Telephoto zoom lens

Details Telephoto zoom lens Telephoto zoom lens

1987-10-30

1989-06-20

Arnold, Bruce Y.

350450, G02B 1516, G02B 964

Patent

active

048404691

ABSTRACT:
A telephoto zoom lens comprising, in succession from the object side, 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, the lens groups being moved independently of each other during zooming. The telephoto zoom lens meets certain conditions, including a condition that prescribes the amount of change in spacing between the first and second lens groups by zooming, so that the spacing increases at the telephoto end. The telephoto ratio is large, and the lens is relatively compact at the wide angle end. The burden borne by each lens group regarding correction of spherical aberration is reduced, and correction of spherical aberration is relatively easy, so that the degree of freedom in lens design is enhanced.

REFERENCES:
patent: 4729643 (1988-03-01), Kawaguchi et al.

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