Compact varifocal lens system capable of macrophotography

Details Compact varifocal lens system capable of macrophotography Compact varifocal lens system capable of macrophotography

1975-12-19

1977-10-18

Clark, Conrad J.

350186, 350187, G01B 1518

Patent

active

040543714

ABSTRACT:
A compact varifocal lens system, such as a zoom lens assembly, is provided having a front focusing lens component of negative refractive power, a variator lens component of positive refractive power, a compensator lens component of negative refractive power and a master lens component. The lens assembly has a compact configuration and further, provides a highly desirable macrophotography capability. The macrophotography mode of operation can be effected by fixing one of the variator and compensator lens components, or by separating one of the variator and compensator lens components into positive and negative subcomponents with a predetermined relative positioning of the subcomponents to provide a close-up focusing.

REFERENCES:
patent: 3603669 (1971-09-01), Lai et al.
patent: 3655271 (1972-04-01), Suzuki
patent: 3661445 (1972-05-01), Someya
patent: 3912376 (1975-10-01), Ogura

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