Telephoto macro lens system

Details Telephoto macro lens system Telephoto macro lens system

1985-11-25

1987-05-19

Corbin, John K.

G02B 1302, G02B 964

Patent

active

046662600

ABSTRACT:
A telephoto macro lens system includes, in order from the object side, a first lens group having a positive focal length and a second lens group having a negative focal length. The first lens group is composed of a first subgroup (1a) including a positive lens group and a negative meniscus lens and a second subgroup (1b) including a negative lens having a divergent surface on the object side. The second lens group is composed of a third subgroup (2a) having a large negative refractive power and a positive unitary lens (2b) spaced from the third subgroup. The lens system is so constructed as to satisfy the following conditions:

REFERENCES:
patent: 4518229 (1985-05-01), Yasukuni
patent: 4558928 (1985-12-01), Imaizumi

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