Optical system and optical apparatus having the same

Details Optical system and optical apparatus having the same Optical system and optical apparatus having the same

2009-08-18

2011-11-29

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S793000, C359S682000

Reexamination Certificate

active

08068289

ABSTRACT:
An optical system includes, in order from an enlargement conjugate side to a reduction conjugate side, a first lens unit having a negative refractive power and a second lens unit having a positive refractive power. In the optical system, an aperture stop is located closer to the reduction conjugate side than the first lens unit, one or more positive lenses are located closer to the reduction conjugate side than the aperture stop, and the one or more positive lenses include a P-th positive lens located closest to the reduction conjugate side. Various optical qualities may be appropriately set to effectively control chromatic aberration for the entire image plane, provide high optical performance, and achieve a wide angle of view.

REFERENCES:
patent: 7079324 (2006-07-01), Yamasaki
patent: 7173766 (2007-02-01), Kimura et al.
patent: 7426079 (2008-09-01), Yokoyama
patent: 06-082689 (1994-03-01), None
patent: 09-033801 (1997-02-01), None
patent: 2001-188171 (2001-07-01), None

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