New Huawei phone has a 5x optical zoom, thanks to a periscope lens | Ars Technica
KASE 3X Optical Zoom Telephoto Lens – Kase Lens USA
Phone Camera Lens Phone Lens for iPhone Samsung Pixel One Plus Huawei, 12x Telephoto Lens, HD External Camera Lens, Compatible With Most Mobile Phones On The Market - Walmart.com
Amazon.com: IKAAR Telephoto Lens Cell Phone Camera Lenses 20x Zoom Universal Wide Angle Telephoto Lens with Extendable Tripod, Compatible for Samsung Huawei Xiaomi und iPhone Black : Electronics
Metal Telescope Telephoto Lens 18 Zoom Clip Clamp For Smartphone Samsung Huawei | eBay
A peek inside the Huawei P30 Pro's periscope lens shows off its clever zoom - The Verge