A video posted to Weibo shows off the camera module, which includes a periscope telephoto, two normal-looking lenses, and one much larger module that is presumably for the primary camera.
One of the big inclusions in Vivo’s Apex 2020 concept phone, which we weren’t able to see in person due to the COVID-19 pandemic, was “gimbal-like” stabilization on a 48-megapixel camera.
Other phones with periscope “zoom” lenses, like the Galaxy S20 Ultra, really just have long prime lenses and rely on software scaling to handle interim focal lengths.
The camera module says “16-135” below the lenses, which could just describe a periscope prime of 5x the focal length of a 27mm primary camera.
The GN1’s large physical size together with Vivo’s advanced stabilization tech could certainly explain the unusually big primary lens on the X50.