DxO ONE

The DxO ONE from DxO Labs was a small camera that attached to an iPhone or iPad using the Lightning connector port. It was introduced in June 2015. The DxO ONE had a 1-inch format, 20.2 megapixel image sensor—the same one found in the Sony Cyber-shot DSC-RX100—and an f/1.8 maximum-aperture lens and high-speed shutter. The ONE used the attached mobile device as an electronic viewfinder for the camera, which did not have its own viewfinder.
It is similar to a lens-style camera, insofar as it was designed to be attached to a smartphone so that the phone’s screen could be used as the camera’s display. However, the DxO ONE is not shaped like a lens, and it is easier to use as a standalone camera because it has a low-resolution black-and-white screen that can display live view.
European Imaging and Sound Association awarded the DxO ONE its prize for photo innovation for 2015–2016. DxO also created a website where photographers can showcase images taken with the DxO ONE.
It was discontinued in 2018.

Specifications

20.2 megapixel 1-inch format BSI-CMOS image sensor
Records still images in JPEG, RAW, and SuperRAW formats
Metering modes: Auto, Program, Shutter-priority, Aperture-priority, and Manual
Scene modes: Sports, Landscape, Portrait, and Nighttime
Exposure compensation adjustment
ISO settings range from 100 to 12,800 plus 25,600 and 51,200 and Auto
Focus via contrast-detect Autofocus, with face-detection, or via the touchscreen on the connected mobile device
Video recording with single-channel audio in 1080p 30fps, or 720p 120fps for slow-motion
microSD card slot for recording images and videos
microUSB connector for charging and transferring images and videos to a computer

The DxO ONE included a SuperRAW image format that records raw images in quick succession for later post-processing. Temporal noise reduction was then performed on the set of images.
It could be rotated up to 60 degrees each way once connected via the Lightning connector. For capturing a Selfie, it could be reversed to face towards the user.

Requirements

The DxO ONE worked with iPads and iPhones running iOS 8 or later and that had a lightning connector. The DxO ONE could be used on its own, with its rear OLED screen allowing the user to switch between photo and video, but not to preview the image. This was later updated by firmware to allow the rear screen to be used as a framing assistant.
For desktop processing of raw and SuperRAW images, an Apple Mac or Windows computer was required. Images were transferred using a separate application, DxO Connect, via cable. Apple added support for processing DxO ONE raw files in Digital Camera Raw 6.17 and Adobe added support for them in Camera Raw 9.2.