Vivo's new 400mm teleconverter lens shows rivals Oppo and Apple how it's done

<p>As Cameras Editor, Tim looks after all camera content at TechRadar. This includes news, reviews, features and buying guides, and covers anything from mirrorless cameras to film and smartphones. He loves observing the advances in camera technology, putting the latest and greatest cameras through their paces, and projecting where cameras could go next.