![]() This phone has a 2x optical zoom, but a 10x digital zoom. ![]() Take the shot below from an iPhone Xs, for example. A long telephoto lens for a DSLR, like those you see sports photographers using at games, has a focal length of between 500-1,000mm. The optical zoom comes from lenses with long focal lengths that are at least relative to the camera’s sensor size. There’s no loss in quality-objects just appear closer. If you view the moon through one, it looks bigger. For example, a telescope is all optical zoom. Optical zoom is when the physical properties of a lens genuinely magnify distant objects. All you really need to know, though, is zoom depends on the underlying focal length of a lens and the size of the sensor-and that it’s a bit disconnected from reality.īut what’s the difference between optical and real zoom (I’ll keep using this word for the sake of convenience, but what I really mean is “apparent magnification” or “narrower relative field of view”)? How Optical Zoom Works ![]() If you want to know more, you can check out this piece on how zoom specs are calculated. The Huawei P40 Pro also has a periscope lens with a 5x optical zoom. Unlike with compact cameras, this means you can expect mostly the same rough magnification with different 10x-zoom smartphones. Smartphones like the iPhone 11 Pro add an even wider lens and call it a 0.5x zoom, rather than resetting 1x to the new widest angle. A 1x zoom is broadly accepted as the field of view of the main camera. Smartphone manufacturers, however, use zoom slightly differently. This meant a lens with 10x zoom didn’t necessarily make things look 10 times bigger. So, a 10mm-100mm lens had 10x zoom, while a 25mm-100mm lens had a 4x zoom. Originally, it was the ratio between the shortest and longest focal lengths of a lens. Zoom, as we use it now, is basically a marketing concept popularized by compact cameras. The marketing for the Huawei P40 Pro’s wide-angle lens claims it has a 0.6x optical zoom. There are enough factors at play that lenses aren’t sold based on how much they magnify objects rather, they’re sold based on their focal length.
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