High resolution objective for large-format photography
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United States of America Patent
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Feb 22, 2000
Grant Date -
N/A
app pub date -
Dec 7, 1998
filing date -
Dec 10, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A high-resolution objective for large-format photography has a pair of positive meniscuses flanking a stop area forming a lens aperture; and a respective negative cemented doublet on a side of each meniscus turned away from the stop area, the positive meniscuses being composed of glass having anomalous partial dispersion, a refractive index n.sub.e <1.63 and a dispersion or Abbe number .nu..sub.e >63, the cemented doublets each having a negative lens element and a positive lens element, the negative lens element being composed of a lead-free, arsenic-free and antimony-free glass with an anomalous dispersion, a refractive index n.sub.e >1.63 and an Abbe number .nu..sub.e <50.
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Cited Art Landscape
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