Professional photographers talk a lot about the “Holy Trinity”: a wide-angle lens, a standard zoom, and a 200mm telephoto. Together, they cover basically every situation you’d encounter. Smartphones have gotten close over the years, but that 200mm end has always been out of reach. The OPPO Find X9 Ultra is OPPO’s attempt to finally close that gap, and the camera system it’s built to do it is genuinely unlike anything we’ve seen before. The headlining addition is a Hasselblad 50MP 10x Ultra-Sensing Optical-Zoom Telephoto. According to OPPO, it’s the world’s first 10x optical telephoto built on a 50MP sensor. To make it work, OPPO developed a Quintuple Prism Reflection Periscope Structure that uses five reflections to extend the optical path. That lets it shrink the module length by 30%, fitting into a 29mm-deep housing. Plus, an in-sensor crop pushes it further to an industry-first 20x optical-quality zoom. Five cameras, eight focal lengths The 10x telephoto is just one part of a five-camera system.…