A telephoto camera is a type of camera that allows you to take close-up pictures of subjects that are far away. It uses special lenses to make distant objects appear bigger and closer in your photos. Full definition
The 5's camera is identical to those of the Oppo R11, combining a 16 - megapixel f / 1.7 standard camera with a 20 - megapixel telephoto camera with f / 2.6 aperture. (androidcentral.com)
On the other hand, the secondary telephoto cameras on the iPhone X and the Note 8 are genuinely useful. (theverge.com)
On the other hand, the iPhone X has a 12 - megapixel primary camera with wide - angle f / 1.8 OIS lens and a 12 - megapixel telephoto camera with f / 2.4 OIS lens. (ibtimes.com)