Camera incorporating a zoom lens

Details Camera incorporating a zoom lens Camera incorporating a zoom lens

1990-02-26

1992-01-07

Perkey, W. B.

Optical: systems and elements

Prism

With reflecting surface

354270, 359694, 359740, G03B 500, G03B 700, G03B 908, G03B 1514

Patent

active

050795759

ABSTRACT:
When a lens system is focussed at a fixed length, what range of an object is clearly photographed is determined by the focal length and F number of the lens. In order that a zoom lens which requires no focussing operation is mounted on the beginners' camera to make the focussing range as wide as possible, the focussing position need be deviated as the focal length f varies as zooming takes place. If F number is selected in the range of F.gtoreq.2.8.times.10.sup.-3 .times.f.sup.2, a performance camera can be realized with a zoom lens including a wide angle and having a variable power ratio of the order of 2.

REFERENCES:
patent: 4043642 (1977-08-01), Hirose et al.
patent: 4141636 (1979-02-01), Shimojima
patent: 4865433 (1989-09-01), Okajima et al.
patent: 4980711 (1990-12-01), Komatsuzaki et al.

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