Telephoto zoom lens system

Details Telephoto zoom lens system Telephoto zoom lens system

1986-04-18

1989-06-06

Bovernick, Rodney B.

350423, G02B 1516

Patent

active

048366625

ABSTRACT:
A telephoto zoom lens system comprising a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a stop fixedly arranged in respect to the third lens group, wherein the first lens group comprises a positive lens and a negative lens, the telephoto zoom lens sytem being arranged to be zoomed by moving the first lens group, the third lens group and the stop in the same direction and further arranged that the variation in the position of the entrance pupil to be caused at the time of zooming is small, it is possible to ensure satisfactory intensity of light in the marginal portion, and aberrations are corrected favorably.

REFERENCES:
patent: 4330181 (1982-05-01), Okudaira
patent: 4348082 (1982-09-01), Ogawa
patent: 4449791 (1984-05-01), Terasawa et al.
patent: 4494828 (1985-01-01), Masumoto et al.
patent: 4576443 (1986-03-01), Itoh
patent: 4630899 (1986-12-01), Kato et al.
patent: 4639095 (1987-01-01), Kato
patent: 4650291 (1987-03-01), Kato
patent: 4699475 (1987-10-01), Takahashi et al.

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