Close-up lens system

Details Close-up lens system Close-up lens system

1985-03-07

1987-03-31

Corbin, John K.

350428, 350464, G02B 962, G02B 964

Patent

active

046538763

ABSTRACT:
Herein disclosed is a close-up photographic lens system comprising a first lens group disposed on the object side and having a positive refractive power and a second lens group disposed on the image side and having a negative refractive power. The first lens group is movable relative to the second lens group, thereby focusing the object from an infinite distance to a close-up distance with respect to the lens system. The lens system meets the following conditions.

REFERENCES:
patent: 3784285 (1974-01-01), Watanabe et al.
patent: 4307943 (1981-12-01), Betensky et al.

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