https://www.cnet.com/news/galaxy-s10-plus-camera-hands-on/

We've seen super-wide lenses already in phones from LG and Huawei and I really like it. It's easy to toggle between the different views in Samsung's camera app and it's great for landscapes, cityscapes or any scene where there's a massive view you want to take in in its entirety. 

The standard 12-megapixel lens maintains the dual aperture we saw on the previous S9 Plus, which uses a wider aperture to let in more light, thereby hopefully resulting in better photos when the sun goes down.