The periscope zoom camera in the new Huawei P30 Pro (or the Oppo Reno) blows our mind. It feels like magic to have this power in a phone, and its mechanism is so simple that you have to wonder how the hell nobody came up with this before.

As this P30 Pro tear-down video by YouTuber JerryRigEverything shows, the periscope that allows this magic on Huawei’s camera phone is “just” an ingenious optical array of prisms and lenses.
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https://www.tomsguide.com/us/huawei-p30-pro-teardown-periscope-zoom,news-29919.html