Telephoto objective

Details Telephoto objective Telephoto objective

1983-05-02

1985-04-02

Corbin, John K.

G02B 1302, G02B 962, G02B 964

Patent

active

045084335

ABSTRACT:
In a telephoto objective, a positive lens group and a negative lens group closer to the image than the positive lens group move simultaneously in axially opposite directions and relative to a stationary positive lens group which is closer to the image than both movable lens groups while the telephoto objective is being focused on an object. According to one embodiment of the invention, the diaphragm between the movable lens groups is varied in response to focusing so as to control the variation of the diameter of an on-axial light ray bundle.

REFERENCES:
patent: 4045128 (1977-08-01), Momiyama
patent: 4053211 (1977-10-01), Momiyama
patent: 4113357 (1978-09-01), Nakamura
patent: 4176913 (1979-12-01), Nakamura et al.

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