Ever since the iPhone 7 Plus arrived in 2016, dual-lens cameras have become one of the hottest mobile trends on the market. Several iPhone models carry the feature now, and they can also be found on many different Android devices from different companies.
Depending on the device, the two lenses on a dual-camera setup can have different functions. Some devices, such as the iPhone 7 Plus, iPhone 8 Plus, and iPhone X, have one wide-angle lens and one telephoto lens. The former allows for wider shots, while the latter allows for a sharper, optical zoom rather than the digital zoom found standard on most cameras.
Other devices, such as the Huawei Mate 10, have one RGB color lens and one monochrome lens. The former allows for greater depth and color accuracy in color photos and the latter allows for sharper and more detailed black-and-white photos.