Telephoto lens, telephoto lens system, and imaging system...

Details Telephoto lens, telephoto lens system, and imaging system... Telephoto lens, telephoto lens system, and imaging system...

2005-03-22

2008-08-05

Mack, Ricky L (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000, C359S772000

Reexamination Certificate

active

07408719

ABSTRACT:
The invention relates to a telephoto lens that can easily have high resolving power best suited for use with digital cameras and maintain the integrity of performance even at the nearest distance and a telephoto lens system that incorporates the same and is best suited for use with lens interchangeable digital cameras. The telephoto lens comprises, in order from its object side, a first lens group G1having positive refracting power, a second lens group G2, a third lens group G3having positive refracting power and a fourth lens group G4having negative refracting power. An aperture stop S is interposed between the second lens group G2and the fourth lens group G4, and the second lens group G2comprises a positive lens and a negative lens. Upon focusing from an infinite object point to the nearest object point, the second lens group G2moves in the optical axis direction, the third lens group G3moves toward the object side and the aperture stop S moves together with the third lens group G3while the space between adjacent lens groups changes.

REFERENCES:
patent: 4348084 (1982-09-01), Kitagishi et al.
patent: 5490014 (1996-02-01), Suzuki
patent: 5784676 (1998-07-01), Iseki et al.
patent: 6480341 (2002-11-01), Ohtake
patent: 6628462 (2003-09-01), Ogawa
patent: 61-214413 (1986-09-01), None
patent: 2000-089103 (2000-03-01), None
patent: 3-445554 (2003-06-01), None

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