Watch the video: What is focal length? Take two 50mm lenses: an f/1.8 and an f/1.2. Even though they both have the same 50mm focal length, they're not the same physical length – and neither of them is ...

Ever wonder why you may look prettier in some photos and uglier in others, even with the same smile and the same lighting? It’s all about the camera lens. These portraits—taken by Stephen ...

The main job of a lens is to concentrate (focus) light rays so the film or digital sensor can record the scene. Put simply, the distance it needs to make the light rays converge completely is called ...

You may or may not have heard, but lenses do more than just change the perspective of the scene you are looking at through your camera. That distortion and change in perspective also affects how a ...