I started using the action button for the camera, but this is not the best choice. It’s fine for opening the camera (I quite like that), but as a shutter it doesn’t work (for me). I find I put my finger too close to the lens and so it can sneak into photos, especially when used one handed. Plus, it’s just not a comfortable position. It would be better if a) the volume down was the action button. b) it was under the power button on the other side c) Maybe on the bottom left hand corner or top right hand corner for two handed use? I think I’m going to switch to using it with a shortcut, maybe some sort of quick capture system.