God I gave up trying to use the camera from the lock screen because if you fail, it's slower than just unlocking it and using it from the main screen, which is itself pretty unreliably and slow. I wish there was a way to quickly and reliably take photos without constantly fighting the stupidly fragile UI. Back in the day, you could just press the shutter button on your camera and it would take a photo instantly, but somehow we've regressed and nobody cares. It eliminates a whole range of spontaneous photos.