What the hell does the telephoto lens on your phone do?

Welcome to TNW Basics, a collection of tips, guides, and advice on how to easily get the most out of your gadgets, apps, and other stuff. The days when your phone had a single camera on it are gone. Nowadays, it’s common to have several of them on the rear of a device, or, if you’re Nokia, many, many more. Thing is… why? What are they all there for? What do they do? Well, we’re here to answer that question. We’ve already looked at a time-of-flight (ToF) camera, but today we’re pondering something else commonly found on the back of your phone:…

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