- Photon is by far the best of the open source Android cam apps that I've tried, you just need to spend some time tweaking settings for optimal results - https://github.com/eszdman/PhotonCamera
There is also FreeDCam if you want a "pro style" app that lets you access all manual controls - https://github.com/KillerInk/FreeDcam
Other than those, running a Gcam mod is often the best solution - https://www.celsoazevedo.com/files/android/google-camera/