, 1st, 2nd and 3rd lens groups successively, have the amounts of forward movement of the 1st, 2nd and 3rd lens groups made progressively smaller. Accordingly, good stability of aberration correction throughout the extended focusing range is achieved.

REFERENCES:
patent: 4392724 (1983-07-01), Hamanishi

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