High resolution objective for large-format photography

Details High resolution objective for large-format photography High resolution objective for large-format photography

1998-12-07

2000-02-22

Dang, Hung Xuan

Optical: systems and elements

Lens

Multiple component lenses

359754, 359756, 359771, 359781, 359782, G02B 962

Patent

active

060287209

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.

REFERENCES:
patent: 1777262 (1930-09-01), Hasselkus et al.
patent: 3302991 (1967-02-01), Bechtold
patent: 3592531 (1971-07-01), McCrobie
patent: 3817599 (1974-06-01), McCrobie

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