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 ...

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The popular French lens design was originally created for lighthouses The popular French lens design was originally created for lighthouses is a senior editor and founding member of The Verge who ...

The Point San Luis Lighthouse’s original 4 th order lens has been around since 1878. The light no longer shines but is now on display at the top of Point San Luis. Cleaning a 144-year-old lens takes ...