Comment by efreak

At least in the past, 1st party cameras apps used private apis to treasure pictures using certain features of the camera, and 3rd party cameras were unable to take advantage of this without system signature. I'm not sure if this still holds true, but I do know that 1st party camera apps are still frequently the best available for specialized cameras. (I don't keep up with this because I'm not into photography--I'm happy with ability to focus on a bar code a few inches away, something my first Android phone and tablet couldn't do)