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 ...

Photography is full of fancy terms and complicated science, but we are here to explain it all to you in simpler terms. Today we are focusing on focal length. This term gets thrown around often, ...

Getting a great picture of another person, or even yourself, can be a tough process as there are so many variables to account for. One that's often neglected is focal length, or what essentially ...

The term ‘crop factor’ arose from a need to help 35mm film SLR photographers understand how their existing lenses would perform on cameras with smaller image sensors than traditional 35mm film. It’s ...

How to select the best focal length; Why wide-angle lenses?; Zoom or Prime?; Telephoto lenses; Focal length analysis; All the information you need to select the right lens for landscapes. A focal ...

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 ...

The Part 1 of this series about digital camera design has shown how to do the basic calculations that interrelate pixel size, focal length, focal ratio, and spot size, and demonstrated how these ...

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 ...