Telephoto lens system with three relatively shiftable lens group

Details Telephoto lens system with three relatively shiftable lens group Telephoto lens system with three relatively shiftable lens group

1986-05-19

1988-08-16

Corbin, John J,

350463, 350475, G02B 1302, G02B 900, G02B 914

Patent

active

047640006

ABSTRACT:
A telephoto lens system is provided having a first lens group of a positive refractive power, a second lens group of a negative refractive power with a variable air space, and a third lens group of a positive refractive power with a variable air space. All of the lens groups are shiftable during a focusing operation with the second lens group air space increasing and the third lens group air space decreasing when focusing is effected from infinity to a short distance.

REFERENCES:
patent: 4392724 (1983-07-01), Hamanishi
patent: 4435049 (1984-03-01), Horikawa et al.
patent: 4483597 (1984-11-01), Mihara
patent: 4666260 (1987-05-01), Itoh

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