Telephoto zoom lens

Details Telephoto zoom lens Telephoto zoom lens

1980-10-03

1982-08-24

Corbin, John K.

G02B 1516

Patent

active

043458220

ABSTRACT:
A compact zoom lens for a 35 mm SLR camera having a focal length at the telephoto end extending into a super telephoto region and having a zoom ratio greater than four. The zoom lens includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a negative refractive power. The second lens group is movable along the optical axis to vary the focal length and the third lens group is movable along the optical axis to maintain the image position constant. The fourth lens group is composed, in order, of a negative lens, a positive lens, at least one positive lens and at least one negative lens.

REFERENCES:
patent: Re28591 (1975-10-01), Nakamura
patent: 3615125 (1971-10-01), Higuchi et al.
patent: 4094586 (1978-06-01), Sato et al.
patent: 4110068 (1978-08-01), Ikamori

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