New Huawei phone has a 5x optical zoom, thanks to a periscope lens

Here's the camera assembly for the Huawei P30 Pro and... wait, what? Is that a square camera lens? [credit:
Huawei ]




Huawei officially announced the Huawei P30 Pro smartphone today. While it has a new Huawei-made SoC, an in-screen optical fingerprint reader, and lots of other high-end features, the highlight is definitely the camera's optical zoom, which is up to a whopping 5x. Not digital zoom. Real, optical zoom.
On most high-end smartphones today, like the iPhone XS and Galaxy S10, you'll only ever get a 2X optical zoom. Usually, these exist in an entire second sensor and lens on the back of the phone, giving you a choice between the standard 1x lens or extra 2x lens. The reason you usually don't get large zoom multipliers in smartphones is because zoom lenses take space. Inside a zoom lens is a series of smaller lenses, some of which move inside the lens body to change the focal length. A larger distance between the lenses will get you a higher zoom multiplier, and on real cameras this can reach several feet long.
Space, of course, is at a premium in smartphones. Imagine a smartphone sitting face down, and you would have to fit a vertical stack of the display, the CMOS sensor, and the lens all in about an 8mm height. There is just not a lot of room.
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