Afocal Galilean attachment lens with high pupil magnification

Details Afocal Galilean attachment lens with high pupil magnification Afocal Galilean attachment lens with high pupil magnification

2009-04-27

2010-10-05

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

C359S744000

Reexamination Certificate

active

07808718

ABSTRACT:
An afocal Galilean attachment lens is disclosed, with the lens comprising, along an optical axis, a first lens group with overall negative optical power and a second lens group with overall positive power. The first and second lens groups are arranged to define a Galilean configuration. The lens also has exit and an entrance pupils with respective diameters DEXand DENthat define a pupil magnification PM=DEX/DEN>4and in some embodiments PM>10. The afocal Galilean attachment lens also has a length parameter defined LP>200 and in some embodiments LP>700. The extreme length of the afocal Galilean attachment allows for photographing or filming objects that are remote or otherwise hard to photograph while also providing a relatively large depth of field.

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patent: 6057971 (2000-05-01), Mihara
patent: 6307683 (2001-10-01), Miyano
patent: 198394 (2008-10-01), None

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