Chinese phonemaker Vivo has been pushing the limits of smartphone photography in the last few years. However, the availability of its phones — like last year’s X200 Ultra , with its beefy add-on telephoto — has been intermittent in the West. The company says the X300 Ultra its first global flagship launch, although there’s still no word on a US launch or pricing at the time of writing. Like the latest phones from Xiaomi and Oppo, Vivo is also obsessing over larger camera sensors, peripherals and a dizzying array of technical photography specs, with a particular focus on cinematic video recording. Collaborating with Zeiss again, the X300 Ultra features a “triple prime lens” camera system with 85, 35 and 14mm equivalent focal lengths. This can be punched up to 400mm equivalent with a new telephoto extender, the messily-named Zeiss Telephoto Extender Gen 2 Ultra, whose price is also unknown for now.…