Optical: systems and elements – Lens – Reverse telephoto
Patent
1997-10-10
1999-11-02
Epps, Georgia
Optical: systems and elements
Lens
Reverse telephoto
359558, 359740, 359793, G02B 1304
Patent
active
059781580
ABSTRACT:
The invention provides an inexpensive phototaking lens system comprising a reduced number of lenses, which makes use of a diffractive optical element to make correction for first-order longitudinal chromatic aberration and chromatic aberration of magnification, and eliminates higher-order chromatic aberrations of magnification produced in a wide-angle lens system. The phototaking lens system comprises a front group having negative power, an aperture stop and a rear group having positive power, with the rear group comprising at least one positive lens and a diffractive optical element having a diffractive surface D of positive power, and satisfies conditions for making good correction for chromatic aberrations produced at a refractive system with the diffractive optical element and conditions for making well-balanced correction for longitudinal chromatic aberration and chromatic aberration of magnification.
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Epps Georgia
Olympus Optical Co,. Ltd.
Schwartz Jordan M.
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