In 2019 the Huawei P30 Pro and Oppo Reno 10x zoom kicked off a zoom arms race with the introduction of the periscope telephoto lens – or should we say “re-introduction”. One phone had a periscope several years ago and with a design that was more advanced than modern phones. Currently, you can get a periscope-equipped phones from Huawei, Oppo, Samsung, Xiaomi, vivo and Honor. But they have two major downsides. One, they have very long focal lengths (100+ mm). And two, they are locked at that focal length. This means that mid-range zoom requires either digital zoom with the main camera...
Source: https://www.gsmarena.com/flashback_periscope_zoom_cams_with_smooth_zoom_are_the_future_but_we_already_had_them-news-46880.php
