What is a 2x Telephoto Lens for A telephoto lens has a long reach, allowing you to photograph a subject that is far away or magnifying the subject in your frame. Generally, a lens is considered “telephoto” if it has a focal length of 60mm or longer. 2x Telephoto Lens for Compatible with All Single and Dual-camera Phones? Including all iPhone models, Samsung Galaxy and Note, Google Pixel, Huawei, and more. The product includes a 2x telephoto lens, slideable clip, cleaning cloth, and silicone storage bag. Getting Closer 2x or 4x 2x Telephoto lens gets you closer for tighter, crispier shots without using the digital zoom. Optimized for dual-lens devices, you can achieve 2x optical zoom when mounted over a single-lens camera or main lens of a dual-lens, and 4x optical zoom when mounted over the iPhone telephoto lens.