If you are a Hackaday reader, you probably know what a Fresnel lens is. You find them in everything from overhead projectors to VR headsets. While it seems commonplace now, the Fresnel lens was an ...

The Nikon AF-S 300mm f/4E PF ED VR, with its specialist phase fresnel element, is one of the most remarkable F-mount lenses ...

The most important thing to know about Fresnel lenses, before casually attempting to drop them into conversation, has to do with phonetics: "Fresnel" is pronounced "Fruh-NEL." If the silent "S" makes ...

Fresnel lenses consist of interspaced, concentric steps which correspond to the surface of a conventional lens. This equates to a lens with a common focal length, equivalent to a simple lens, but at ...

John Hill likens the first-order Fresnel lens in the lighthouse at Naval Air Station Pensacola to a fabergé egg. "They aren't made anymore. It is one of only 10 left in the U.S. There is no putting a ...

Germany's Astera has announced the introduction of its new Fresnel series of lights; the compact PlutoFresnel and the larger LeoFresnel. By developing LED lights specifically for integration with a ...

Fresnel lenses are all around us, but this vase puts the commonplace technology to work in an entirely new way. Borrowed From Old Lighthouses, A Method For Super-Powerful Solar Power With the help of ...

If you had an array of high power addressable LEDs, how would you project them onto a wall? Perhaps you’d use a Fresnel lens, or maybe an individual lens on the top of each. [Joo] faced this problem ...

Fresnel lenses consist of a flat surface with interspaced, concentric steps whereby each step corresponds to the surface of a conventional lens. Each step thereby acts as a refractive surface, much ...