Here are some basics to know before choosing a lens. Focal length and angle of view Full frame and APS-C A-mounts and E-mounts Lens names and model numbers The focal length extends from the center of ...

The lens in a camera is like an eye that lets light into the camera body and focuses it on the sensor, where the image is recorded. The larger the optical components (known as ‘elements’) in the lens, ...

Although vision correction is the main reason that contact lenses are worn, contacts can also be worn for cosmetic reasons; to change eye colour, as part of a costume, or even to sharpen the vision of ...