Lenses capable of close-up photography

Details Lenses capable of close-up photography Lenses capable of close-up photography

1981-08-20

1984-03-20

Corbin, John K.

G02B 962, G02B 1302

Patent

active

044377347

ABSTRACT:
A lens system comprises a converging first lens group, a diverging second lens group and a converging third lens group arranged in this order as viewed from the object side. The lens can focus continuously from infinity down to a very short object distance by moving only the diverging second lens forward and rearward along the optical axis. The paraxial rays exiting from the second lens group and incident on the third lens group are kept always substantially in parallel with the optical axis throughout all the moving range for focusing of the second lens group.

REFERENCES:
patent: 4113357 (1978-09-01), Nakamura
patent: 4240703 (1980-12-01), Momiyama
patent: 4348084 (1982-09-01), Kitagishi et al.
patent: 4359272 (1982-11-01), Kreitzer

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