Zone focusing optical system

Details Zone focusing optical system Zone focusing optical system

G - Physics

03

B

95/63, 88/94.5

G03B 3/04 (2006.01) G02B 7/28 (2006.01)

Patent

CA 1133306

6187 ABSTRACT OF THE DISCLOSURE A compact zone focusing lens system is provided for use as a photographic camera objective. In the system, a positive meniscus lens is mounted in registration with the larger opening of a truncated, opaque, open-ended cone section the apical end of which serves as a maximum system aperture stop. A transparent disk having a plurality of meniscus lens elements integrally molded therein is mounted so that its lens elements can be selectively rotated into alignment with the cone section apical opening to provide system focal lengths which are appropriate for sharply focusing objects located within different object distance ranges.

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