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 Camp Snap is a simple fixed-focus digital camera with only an optical ... The viewfinder meanwhile uses a lens, a mirror, and a Fresnel lens, and if you think this might look a little familiar ...

The use of concentric rings on a flat lens isn't new — a precursor, called a Fresnel zone plate, tries to do the same trick but is unable to eradicate chromatic aberration. However, the Utah ...

Fujifilm was one of the first camera makers to embrace mirrorless systems and has one of the most well-established lens libraries. These are the best we've tested. Images, and the devices that ...