A periscope camera lens is a lens assembly that uses prisms, mirrors, or a combination of them to redirect light before it reaches the camera sensor. In doing so, it magnifies the image more so than ...

SEATTLE—Primes are single focal length lenses, which can be designed with a relatively few optical elements and thus are capable of transmitting a lot of light to the film or digital camera sensor.

Whether you want to shoot a tennis match or take a close-up of a butterfly, you will need the right lens for the job. The primary differentiators among lenses are focal length (the distance at which ...