Telephoto zoom lens system for camera

Details Telephoto zoom lens system for camera Telephoto zoom lens system for camera

1986-01-22

1988-03-08

Arnold, Bruce Y.

G02B 1516, G02B 964

Patent

active

047296437

ABSTRACT:
A telephoto zoom lens system comprises a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power. In a zooming operation, the first lens group moves arithmetically, the second lens group moves from the objective side toward the image side in the first half of the movement and then from the image side toward the objective side in the latter half of movement, and the third lens group moves so as to maintain the image side focal point thereof in a fixed position in conjunction with the first and second lens groups.

REFERENCES:
patent: 4576443 (1986-03-01), Itoh

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