https://wccftech.com/download-google-camera-with-night-sight-mode-for-the-oneplus-6-and-6t/

One of the things we didn’t know about the Pixel 3 before its launch were some of its camera features. Google Camera‘s new Night Sight mode is yet to be released officially, but a version of the application exists with the functionality enabled. The feature was brought to life on the Pixel 3, Pixel 2, and Pixel before it was ported to other devices such as the Xiaomi Mi 5 and Essential Phone. Now, an XDA Developers user has managed to bring Google Camera with Night Sight and HDR+ to the OnePlus 6 and OnePlus 6T.

Night Sight can take pictures in almost any lighting, and the feature is similar to the night mode on the Huawei P20 and Mate 20 because it makes handheld long exposure shots feasible. A Night Sight picture has a lot more detail and shows more details compared to an HDR+ Enhanced picture taken in a similar environment. One can also see a lot more detail in areas that would be otherwise dark owing to ambient conditions.