Earlier quoted context omitted.
What do the 3 cameras do?
It doesn't really matter as long as it creates a sense of uniqueness for the consumer. Remember all these octo-cores smartphones that were supposed to perform way better than the two-cores smartphones? It's only there to tell you "3 cameras are better than 2" even though no one understands what it does. Same with cores : "wow 8 cores? 8 is such a big number compared to 2 cores therefore it must be way better/faster"
> “When I first heard that Huawei’s new flagship device was going to have three rear-facing cameras I was sceptical,” said Ben Wood, chief of research at CCS Insight. “But it feels like the company has added meaningful features rather than gimmicks, including the five-times telephoto zoom, excellent low light, long exposure performance and crisp black and white pictures the dedicated monochrome lens offers.”
https://www.theguardian.com/technology/2018/mar/27/huawei-p2...
> Huawei’s traditional setup of combining the data from a monochrome and a color sensor is still in place, but this time, the color sensor weighs in at a whopping 40 megapixels. You’ll have the option to use that entire resolution to take photos, though the default setting will be to combine the data from four adjacent pixels into one and thus generate clearer, brighter 10-megapixel shots. One of these quad-pixel pixels inside the P20 Pro measures in at 2µm, which is huge for a smartphone sensor. Google’s Pixel 2, for comparison, has 1.4µm pixels, while the regular P20, which has a 12-megapixel main sensor, comes with 1.55µm pixels.
https://www.theverge.com/2018/3/27/17165822/huawei-p20-pro-s...