It seems that the OnePlus 5 marketing promised more than the engineering team delivered - the chipset isn't as fast as benchmarks indicate and the camera's 2x optical lossless zoom isn't. No, really, it isn't optical or lossless, the camera isn't 20MP either. Co-founder Carl Pei clarified on Twitter that actually the second lens on the back offers 1.6x optical zoom then digital zoom makes up the remaining 0.4x to reach the claimed 2x. That final upscaling means that the effective resolution is less than 20MP - in reality, it's closer to 16MP. The company still claims "2x lossless zoom",...
Source: http://www.gsmarena.com/oneplus_5s_tele_camera_only_has_16x_optical_zoom_digital_zoom_brings_it_to_2x-news-25760.php
