Fisheye lens

Details Fisheye lens Fisheye lens

2005-01-18

2005-01-18

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S752000, C359S753000

Reexamination Certificate

active

06844991

ABSTRACT:
An object of the present invention is to provide a fisheye lens, in spite of its compactness, having an angle of view of 180 degrees and a fast f-number of 2.8 with securing sufficient back focal length and suitable for a digital camera. The fisheye lens consists of a front lens group G1having negative refractive power and a rear lens group G2having positive refractive power locating with a space along the optical axis apart from the front lens group G1. The front lens group G1includes a plurality of negative lens components, L1and L2. The rear lens group G2includes at least one cemented lens L5, and given conditional expressions are satisfied.

REFERENCES:
patent: 4256373 (1981-03-01), Horimoto
patent: 51-2826 (1976-01-01), None
patent: 54-32319 (1979-03-01), None
patent: 2-248910 (1990-10-01), None
patent: 2000-356739 (2000-12-01), None

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