Phones have largely plateaued in performance, as even budget smartphones have what it takes to serve an average user. As a result, most of the tangible differentiation we see on high-end smartphones these days is on the camera. Camera flagship phones focus on quality and versatility, and one of the tools they have adopted for the latter is a periscope zoom lens. But what exactly is a periscope lens, and how does it help your phone camera zoom? We explore this in this article.
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