Optical: systems and elements – Lens – With variable magnification
Patent
1992-08-28
1994-11-15
Sikes, William L.
Optical: systems and elements
Lens
With variable magnification
359715, G02B 1514
Patent
active
053653769
ABSTRACT:
A zoom lens is disclosed, having, in order from the object side, a negative first lens unit, a negative or positive second lens unit, a positive or negative third lens unit and a fourth lens unit. The second and third lens units have refractive powers of opposite sign to each other. When zooming from the wide-angle side to the telephoto side, the first to fourth lens units move toward the object side, while simultaneously varying their lens separations.
REFERENCES:
patent: 4756609 (1988-07-01), Estelle
Canon Kabushiki Kaisha
Parsons David R.
Sikes William L.
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