http://www.physorg.com/news192299313.html
"The MicroSight, a disc smaller than a dime, brings both the target and the iron sight into simultaneous focus..."
"...whereas lenses focus light using refraction — essentially, changing the direction of light waves by changing their speed — zone plates use diffraction."
"The MicroSight gives you much of the performance you'd get out of a holographic or telescopic sight," says INL engineer David Crandall, who developed the technology. "But it's more reliable, much lighter-weight and much cheaper."
"The MicroSight... is tiny — its zone plate is thin and only about a quarter-inch in diameter — and relatively cheap. ...[T]he sight should cost significantly less than red-dot and telescopic sights when Apollo Optical Systems, which licensed the technology, takes it to market."
Incredible!
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