Making a traditional glass lens requires a lot of experience, skill, and patience grinding a piece of glass to the required shape, and is not for the casual experimenter. Making a glass Fresnel ...

The first patent for a telescope was filed in 1608 ... While not useful for cameras, the fresnel lens came around this time in 1818 and saved hundreds if not thousands of ships.

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 ...

A new patent has revealed that Canon might be building an attachment for smartphones featuring a telephoto lens. The camera attachment is said to feature a telephoto lens. The telephoto lens and ...