The DxO One is a unique camera. Like the Sony QX cameras, it depends on a smartphone for its viewfinder/display and controls, but the One is iPhone-only and connects via the Lightning port rather than WiFi. For years, special guest Alex Lindsay has begged for camera manufacturers to decouple the optics and sensor from the user interface, allowing third parties to provide a variety of controllers to meet a variety of needs. The One doesn’t go quite that far — there’s no API for others to write controlling iPhone apps — but it delivers a much improved experience as compared to the Sonys.
The DxO One has a 1″ 20MP sensor and a 32mm (full-frame equivalent) f/1.8 lens with an adjustable (to f/11) aperture, shutter to 1/8000 second and ability to shoot to ISO 12,800 (normal mode), delivering image quality much improved over that of even the latest iPhones. Of interest to serious photographers will be that the One can capture RAW files as well as JPEGs. And if you don’t need to see the image while shooting, you can even use it without the iPhone. (The camera holds a microSD card.)
Some of the above images from the DxO One website.