LG G4 Camera is quipped with the super fabulous manual mode which is capable of giving you DSLR like experience on your smartphone itself. In many ways the camera can be manually tuned as per your requirements whether be it in terms of Aperture control, white balance or manual focus.
Found this amazing video on how to use camera manual mode where all the steps to use the camera are aptly explained at https://youtu.be/AV5I5Au8eb0