Vari-focal photographic lens system of lens group exchange type

Details Vari-focal photographic lens system of lens group exchange type Vari-focal photographic lens system of lens group exchange type

1985-04-16

1987-05-26

Corbin, John K.

G02B 962, G02B 1502

Patent

active

046680543

ABSTRACT:
A vari-focal photographic lens system of lens group exchange type comprising, in the order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a third lens unit having negative refractive power, the vari-focal photographic lens system being arranged to vary the focal length thereof by exchanging the second lens unit for another second lens unit having different lens configuration.

REFERENCES:
patent: 4466707 (1984-08-01), Ikemori et al.

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