Sighting optics including an optical element having a first...

Details Sighting optics including an optical element having a first... Sighting optics including an optical element having a first...

2011-08-16

2011-08-16

Lavarias, Arnel C (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S574000, C042S111000

Reexamination Certificate

active

08000010

ABSTRACT:
Sighting optics include a front sight and a rear sight positioned in a spaced-apart relation. The rear sight includes an optical element having a first focal length and a second focal length. The first focal length is selected so that it is about equal to a distance separating the optical element and the front sight and the second focal length is selected so that it is about equal to a target distance. The optical element thus brings into simultaneous focus for a user images of the front sight and the target.

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