I forgot to do a tip for last Friday. Sorry.
I have a dedicated camera button on my phone. If I press and hold the camera button it will take me to the photo screen to take a picture or video. If the phone is locked or not it still takes you there so you can quickly get there to get your shot. Even if the phone is locked with a PIN it will take you to the app where you can ONLY take a photo or video, nothing else unless you supply your unlock PIN. FAST!