Telephoto zoom lens system having four lens groups

Details Telephoto zoom lens system having four lens groups Telephoto zoom lens system having four lens groups

1988-02-01

1989-07-18

Arnold, Bruce Y.

G02B 1514

Patent

active

048488836

ABSTRACT:
A four-group type telephoto lens system including a super-telephoto range having a viewing angle (2.omega.) of less than 8.degree. and which includes a focusing lens in a first lens group. The lens system includes for lens groups. The first group is composed of a first sub-part having a positive refractive power, a second sub-group having a negative refractive power, and a third sub-group having a positive refractive power. The second group has a negative refractive power, the third group a positive refractive power, and the fourth group a positive refractive power. Zooming is effected by moving the second group, while focusing is carried out by moving only the third sub-group of the first group.

REFERENCES:
patent: 4752121 (1988-06-01), Kitagishi

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